Construction of cobalt vacancies in cobalt telluride to induce fast ionic/electronic diffusion kinetics for lithium-ion half/full batteries  

作　　者：Lei Hu Lin Li Yuyang Zhang Xiaohong Tan Hao Yang Xiaoming Lin Yexiang Tong 

机构地区：[1]Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application,School of Chemical and Environmental Engineering,Anhui Polytechnic University,Wuhu 241000,China [2]MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry,The Key Laboratory of Low-Carbon Chemistry&Energy Conservation of Guangdong Province,School of Chemistry,Sun Yat-Sen University,Guangzhou 510275,China [3]Guangxi Key Laboratory of Electrochemical Energy Materials,School of Chemistry&Chemical Engineering,Guangxi University,Nanning 530004,China [4]Key Laboratory of Theoretical Chemistry of Environment,Ministry of Education,School of Chemistry,South China Normal University,Guangzhou 510006,China

出　　处：《Journal of Materials Science & Technology》2022年第32期124-132,共9页材料科学技术（英文版）

基　　金：the Natural Science Foundation of Anhui Province Higher Education Institutions(No.KJ2021A0501);the Foundation of Scientific Research Project of Anhui Polytechnic University(No.Xjky2020090);the Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application(Nos.LFCCMCA-01 and LFCCMCA-06);the Scientific Research Launch Project of Anhui Polytechnic University(No.2020YQQ057);the Innovation and Entrepreneurship Training Program for College Students in Anhui Province(No.S202110363265);the National Key Research and Development Program of China(2019YFA0705702);the National Natural Science Foundation of China(21902188)。

摘　　要：Designing novel electrode materials with unique structures is of great significance for improving the performance of lithium ion batteries(LIBs).Herein,copper-doped Co_(1-x)Te@nitrogen-doped carbon hollow nanoboxes(Cu-Co_(1-x)Te@NC HNBs)have been fabricated by chemical etching of Cu Co-ZIF nanoboxes,followed by a successive high-temperature tellurization process.The as-synthesized Cu-Co_(1-x)Te@NC HNBs composite demonstrated faster ionic and electronic diffusion kinetics than the pristine Co Te@NC HNBs electrode.The existence of Co-vacancy promotes the reduction of Gibbs free energy change(ΔG_(H^(*)))and effectively improves the Li~+diffusion coefficient.XPS and theoretical calculations show that performance improvement is ascribed to the electronic interactions between Cu-Co_(1-x)Te and nitrogen-doped carbon(NC)that trigger the shift of the p-band towards facilitation of interfacial charge transfer,which in turn helps boost up the lithium storage property.Besides,the proposed Cu-doping-induced Co-vacancy strategy can also be extended to other conversion-type cobalt-based material(CoSe_(2))in addition to asobtained Cu-Co_(1-x)Se_(2)@NC HNBs anodes for long-life and high-capacity LIBs.More importantly,the fabricated LiCoO_(2)//Cu-Co_(1-x)Te@NC HNBs full cell exhibits a high energy density of 403 Wh kg^(-1)and a power density of 6000 W kg^(-1).We show that the energy/power density reported herein is higher than that of previously studied cobalt-based anodes,indicating the potential application of Cu-Co_(1-x)Te@NC HNBs as a superior electrode material for LIBs.

关 键 词：MOF-derived material Cobalt telluride Cobalt vacancy Diffusion kinetics Lithium storage 

分 类 号：TB33[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]