Co-reporter:Kai Zhu, Shaohua Guo, Qi Li, Yingjin Wei, Gang Chen, and Haoshen Zhou
ACS Applied Materials & Interfaces October 11, 2017 Volume 9(Issue 40) pp:34909-34909
Publication Date(Web):September 22, 2017
DOI:10.1021/acsami.7b09658
Layered oxides based on abundant elements have been extensively studied as cathodes of sodium-ion batteries. Among them, birnessite-type sodium manganese oxide containing lattice water meets the low-cost and high-performance requirement for stationary batteries. Herein, we for the first time present the controllable states of lattice water via adjusting the cutoff voltages, effectively enhancing the reversible capacity, cycling stability, and rate ability of the materials. The current investigation not only highlights the significance of intercalated lattice water for reversible Na (de)insertion of birnessite as well as other similar compounds, but also opens up new opportunities for advanced cathode materials for sodium storage.Keywords: cut-off voltage; lattice water; layered oxide; sodium-ion battery;
Co-reporter:Jin Yi, Yang Liu, Yu Qiao, Ping He, and Haoshen Zhou
ACS Energy Letters June 9, 2017 Volume 2(Issue 6) pp:1378-1378
Publication Date(Web):May 8, 2017
DOI:10.1021/acsenergylett.7b00292
With the increasing demands of electric vehicle and grid storage, the solid-state Li–O2 battery is generally considered as an alternative cost-effective energy-storage device because of its high energy density and safety. However, there are several challenges that need to be overcome to meet the stringent requirements imposed by diverse applications, especially at high temperature. In this work, an ion-conducting hybrid solid electrolyte (HSE) integrating polymer electrolyte with ceramic electrolyte (1:1 w/w) has been successfully designed and prepared, which displays high Li+ transference number (0.75) and ionic conductivity (0.32 mS cm–1) at room temperature. The solid-state Li–O2 battery enabled by the as-prepared HSE delivers a superior long life (350 cycles, >145 days) at 50 °C to that of the conventional ether-based nonaqueous Li–O2 battery. The use of a HSE could lead to a new avenue for the development of high-performance solid-state Li–O2 batteries.
Co-reporter:Ningning FengXiaowei Mu, Xueping Zhang, Ping He, Haoshen Zhou
ACS Applied Materials & Interfaces February 1, 2017 Volume 9(Issue 4) pp:
Publication Date(Web):January 12, 2017
DOI:10.1021/acsami.6b14889
Aprotic Li–O2 batteries have attracted worldwide interest owing to their ultrahigh theoretical energy density. However, the practical Li–O2 batteries still suffer from high charge overpotential and low energy efficiency resulting from the sluggish kinetics in electrochemically oxidizing the insulating lithium peroxide (Li2O2). Recently, dissolved redox mediators in the electrolyte have enabled the effective catalytic oxidation of Li2O2 at the liquid–solid interface. Here, we report that the incorporation of N-methylphenothiazine (MPT), as a redox shuttle in Li–O2 batteries, provides a dramatic reduction in charge overpotential to 0.67 V and an improved round-trip efficiency close to 76%. Moreover, the efficacy of MPT in Li–O2 cells was further investigated by various characterizations. On charging, MPT+ cations are first generated electrochemically at the cathode surface and subsequently oxidize the solid discharge products Li2O2 through a chemical reaction. Furthermore, the presence of MPT has been demonstrated to improve the cycling stability of the cells and suppress side reactions arising from carbon and electrolytes at high potentials.Keywords: charge overpotential; chemical oxidation of Li2O2; dissolved redox mediators; liquid−solid interface; lithium−oxygen batteries; N-methylphenothiazine;
Co-reporter:Jin Yi;Shaohua Guo;Ping He
Energy & Environmental Science (2008-Present) 2017 vol. 10(Issue 4) pp:860-884
Publication Date(Web):2017/04/12
DOI:10.1039/C6EE03499C
Li–air batteries have drawn considerable attention due to their high energy density and promising implementation in long-range electric vehicle and wearable electronic devices. Nevertheless, safety concerns, mainly derived from the use of flammable organic liquid electrolytes, have become a major bottleneck to the strategically crucial applications of Li–air batteries. Polymer electrolytes with non-toxicity, low vapor pressure, and non-flammable properties provide a feasible solution to safety issues through the replacement of organic liquid electrolytes, although fundamental understanding of polymer electrolytes for Li–air batteries is still insufficient. Accordingly, substantial research efforts have been devoted to achieving next-generation solid-state Li–air batteries with polymer electrolytes. Herein, we provide a specific review on the development of polymer electrolytes for Li–O2 (air) batteries, from comprehensive insight to emerging horizons, especially in understanding the underpinning chemistry and electrochemistry that govern the properties of polymer electrolytes for the solid-state lithium–air batteries. The discussion will highlight the recent progress in and challenges associated with polymer electrolytes for Li–O2 (air) batteries, as well as corresponding strategic perspectives.
