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

作　　者：Weijie Cheng Qi Feng Zhanglin Guo Guanjun Chen Yong Wang Lixiong Yin Jiayin Li Xingang Kong 

机构地区：[1]School of Materials Science and Engineering,Shaanxi University of Science and Technology,Xi'an 710021,China [2]Graduate School of Engineering,Toin University of Yokohama,Kanagawa 225-8503,Japan [3]Department of Advanced Materials Science,Faculty of Engineering,Kagawa University,2217-20 Hayashi-cho,Takamatsu-shi 761-0396,Japan

出　　处：《Chinese Chemical Letters》2022年第11期4776-4780,共5页中国化学快报（英文版）

基　　金：the support of Project Supported by Keypoint Research and Invention in Shaanxi Province of China(No.2020GY-270);Service local special plan project of Education Department of Shaanxi Province(No.19JC009)。

摘　　要：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 safety.Though decent capacities have been reported,the electrochemical reaction mechanism of Zn_(2)Ti_(3)O_(8)has rarely been studied.In 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/g.It 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 value.Most 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 capacity.Therefore,it is the outstanding pseudocapacitance capacity of porous Zn_(2)Ti_(3)O_(8)that accounts for high actual capacity exceeding the theoretical one.This 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 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ132.41[化学工程—无机化工]