Pre-potassiated hydrated vanadium oxide as cathode for quasi-solid-state zinc-ion battery  

作　　者：Qifei Li Xiangxiang Ye Hong Yu Chengfeng Du Wenping Sun Weiling Liu Hongge Pan Xianhong Rui 

机构地区：[1]School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,China [2]Center of Advanced Lubrication and Seal Materials,Northwestern Polytechnical University,Xi’an 710072,China [3]Institute of Science and Technology for New Energy,Xi’an Technological University,Xi’an 710021,China [4]School of Materials Science and Engineering,State Key Laboratory of Silicon Materials,Zhejiang University,Hangzhou 310027,China [5]School of Materials Science and Engineering,Nanyang Technological University,Singapore 639798,Singapore

出　　处：《Chinese Chemical Letters》2022年第5期2663-2668,共6页中国化学快报（英文版）

基　　金：the National Natural Sci-ence Foundation of China(Nos.51972067,51802265,51802044,51902062 and 51802043);the Guangdong Natural Science Funds for Distinguished Young Scholar(No.2019B151502039).

摘　　要：Zinc-ion batteries(ZIBs),in particular quasi-solid-state ZIBs,occupy a crucial position in the field of energy storage devices owing to the superiorities of abundant zinc reserve,low cost,high safety and high theoretical capacity of zinc anode.However,as divalent Zn^(2+)ions experience strong electrostatic interactions when intercalating into the cathode materials,which poses challenges to the structural stability and higher demand in Zn^(2+)ions diffusion kinetics of the cathode materials.Here,a microwave-assisted hydrothermal method is adopted to prepare pre-potassiated hydrated vanadium pentoxide(K_(0.52)V_(2)O_(5)·0.29H_(2)O,abbreviated as KHVO)cathode material,in which the potassium ions preinserted into the interlayers can act as“pillars”to stabilize the lamellar structure,and crystal water can act as“lubricant”to improve the diffusion efficiency of Zn^(2+)ions.Consequently,the KHVO displays high electrochemical properties with high capacity(∼300 mAh/g),superior rate capability(69 mAh/g at 5 A/g)and ultralong cycling performance(>1500 cycles at 2 A/g)in quasi-solid-state ZIBs.These superior Zn storage properties result from the large diffusion coefficient and highly stable and reversible Zn^(2+)(de)intercalation reaction of KHVO.

关 键 词：Quasi-solid-state Zinc-ion batteries Hydrated vanadium oxide Pre-potassiated Electrochemical kinetics 

分 类 号：TQ135.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]