Co-reporter:Yu Qiao;Shichao Wu;Jin Yi;Yang Sun;Shaohua Guo;Sixie Yang;Ping He; Haoshen Zhou
Angewandte Chemie 2017 Volume 129(Issue 18) pp:5042-5046
Publication Date(Web):2017/04/24
DOI:10.1002/ange.201611122
AbstractThe development of aprotic Li-O2 batteries, which are promising candidates for high gravimetric energy storage devices, is severely limited by superoxide-related parasitic reactions and large voltage hysteresis. The fundamental reaction pathway of the aprotic Li-O2 battery can be altered by the addition of water, which changes the discharge intermediate from superoxide (O2−) to hydroperoxide (HO2−). The new mechanism involving HO2− intermediate realizes the two-electron transfer through a single step, which significantly suppresses the superoxide-related side reactions. Moreover, addition of water also triggers a solution-based pathway that effectively reduces the voltage hysteresis. These discoveries offer a possible solution for desirable Li-O2 batteries free of aggressive superoxide species, highlighting the design strategy of modifying the reaction pathway for Li-O2 electrochemistry.
Co-reporter:Qi Li;Shaohua Guo;Kai Zhu;Kezhu Jiang;Xiaoyu Zhang;Ping He
Advanced Energy Materials 2017 Volume 7(Issue 21) pp:
Publication Date(Web):2017/11/01
DOI:10.1002/aenm.201700361
AbstractSodium-ion batteries are intensively investigated for large-scale energy storage due to the favorable sodium availability. However, the anode materials have encountered numerous problems, such as insufficient cycling performance, dissatisfactory capacity, and low safety. Here, a novel post-spinel anode material, i.e., single-crystalline NaVSnO4, is presented with the confined 1D channels and the shortest diffusion path. This material delivers an ultra long cycling life (84% capacity retention after 10 000 cycles), a high discharging capacity (163 mA h g−1), and a safe average potential of 0.84 V. Results indicate that the post-spinel structure is well maintained over 10 000 cycles, surprisingly, with 0.9% volume change, the Sn4+/Sn2+ based redox enables two sodium ions for reversible release and uptake, and the diffusion coefficient of sodium ions is characterized by 1.26 × 10−11 cm2 s−1. The findings of this study provide a new insight into design of new frameworks with polyelectronic transfers for full performance electrode materials of sodium-ion batteries.
