An in-situ self-etching enabled high-power electrode for aqueous zinc-ion batteries  

作　　者：Shuang Hou Dingtao Ma Yanyi Wang Kefeng Ouyang Sicheng Shen Hongwei Mi Lingzhi Zhao Peixin Zhang 

机构地区：[1]College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China [2]Guangdong Provincial Engineering Technology Research Center for Low Carbon and Advanced Energy Materials,School of Semiconductor Science and Technology,South China Normal University,Foshan 528225,Guangdong,China [3]SCNU Qingyuan Institute of Science and Technology Innovation Co.,Ltd.,Qingyuan 511517,Guangdong,China

出　　处：《Journal of Energy Chemistry》2024年第1期399-408,I0009,共11页能源化学（英文版）

基　　金：financially supported by the Shenzhen Science and Technology Program (JCYJ20200109105805902,JCYJ20220818095805012);the National Natural Science Foundation of China (22208221,22178221,42377487);the Scientific and Technological Plan of Guangdong Province (2019B090905005,2019B090911004);the Natural Science Foundation of Guangdong Province (2021A1515110751);the Guangdong Basic and Applied Basic Research Foundation (2022A1515110477,2021B1515120004)。

摘　　要：Sluggish storage kinetics is considered as the main bottleneck of cathode materials for fast-charging aqueous zinc-ion batteries(AZIBs).In this report,we propose a novel in-situ self-etching strategy to unlock the Palm tree-like vanadium oxide/carbon nanofiber membrane(P-VO/C)as a robust freestanding electrode.Comprehensive investigations including the finite element simulation,in-situ X-ray diffraction,and in-situ electrochemical impedance spectroscopy disclosed it an electrochemically induced phase transformation mechanism from VO to layered Zn_(x)V_(2)O_5·nH_(2)O,as well as superior storage kinetics with ultrahigh pseudocapacitive contribution.As demonstrated,such electrode can remain a specific capacity of 285 mA h g^(-1)after 100 cycles at 1 A g^(-1),144.4 mA h g^(-1)after 1500 cycles at 30 A g^(-1),and even 97 mA h g^(-1)after 3000 cycles at 60 A g^(-1),respectively.Unexpectedly,an impressive power density of 78.9 kW kg^(-1)at the super-high current density of 100 A g^(-1)also can be achieved.Such design concept of in-situ self-etching free-standing electrode can provide a brand-new insight into extending the pseudocapacitive storage limit,so as to promote the development of high-power energy storage devices including but not limited to AZIBs.

关 键 词：In-situ self-etching Free-standing electrode Pseudocapacitive storage HIGH-POWER Zinc-ion batteries 

分 类 号：TB34[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]