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An Ultra‐Long‐Life Lithium‐Rich Li 1.2 Mn 0.6 Ni 0.2 O 2 Cathode by Three‐in‐One Surface Modification for Lithium‐Ion Batteries
Author(s) -
Ding Xiaokai,
Luo Dong,
Cui Jiaxiang,
Xie Huixian,
Ren Qingqing,
Lin Zhan
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202000628
Subject(s) - materials science , spinel , electrolyte , electrochemistry , surface modification , lithium (medication) , chemical engineering , fading , cathode , diffusion , electrode , metallurgy , chemistry , electrical engineering , medicine , channel (broadcasting) , physics , engineering , thermodynamics , endocrinology
Voltage decay and capacity fading are the main challenges for the commercialization of Li‐rich Mn‐based layered oxides (LLOs). Now, a three‐in‐one surface treatment is designed via the pyrolysis of urea to improve the voltage and capacity stability of Li 1.2 Mn 0.6 Ni 0.2 O 2 (LMNO), by which oxygen vacancies, spinel phase integration, and N‐doped carbon nanolayers are synchronously built on the surface of LMNO microspheres. Oxygen vacancies and spinel phase integration suppress irreversible O 2 release and help lithium ion diffusion, while N‐doped carbon nanolayer mitigates the corrosion of electrolyte with excellent conductivity. The electrochemical performance of LMNO after the treatment improves significantly; the capacity retention rate after 500 cycles at 1 C is still as high as 89.9 % with a very small voltage fading rate of 1.09 mV cycle −1 . This three‐in‐one surface treatment strategy can suppress the voltage decay and capacity fading of LLOs.