Co-reporter:Han Deng, Feilong Qiu, Xiang Li, Hu Qin, Shiyong Zhao, Ping He, Haoshen Zhou
Electrochemistry Communications 2017 Volume 78(Volume 78) pp:
Publication Date(Web):1 May 2017
DOI:10.1016/j.elecom.2017.03.010
•A scalable high energy ball milling method was proposed to fabricate Li-Si alloy.•Li21Si5 alloy showed a pre-delithiation capacity of 1118.0 mAh·g− 1.•Li-ion O2 battery with Li-Si anode and Pt-CNT cathode achieves 80 stable cyclesLi-O2 battery is the leading next-generation battery system, which is known for its extremely high theoretic specific energy. However, the Li metal used in Li-O2 batteries suffers from low Li utilization and safety hazards. In this work, as an alternative to Li anode, Li21Si5 powders, which are synthesized by an easy mechanical process, are incorporated into a Li-ion oxygen battery. The electrochemical property of the prepared battery and its cycling stability are investigated. Without electrochemical prelithiation, the pursuit of Li-Si alloy anodes in this study provides an easy and scalable strategy for preparing Li-ion oxygen batteries.Download high-res image (274KB)Download full-size image
Co-reporter:Tao Zhang, Kaiming Liao, Ping He and Haoshen Zhou
Energy & Environmental Science 2016 vol. 9(Issue 3) pp:1024-1030
Publication Date(Web):21 Dec 2015
DOI:10.1039/C5EE02803E
Redox mediators (RMs) have become focal points in rechargeable Li–O2 battery research to reduce overpotentials in oxygen evolution (charge) reactions. In this study, we found an evidence for the shuttle effect arising in dimethyl sulfoxide (DMSO) with a LiI RM through the visual observation of the diffusion of soluble I3− towards a Li anode where it reacted chemically to produce LiI, which can be only partly dissolved, leading to the loss of both the RM and electrical energy efficiency. Therefore, we proposed a self-defense redox mediator (SDRM) of InI3 to counter this problem. During charging, the In3+ is reduced electrochemically on the Li anode prior to Li+, forming a much stable indium layer to resist the synchronous attack by the soluble I3−. The pre-deposited indium layer can also reduce the growth of dendrites from the Li anode surface. As a result, the electrical energy efficiency and the cycling performance of the Li–O2 cells were improved significantly.
Co-reporter:Sixie Yang, Ping He and Haoshen Zhou
Energy & Environmental Science 2016 vol. 9(Issue 5) pp:1650-1654
Publication Date(Web):29 Mar 2016
DOI:10.1039/C6EE00004E
As energy storage systems with great prospects, both Li–air and Li–CO2 batteries possess low energy efficiency and poor cycle performance, which is caused by the accumulation of Li2CO3 during cycling. Therefore, the complete electrochemical decomposition of Li2CO3 during charging will greatly improve the performance of Li–air and Li–CO2 batteries. However, our understanding of the electrochemical decomposition mechanism of Li2CO3 is very limited. In this work, we report that CO2 is released during the electrochemical decomposition of Li2CO3 while O2 is not detected throughout the whole process. Mass spectra and FTIR results show that the electrolyte solvent undergoes degradation during charging. We further demonstrate that this degradation is caused by superoxide radicals, which are generated from Li2CO3.
Co-reporter:Yarong Wang and Haoshen Zhou
Energy & Environmental Science 2016 vol. 9(Issue 7) pp:2267-2272
Publication Date(Web):03 Jun 2016
DOI:10.1039/C6EE00902F
Deep eutectic systems with self-contained electroactive species have been recognized in this work as a distinct class of low-cost greener catholytes or anolytes that potentially have high concentration of electroactive species, hence high volumetric capacities. The viability of the concept was demonstrated by applying a new deep eutectic catholyte (DEC) in a proof-of-concept Li-DEC battery.
