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A Universal Strategy toward the Precise Regulation of Initial Coulombic Efficiency of Li‐Rich Mn‐Based Cathode Materials
Author(s) -
Guo Weibin,
Zhang Chenying,
Zhang Yinggan,
Lin Liang,
He Wei,
Xie Qingshui,
Sa Baisheng,
Wang Laisen,
Peng DongLiang
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202103173
Subject(s) - faraday efficiency , cathode , materials science , ion , electrochemistry , nanotechnology , interface (matter) , lithium (medication) , chemical engineering , engineering physics , electrode , chemistry , composite material , medicine , organic chemistry , capillary number , capillary action , engineering , endocrinology
Abstract Li‐rich Mn‐based cathode materials (LRMs) are potential cathode materials for high energy density lithium‐ion batteries. However, low initial Coulombic efficiency (ICE) severely hinders the commercialization of LRM. Herein, a facile oleic acid‐assisted interface engineering is put forward to precisely control the ICE, enhance reversible capacity and rate performance of LRM effectively. As a result, the ICE of LRM can be precisely adjusted from 84.1% to 100.7%, and a very high specific capacity of 330 mAh g −1 at 0.1 C, as well as outstanding rate capability with a fascinating specific capacity of 250 mAh g −1 at 5 C, are harvested. Theoretical calculations reveal that the introduced cation/anion double defects can reduce the diffusion barrier of Li + ions, and in situ surface reconstruction layer can induce a self‐built‐in electric field to stabilize the surface lattice oxygen. Moreover, this facile interface engineering is universal and can enhance the ICEs of other kinds of LRM effectively. This work provides a valuable new idea for improving the comprehensive electrochemical performance of LRM through multistrategy collaborative interface engineering technology.