Designing novel electrode materials with unique structures is of great significance for improving the per-formance of lithium ion batteries(LIBs).Herein,copper-doped Co1-xTe@nitrogen-doped carbon hollow nanoboxes(Cu-Co1-xTe@NC HNBs)have been fabricated by chemical etching of CuCo-ZIF nanoboxes,fol-lowed by a successive high-temperature tellurization process.The as-synthesized Cu-Co1-xTe@NC HNBs composite demonstrated faster ionic and electronic diffusion kinetics than the pristine CoTe@NC HNBs electrode.The existence of Co-vacancy promotes the reduction of Gibbs free energy change(△GH*)and effectively improves the Li+diffusion coefficient.XPS and theoretical calculations show that performance improvement is ascribed to the electronic interactions between Cu-Co1-xTe 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(CoSe2)in addition to as-obtained Cu-CO1-xSe2@NC HNBs anodes for long-life and high-capacity LIBs.More importantly,the fabri-cated LiCoO2//Cu-CO1-xTe@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-Co1-xTe@NC HNBs as a superior electrode material for LIBs.

Lei Hu;Lin Li;Yuyang Zhang;Xiaohong Tan;Hao Yang;Xiaoming Lin;Yexiang Tong

Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and Application,School of Chemical and Environmental Engineering,Anhui Polytechnic University,Wuhu 241000,China;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;Key Laboratory of Theoretical Chemistry of Environment,Ministry of Education,School of Chemistry,South China Normal University,Guangzhou 510006,China;Guangxi Key Laboratory of Electrochemical Energy Materials,School of Chemistry&Chemical Engineering,Guangxi University,Nanning 530004,China

材料科学技术（英文版）

[1]Lei Hu;Lin Li;Yuyang Zhang;Xiaohong Tan;Hao Yang;Xiaoming Lin;Yexiang Tong-.Construction of cobalt vacancies in cobalt telluride to induce fast ionic/electronic diffusion kinetics for lithium-ion half/full batteries)[J].材料科学技术（英文版）,2022(32):124-132

xTe,nanoboxes,HNBs,tellurization,CoTe

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