Co-reporter:Zhiping Song;Yumin Qian;Minoru Otani
Advanced Energy Materials 2016 Volume 6( Issue 7) pp:
Publication Date(Web):
DOI:10.1002/aenm.201501780
Similar to Li–S batteries, Li–organic batteries have also been plagued by the dissolution of active materials and the resulting shuttle effect for many years. An effective strategy to eliminate the shuttle effect is adopting solid electrolytes or Li–ion permselective separators to prohibit the dissolved electroactive species from migrating to the Li anode. A polypropylene/Nafion/polypropylene (PNP) sandwich-type separator is reported with many advantages in comparison with previously reported LISICON, polymer electrolyte, and other Nafion utilization forms. The physical and chemical properties of PNP separators are studied in detail by cross-section scanning electron microscopy (SEM), infrared spectroscopy (IR), and electrochemical impedance spectroscopy. 1,1′-Iminodianthraquinone (IDAQ), a novel organic cathode, is taken as an example to quantitatively investigate the function of PNP separators. In the presence of PNP5 with the most appropriate Nafion loading of 0.5 mg cm–2, IDAQ is able to achieve dramatically improved cycling stability with capacity retention of 76% after 400 cycles and Coulombic efficiency above 99.6%, which reaches the highest level for reported soluble organic electrode materials. Besides Li–organic batteries, such kind of Nafion-based sandwich-type separators are also promising for Li–S batteries and other new battery designs involving dissolved electroactive species.
Co-reporter:Ningning Feng;Ping He
Advanced Energy Materials 2016 Volume 6( Issue 9) pp:
Publication Date(Web):
DOI:10.1002/aenm.201502303
Rechargeable aprotic Li–O2 batteries are one of the most promising next-generation battery technologies that can deliver extremely high energy density. In the past decades, this technology has attracted worldwide attention, and considerable progress has been achieved. However, numerous critical scientific challenges remain to be solved for practical applications. A specific discussion of recent progress from the perspective of the stable aprotic Li–O2 system with high energy efficiency is presented. The discussion is highlighted on the reaction mechanisms on air cathode, stability of cell components in semi-open surroundings, and improvement of battery performance by catalyst design. Challenges and perspectives are also presented. This study provides an intensive understanding of aprotic Li–O2 batteries and offers an important guideline for developing reversible and high-efficiency Li–O2 batteries.
Co-reporter:Shichao Wu;Jing Tang;Fujun Li;Xizheng Liu;Yusuke Yamauchi;Masayoshi Ishida
Advanced Functional Materials 2016 Volume 26( Issue 19) pp:3291-3298
Publication Date(Web):
DOI:10.1002/adfm.201505420
Moisture in air is a major obstacle for realizing practical lithium-air batteries. Here, we integrate a hydrophobic ionic liquid (IL)-based electrolyte and a cathode composed of electrolytic manganese dioxide and ruthenium oxide supported on Super P (carbon black) to construct a promising system for Li-O2 battery that can be sustained in humid atmosphere (RH: 51%). A high discharge potential of 2.94 V and low charge potential of 3.34 V for 218 cycles are achieved. The outstanding performance is attributed to the synergistic effect of the unique hydrophobic IL-based electrolyte and the composite cathode. This is the first time that such excellent performance is achieved in humid O2 atmosphere and these results are believed to facilitate the realization of practical lithium-air batteries.
Co-reporter:Kaiming Liao, Peng Mao, Na Li, Min Han, Jin Yi, Ping He, Yang Sun and Haoshen Zhou
Journal of Materials Chemistry A 2016 vol. 4(Issue 15) pp:5406-5409
Publication Date(Web):08 Mar 2016
DOI:10.1039/C6TA00054A
One of the most vexing challenges in Li–S batteries is the polysulfide shuttle. Using a combined theoretical and experimental approach, we show that g-C3N4 coated carbon can provide effective anchoring sites for lithium polysulfides, potentially having implications for the design of electrodes for practical Li–S batteries.
Co-reporter:Yang Liu, Na Li, Kaiming Liao, Qi Li, Masayoshi Ishida and Haoshen Zhou
Journal of Materials Chemistry A 2016 vol. 4(Issue 32) pp:12411-12415
Publication Date(Web):16 Jun 2016
DOI:10.1039/C6TA03583C
We here demonstrate an unmediated photoelectrochemical oxidation approach to address the overpotential issue of Li–O2 batteries during the charge process. We show that photoexcited holes from the photoelectrode provide a direct oxidation of solid Li2O2, without the use of a redox mediator. The Li–O2 battery composed of carbon nitride on carbon paper as a cathode and also as a photoelectrode exhibits an ultralow charge voltage of 1.96 V resulting in a ‘negative’ overpotential and good cycling performance. These results could represent a new and promising avenue for the future development of photo-charging all-solid-state batteries.
