Structural engineering of cathodes for improved Zn-ion batteries  

作　　者：Jiajia Huang Yuying Li Ruikuan Xie Jianwei Li Zhihong Tian Guoliang Chai Yanwu Zhang Feili Lai Guanjie He Chuntai Liu Tianxi Liu Dan J.L.Brett 

机构地区：[1]School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China [2]Electrochemical Innovation Lab,Department of Chemical Engineering,University College London,London WC1E 7JE,UK [3]State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences(CAS),Fuzhou 350002,Fujian,China [4]Key Laboratory of Materials Processing and Mold(Zhengzhou University),Ministry of Education,National Engineering Research Center for Advanced Polymer Processing Technology,Zhengzhou University,Zhengzhou 450002,Henan,China [5]Department of Chemistry,KU Leuven,Celestijnenlaan 200F,Leuven 3001,Belgium [6]School of Chemistry,University of Lincoln,Joseph Banks Laboratories,Green Lane,Lincoln,LN67DL,UK

出　　处：《Journal of Energy Chemistry》2021年第7期147-155,共9页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51873198,51503184 and 21703248);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB20000000);the Engineering and Physical Sciences Research Council(EPSRC,EP/R023581/1);the RSC Mobility Grant(M19-7656)and the STFC Batteries Network(ST/R006873/1)。

摘　　要：Aqueous zinc-ion batteries(ZIBs) are attracting considerable attention because of their low cost,high safety and abundant anode material resources.However,the major challenge faced by aqueous ZIBs is the lack of stable and high capacity cathode materials due to their complicated reaction mechanism and slow Zn-ion transport kinetics.This study reports a unique 3 D ’flower-like’ zinc cobaltite(ZnCo_(2)O_(4-x)) with enriched oxygen vacancies as a new cathode material for aqueous ZIBs.Computational calculations reveal that the presence of oxygen vacancies significantly enhances the electronic conductivity and accelerates Zn^(2+) diffusion by providing enlarged channels.The as-fabricated batteries present an impressive specific capacity of 148.3 mAh g^(-1) at the current density of 0.05 A g^(-1),high energy(2.8 Wh kg^(-1)) and power densities(27.2 W kg^(-1)) based on the whole device,which outperform most of the reported aqueous ZIBs.Moreover,a flexible solid-state pouch cell was demonstrated,which delivers an extremely stable capacity under bending states.This work demonstrates that the performance of Zn-ion storage can be effectively enhanced by tailoring the atomic structure of cathode materials,guiding the development of low-cost and eco-friendly energy storage materials.

关 键 词：Zinc cobaltite Oxygen vacancies Aqueous zinc-ion batteries Flexible solid-state pouch cell 

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]