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Electrochemical reaction mechanism of porous Zn_(2)Ti_(3)O_(8)as a high-performance pseudocapacitive anode for Li-ion batteries

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Chinese Chemical Letters 2022年第11期33卷 4776-4780页

作者： Weijie Cheng Qi Feng Zhanglin Guo Guanjun Chen Yong Wang Lixiong Yin Jiayin Li Xingang Kong School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi'an 710021China Graduate School of Engineering Toin University of YokohamaKanagawa 225-8503Japan Department of Advanced Materials Science Faculty of EngineeringKagawa University2217-20 Hayashi-choTakamatsu-shi 761-0396Japan

Zn_(2)Ti_(3)O_(8),as a new type of anode material for lithium-ion batteries,is attracting enormous attention because of its low cost and excellent *** decent capacities have been reported,the electrochemical reaction mechanism of Zn_(2)Ti_(3)O_(8)has rarely been *** this work,a porous Zn_(2)Ti_(3)O_(8)anode with considerably high capacity(421 mAh/g at 100 mA/g and 209 mAh/g at 5000 mA/g after 1500 cycles)was reported,which is even higher than ever reported titanium-based anodes materials including Li_(4)Ti_(5)O_(12),TiO_(2)and Li_(2)ZnTi_(3)O_(8).Here,for the first time,the accurate theoretical capacity of Zn_(2)Ti_(3)O_(8)was confirmed to be 266.4 mAh/*** was also found that both intercalation reaction and pseudocapacitance contribute to the actual capacity of Zn_(2)Ti_(3)O_(8),making it possibly higher than the theoretical *** importantly,the porous structure of Zn_(2)Ti_(3)O_(8)not only promotes the intercalation reaction,but also induces high pseudocapacitance capacity(225.4 mAh/g),which boosts the reversible ***,it is the outstanding pseudocapacitance capacity of porous Zn_(2)Ti_(3)O_(8)that accounts for high actual capacity exceeding the theoretical *** work elucidates the superiorities of porous structure and provides an example in designing high-performance electrodes for lithium-ion batteries.

关键词： Zn_(2)Ti_(3)O_(8) Lithium-ion battery Electrochemical reaction mechanism theoretical capacity Pseudocapacitance

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Raising the capacity of lithium vanadium phosphate via anion and cation co-substitution

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Science China Chemistry 2020年第2期63卷 203-207页

作者： Xian-Xiang Zeng Hui Chen Gang Guo Sheng-Yi Li Jin-Ying Liu Qiang Ma Guote Liu Ya-Xia Yin Xiong-Wei Wu Yu-Guo Guo College of Science Hunan Agricultural UniversityChangsha 410128China Laboratory of Molecular Nanostructure and Nanotechnology Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China College of Electrical Engineering and Automation Foshan UniversityFoshan 528225China

The pursuit for batteries with high specific energy provokes the research of high-voltage/capacity cathode materials with superior stability and safety as the alternative for lithium iron ***,using the sol-gel method,a lithium vanadium phosphate with higher average discharge voltage(3.8 V,***+/Li) was obtained from a single source for Mg2+ and Cl-co-substitution and uniform carbon coating,and a nearly theoretical capacity(130.1 mA h g^-1) and outstanding rate performance(25 C) are acquired together with splendid capacity retention(80%) after 650 *** work reveals that the well-sized anion and cation substitution and uniform carbon coating are of both importance to accelerate kinetic performance in the context of nearly undisturbed crystal structure for other analogue *** is anticipated that the electrochemistry comprehension will shed light on preparing cathode materials with high energy density in the future.

关键词： polyanion cathode ion substitution carbon coating high rate theoretical capacity

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