Co-reporter:Feilong Qiu, Ping He, Jie Jiang, Xueping Zhang, Shengfu Tong and Haoshen Zhou
Chemical Communications 2016 vol. 52(Issue 13) pp:2713-2716
Publication Date(Web):04 Jan 2016
DOI:10.1039/C5CC09034B
Ordered mesoporous TiC–C (OMTC) composites were prepared and served as catalysts for nonaqueous Li–O2 batteries. The OMTC cathodes showed high specific capacity, low overpotential and good cyclability. Furthermore, the reaction mechanism of Li–O2 batteries during charge and discharge processes was investigated extensively by XRD, XPS and in situ GC-MS methods.
Co-reporter:Jing Ye, Yi-xuan Li, Li Zhang, Xue-ping Zhang, Min Han, Ping He, and Hao-shen Zhou
ACS Applied Materials & Interfaces 2016 Volume 8(Issue 1) pp:208
Publication Date(Web):December 14, 2015
DOI:10.1021/acsami.5b08349
The cathode materials of Li-ion batteries for electric vehicles require not only a large gravimetric capacity but also a high volumetric capacity. A new Li-rich layered oxide cathode with superior capacity, Li[Li0.20Ni0.16Co0.10Mn0.54]O2 (denoted as LNCM), is synthesized from precursor, a coprecipitated spherical metal hydroxide. The preparation technology of precursor such as stirring speed, concentration of metal solution, and reaction time are regulated elaborately. The final product LNCM shows a well-ordered, hexagonal-layer structure, as confirmed by Rietveld refinement of X-ray diffraction pattern. The particle size of the final product has an average diameter of about 10 μm, and the corresponding tap density is about 2.25 g cm–3. Electrochemical measurements indicate that as-prepared LNCM has great initial columbic efficiency, reversible capacity, and cycling stability, with specific discharge capacities of 278 and 201 mAh g–1 at 0.03 and 0.5 C rates, respectively. Cycling at 0.1 C, LNCM delivers a discharge capacity of 226 mAh g–1 with 95% retention capacity after 50 cycles. Si/LNCM cell is fabricated using Si submicroparticle as anode against LNCM. The cell can exhibit a specific energy of 590 Wh kg–1 based on the total weight of cathode and anode materials.Keywords: coprecipitation method; lithium-ion battery; lithium-rich layered oxide; silicon anode; spherical cathode
Co-reporter:Jie Jiang, Han Deng, Xiang Li, Shengfu Tong, Ping He, and Haoshen Zhou
ACS Applied Materials & Interfaces 2016 Volume 8(Issue 16) pp:10375
Publication Date(Web):March 31, 2016
DOI:10.1021/acsami.6b02586
Li–O2 batteries have attracted extensive attention recently due to the extremely huge specific energy. Similar to research mode of Li-ion batteries, nowadays specific capacity based on the mass of cathode material is widely adopted to evaluate the electrochemical performance of Li–O2 batteries. However, the prerequisite of linear correlation between the delivered capacity and active mass is easily neglected. In this paper, we demonstrate the rationality of specific capacity adopted in Li-ion batteries with classic LiCoO2 cathode by confirming the linear correlation between cell capacity and LiCoO2 mass. Delivered capacities of Li–O2 batteries with different cathode masses are simultaneously measured and nonlinear correlation is obtained. The discharge and charge products are identified by X-ray diffraction and in situ gas chromatography-mass spectrometry analysis to ensure reaction mechanism. Discharge capacities of Li–O2 batteries with various areas of oxygen window are further studied, which shows that cell capacity increases linearly with the area of oxygen window. Scanning electron microscopy is employed to observe the discharged electrode and shows that Li2O2 deposition during discharge mainly occurs in the electrode area exposure to the oxygen, which is consequently defined as effective area for accommodating Li2O2. Moreover, a plausible route for formation of effective area in the oxygen electrode is proposed. These results provide evidence that effective area is an equally important factor determining cell capacity.Keywords: cell capacity; effective area; lithium−oxygen battery; oxygen diffusion; oxygen electrode
