高倍率水系碲化铋–锌电池的电荷存储机理研究  

Charge storage mechanism of aqueous bismuth telluride–zinc batteries with high rate capability

作　　者：陈亮 聂浩然 周双 曹国忠 潘安强 Liang Chen;Haoran Nie;Shuang Zhou;Guozhong Cao;Anqiang Pan(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Hunan Collaborative Innovation Center of Environmental and Energy Photocatalysis,Hunan Key Laboratory of Applied Environmental Photocatalysis,Changsha University,Changsha 410022,China;School of Physics and Technology,Xinjiang University,Urumqi 830046,China;Department of Materials Science and Engineering,University of Washington,Seattle,WA,98195,USA)

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]Hunan Collaborative Innovation Center of Environmental and Energy Photocatalysis,Hunan Key Laboratory of Applied Environmental Photocatalysis,Changsha University,Changsha 410022,China [3]School of Physics and Technology,Xinjiang University,Urumqi 830046,China [4]Department of Materials Science and Engineering,University of Washington,Seattle,WA,98195,USA

出　　处：《Science China Materials》2023年第9期3453-3460,共8页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China (51802029);the Scientific Research for the Introduction of Talents of Changsha University (SF1606)。

摘　　要：近十年来,因特有的安全性、低成本和环境友好等特点,水系锌基电池受到了广泛关注.然而,正极材料的反应动力学较差,极大地阻碍了锌电池的发展.近期,铋系的硫属化物在锌电池中展现了优异的电化学性能和巨大的使用潜能.相关研究有待继续开展,以期探明该材料的电化学储能机理,并进一步提升材料的电池性能.在本工作中,采用溶剂热法制备了正六边形的Bi_(2)Te_(3)薄片,并将其用于锌电池的正极材料.通过非原位表征测试和相关电化学分析,我们发现在水系碲化铋–锌电池中存在三个电化学过程:(1)质子嵌入与脱出;(2) Zn_(4)SO_(4)-(OH)_(6)·0.5H_(2)O放电产物的生成与分解;(3)锌离子嵌入与脱出.其中,质子嵌入与脱出占支配地位.因此,相应的碲化铋–锌电池具有较好的倍率性能、循环稳定性和一定的低温电池性能.本工作将有力地推动高性能水系锌电池的发展.In the last decade,aqueous zinc-based batteries(AZBs)have attracted significant research attention owing to their intrinsic security,low cost,and eco-friendliness.Nevertheless,the development of AZBs has been hindered by the sluggish kinetics of cathode materials.Bismuth chalcogenides were recently employed as cathode materials for AZBs,and they exhibited high electrochemical performance and practicability.However,the rate performance of bismuth chalcogenides needs to be improved further,and the corresponding charge storage mechanism needs to be elucidated.In this study,we synthesized Bi_(2)Te_(3) with hexagonal nanoflake morphology(BHN)as a cathode for high-performance bismuth telluride–zinc batteries.The charge storage mechanisms of BHN were investigated through electrochemical tests and ex situ characterization.Three electrochemical processes were found to occur in the aqueous BHN–Zn battery:(1)proton insertion/extraction,(2)Zn_(4)SO_(4)(OH)_(6)·0.5H_(2)O generation/decomposition,and(3)conventional Zn2+insertion/extraction.The proton insertion/extraction process was predominant,which was responsible for the excellent rate capability,cycling durability,and low-temperature performance of the BHN cathode.This work has the potential to facilitate the development of high-performance AZBs.

关 键 词：正极材料 碲化铋 电化学储能 锌电池 电化学过程 电化学分析 电荷存储 正六边形 

分 类 号：TM912[电气工程—电力电子与电力传动]