Constructing oxygen deficiency-rich V_(2)O_(3)@PEDOT cathode for high-performance aqueous zinc-ion batteries  

作　　者：Dong-Fei Sun Zi-Juan Wang Tian Tian Xin Yu Dan-Dan Yu Xiao-Zhong Zhou Guo-Fu Ma Zi-Qiang Lei 

机构地区：[1]Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education,Key Laboratory of Eco-environmental Polymer Materials of Gansu Province,School of College of Chemistry and Chemical Engineering,Northwest Normal University,Lanzhou,730070,China

出　　处：《Rare Metals》2024年第2期635-646,共12页稀有金属（英文版）

基　　金：This study was financially supported by the National Natural Science Foundation of China(No.22165028);the Nature Science Foundation of Gansu Province(No.20JR10RA108).

摘　　要：Aqueous zinc-ion batteries(AZIBs)have attracted widespread attention due to the advantages of high safety and environmental friendliness.Although V_(2)O_(3) is a promising cathode,the strong electrostatic interaction between Zn^(2+) and V_(2)O_(3) crystal,and the sluggish reaction kinetics still limit their application in AZIBs.Herein,the oxygen defects rich V_(2)O_(3) with conducive poly(3,4-ethylenedioxythiophene)(PEDOT)shell(V_(2)O_(3)-Od@PEDOT)was fabricated for AZIBs by combining the sulfur-assisted thermal reduction and in-situ polymerization method.The introduced oxygen vacancies of V_(2)O_(3)–Od@PEDOT weaken the electrostatic interaction between Zn^(2+) and the host material,improving the interfacial electron transport,while the PEDOT coating enhances the structural stability and conductivity of V_(2)O_(3),thus accelerating the reaction kinetics.Based on the advantages,V_(2)O_(3)–Od@PEDOT electrode delivers a reversible capacity of 495 mAh·g^(−1) at 0.1 A·g^(−1),good rate capability(189 mAh·g^(−1)at 8.0 A·g^(−1)),and an impressive cycling stability with 90.1%capacity retention over 1000 cycles at 8.0 A·g^(−1).The strategy may provide a path for exploiting the other materials for high performance AZIBs.

关 键 词：Oxygen defects V_(2)O_(3) PEDOT Electrochemical self-optimization Aqueous zinc-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] O646.541[理学—物理化学]