Co-reporter:Yong Lu, Shengfu Tong, Feilong Qiu, Jie Jiang, Ningning Feng, Xueping Zhang, Ping He, Haoshen Zhou
Journal of Power Sources 2016 Volume 329() pp:525-529
Publication Date(Web):15 October 2016
DOI:10.1016/j.jpowsour.2016.08.117
•Quantitative assays were introduced into aprotic Li-O2 batteries.•We detected the existence of LiO2 by EQCM in TEGDME electrolyte.•LiO2 was proved to be the reaction intermediate with high solubility.•Li2O2 formed through two-step electrochemical reactions during ORR processes.•We firstly confirmed Li2O2 decomposed to LiO2 at relative negative potential.We confirmed the existence of LiO2 by electrochemical quartz crystal microbalance (EQCM) in TEGDME based Li-O2 batteries. Our results indicated that Li2O2 is generated through stepwise electrochemical reactions rather than disproportionation. We report for the first time that the formed Li2O2 oxidizes to LiO2 at relative negative potential and O2 at positive potential respectively. Our conclusions were based on both experimental observations and quantitative analysis. This may enlighten us to reconsider the Li-O2 batteries mechanisms in a quantitative way.
Co-reporter:Kaiming Liao, Xuebin Wang, Yang Sun, Daiming Tang, Min Han, Ping He, Xiangfen Jiang, Tao Zhang and Haoshen Zhou
Energy & Environmental Science 2015 vol. 8(Issue 7) pp:1992-1997
Publication Date(Web):01 Jun 2015
DOI:10.1039/C5EE01451D
A two-dimensional conducting oxide nanosheet, which was prepared by a two-step process involving exfoliation and heat treatment, was employed as a Li–O2 cathode without adding any conductive additives. The 2D nanostructures in the Li–O2 cathode can provide a large surface-to-mass ratio, increase the electrode–electrolyte contact area and facilitate oxygen diffusion and electron transmission. The as-synthesized conducting oxide nanosheet of RuO2 enables the Li–O2 cathode to be operated under full discharge–charge conditions, and to deliver a high specific capacity of ∼900 mA h g−1 with stable discharge–charge overpotentials (0.15/0.59 V) over 50 cycles.
Co-reporter:Yang Liu, Na Li, Shichao Wu, Kaiming Liao, Kai Zhu, Jin Yi and Haoshen Zhou
Energy & Environmental Science 2015 vol. 8(Issue 9) pp:2664-2667
Publication Date(Web):18 Aug 2015
DOI:10.1039/C5EE01958C
We here present a photoassisted rechargeable Li–O2 battery by integrating a g-C3N4 photocatalyst to address the overpotential issue of conventional non-aqueous Li–O2 batteries. The high charging overpotential of a Li–O2 battery is compensated by the photovoltage, and finally an ultralow charging voltage of 1.9 V is achieved, which is much lower than that of any other conventional non-aqueous Li–O2 batteries. It is also worth noting that the charging voltage is even much lower than the discharging voltage (∼2.7 V), resulting in 142% energy efficiency (output electric energy/input electric energy, not including solar energy).
Co-reporter:Xizheng Liu, De Li, Songyan Bai and Haoshen Zhou
Journal of Materials Chemistry A 2015 vol. 3(Issue 30) pp:15403-15407
Publication Date(Web):09 Jul 2015
DOI:10.1039/C5TA04342E
With the exponentially growing utilization of lithium ion batteries (LIBs), their manufacture and recycling technologies with low cost and low pollution emissions are drawing increasing attention. Herein, we proposed an intelligent battery architecture design with a Magnetic-Manipulated Electrode (MME) by exploiting magnetic Fe3O4 particles as binder. It greatly simplifies the LIB fabrication and recycling technologies, and decreases the total cost as well. In addition, a battery equipped with MME shows anti-vibration and non-fatigue performance.
