Affiliation:
1. State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China
2. Laboratory for Advanced Materials & Electron Microscopy Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Beijing 100190 China
3. Tianmu Lake Institute of Advanced Energy Storage Technologies Co. Ltd Liyang 213300 China
4. Institute of Applied Materials Helmholtz‐Zentrum Berlin für Materialien und Energie 14109 Berlin Germany
Abstract
AbstractRaising the charging cut‐off voltage of layered oxide cathodes can improve their energy density. However, it inevitably introduces instabilities regarding both bulk structure and surface/interface. Herein, exploiting the unique characteristics of high‐valence Nb5+ element, a synchronous surface‐to‐bulk‐modified LiCoO2 featuring Li3NbO4 surface coating layer, Nb‐doped bulk, and the desired concentration gradient architecture through one‐step calcination is achieved. Such a multifunctional structure facilitates the construction of high‐quality cathode/electrolyte interface, enhances Li+ diffusion, and restrains lattice‐O loss, Co migration, and associated layer‐to‐spinel phase distortion. Therefore, a stable operation of Nb‐modified LiCoO2 half‐cell is achieved at 4.6 V (90.9% capacity retention after 200 cycles). Long‐life 250 Wh kg−1 and 4.7 V‐class 550 Wh kg−1 pouch cells assembled with graphite and thin Li anodes are harvested (both beyond 87% after 1600 and 200 cycles). This multifunctional one‐step modification strategy establishes a technological paradigm to pave the way for high‐energy density and long‐life lithium‐ion cathode materials.
Funder
Fundamental Research Funds for the Central Universities
Xiamen University
Innovative Research Group Project of the National Natural Science Foundation of China
Beijing Synchrotron Radiation Facility
Ministry of Science and Technology of the People's Republic of China
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
2 articles.
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