Co-reporter:Shichao Wu, Jing Tang, Fujun Li, Xizheng Liu and Haoshen Zhou
Chemical Communications 2015 vol. 51(Issue 94) pp:16860-16863
Publication Date(Web):21 Sep 2015
DOI:10.1039/C5CC06370A
High charge overpotentials are a great challenge for the realization of lithium–oxygen batteries. Here, we construct a Li–O2 battery system by introducing a limited amount of water into tetraglyme based electrolytes and electrolytic MnO2 (EMD) and Ru supported on Super P as cathodes for Li–O2 batteries. This results in low charge potentials of around 3.2 V, corresponding to overpotentials of 0.24 V, and outstanding rate capability and cycling performance.
Co-reporter:Shengfu Tong, Mingbo Zheng, Yong Lu, Zixia Lin, Xueping Zhang, Ping He and Haoshen Zhou
Chemical Communications 2015 vol. 51(Issue 34) pp:7302-7304
Publication Date(Web):16 Mar 2015
DOI:10.1039/C5CC01114K
Network structured carbonized bacterial cellulose-supported Ru nanoparticles (CBC/Ru), which provide sufficient space for Li2O2 deposition without a significant volume effect and improve the transport of oxygen and electrons, were used as the binder-free oxygen electrode in a Li–O2 battery. The CBC/Ru exhibited high activities and good stability during discharge–recharge processes.
Co-reporter:Yijie Liu, Bojie Li, Hirokazu Kitaura, Xueping Zhang, Min Han, Ping He, and Haoshen Zhou
ACS Applied Materials & Interfaces 2015 Volume 7(Issue 31) pp:17307
Publication Date(Web):July 15, 2015
DOI:10.1021/acsami.5b04409
The all-solid-state Li–air battery has been fabricated, which is constructed by a lithium foil anode, a NASICON-type solid state electrolyte Li1+xAlyGe2–y(PO4)3 (LAGP) and single-walled carbon nanotubes (SWCNTs)/LAGP nanoparticles composite as air electrode. Its electrochemical performance was investigated in air atmosphere. Particularly, this battery exhibited a larger capacity about 2800 mAh g–1 for the first cycle, while comparatively the battery with multiwalled carbon nanotubes (MWCNTs)/LAGP as cathode had a capacity of only about 1700 mAh g–1. Also, the battery with SWCNTs/LAGP showed improved cycling performance with a reversible capacity of 1000 mAh g–1 at a current density of 200 mA g–1. Our result demonstrated that the all-solid-state Li–air battery with SWCNTs/LAGP as cathode catalyst has a considerable potential for practical application.Keywords: air electrode catalyst; all-solid-state; Li−air batteries; solid-state electrolyte; SWCNTs
Co-reporter:Ningning Feng;Dr. Ping He;Dr. Haoshen Zhou
ChemSusChem 2015 Volume 8( Issue 4) pp:600-602
Publication Date(Web):
DOI:10.1002/cssc.201403338
Abstract
We show that by using a suitable soluble redox mediator, the charging overpotential can be reduced and the round-trip efficiency can be improved in an aprotic Li–O2 battery. Not only do we explore a new redox couple, 10-methyl-10H-phenothiazine, as a soluble catalyst that improves the electrochemical performance, but we also propose possible challenges that need to be overcome for the future improvement of aprotic Li–O2 batteries.
Co-reporter:Kaiming Liao, Peng Mao, Na Li, Min Han, Jin Yi, Ping He, Yang Sun and Haoshen Zhou
Journal of Materials Chemistry A 2016 - vol. 4(Issue 15) pp:NaN5409-5409
Publication Date(Web):2016/03/08
DOI:10.1039/C6TA00054A
One of the most vexing challenges in Li–S batteries is the polysulfide shuttle. Using a combined theoretical and experimental approach, we show that g-C3N4 coated carbon can provide effective anchoring sites for lithium polysulfides, potentially having implications for the design of electrodes for practical Li–S batteries.
Co-reporter:Yang Liu, Na Li, Kaiming Liao, Qi Li, Masayoshi Ishida and Haoshen Zhou
Journal of Materials Chemistry A 2016 - vol. 4(Issue 32) pp:NaN12415-12415
Publication Date(Web):2016/06/16
DOI:10.1039/C6TA03583C
We here demonstrate an unmediated photoelectrochemical oxidation approach to address the overpotential issue of Li–O2 batteries during the charge process. We show that photoexcited holes from the photoelectrode provide a direct oxidation of solid Li2O2, without the use of a redox mediator. The Li–O2 battery composed of carbon nitride on carbon paper as a cathode and also as a photoelectrode exhibits an ultralow charge voltage of 1.96 V resulting in a ‘negative’ overpotential and good cycling performance. These results could represent a new and promising avenue for the future development of photo-charging all-solid-state batteries.
Co-reporter:Shichao Wu, Jing Tang, Fujun Li, Xizheng Liu and Haoshen Zhou
Chemical Communications 2015 - vol. 51(Issue 94) pp:NaN16863-16863
Publication Date(Web):2015/09/21
DOI:10.1039/C5CC06370A
High charge overpotentials are a great challenge for the realization of lithium–oxygen batteries. Here, we construct a Li–O2 battery system by introducing a limited amount of water into tetraglyme based electrolytes and electrolytic MnO2 (EMD) and Ru supported on Super P as cathodes for Li–O2 batteries. This results in low charge potentials of around 3.2 V, corresponding to overpotentials of 0.24 V, and outstanding rate capability and cycling performance.
Co-reporter:Shengfu Tong, Mingbo Zheng, Yong Lu, Zixia Lin, Xueping Zhang, Ping He and Haoshen Zhou
Chemical Communications 2015 - vol. 51(Issue 34) pp:NaN7304-7304
Publication Date(Web):2015/03/16
DOI:10.1039/C5CC01114K
Network structured carbonized bacterial cellulose-supported Ru nanoparticles (CBC/Ru), which provide sufficient space for Li2O2 deposition without a significant volume effect and improve the transport of oxygen and electrons, were used as the binder-free oxygen electrode in a Li–O2 battery. The CBC/Ru exhibited high activities and good stability during discharge–recharge processes.
Co-reporter:Xizheng Liu, De Li, Songyan Bai and Haoshen Zhou
Journal of Materials Chemistry A 2015 - vol. 3(Issue 30) pp:NaN15407-15407
Publication Date(Web):2015/07/09
DOI:10.1039/C5TA04342E
With the exponentially growing utilization of lithium ion batteries (LIBs), their manufacture and recycling technologies with low cost and low pollution emissions are drawing increasing attention. Herein, we proposed an intelligent battery architecture design with a Magnetic-Manipulated Electrode (MME) by exploiting magnetic Fe3O4 particles as binder. It greatly simplifies the LIB fabrication and recycling technologies, and decreases the total cost as well. In addition, a battery equipped with MME shows anti-vibration and non-fatigue performance.
Co-reporter:Feilong Qiu, Ping He, Jie Jiang, Xueping Zhang, Shengfu Tong and Haoshen Zhou
Chemical Communications 2016 - vol. 52(Issue 13) pp:NaN2716-2716
Publication Date(Web):2016/01/04
DOI:10.1039/C5CC09034B
Ordered mesoporous TiC–C (OMTC) composites were prepared and served as catalysts for nonaqueous Li–O2 batteries. The OMTC cathodes showed high specific capacity, low overpotential and good cyclability. Furthermore, the reaction mechanism of Li–O2 batteries during charge and discharge processes was investigated extensively by XRD, XPS and in situ GC-MS methods.
