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Mg‐Pillared LiCoO 2 : Towards Stable Cycling at 4.6 V
Author(s) -
Huang Yangyang,
Zhu Yongcheng,
Fu Haoyu,
Ou Mingyang,
Hu Chenchen,
Yu Sijie,
Hu Zhiwei,
Chen ChienTe,
Jiang Gang,
Gu Hongkai,
Lin He,
Luo Wei,
Huang Yunhui
Publication year - 2021
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.202014226
Subject(s) - electrolyte , materials science , cathode , anode , phase (matter) , lithium (medication) , ion , chemical engineering , analytical chemistry (journal) , electrode , chemistry , medicine , organic chemistry , chromatography , engineering , endocrinology
LiCoO 2 is used as a cathode material for lithium‐ion batteries, however, cationic/anodic‐redox‐induced unstable phase transitions, oxygen escape, and side reactions with electrolytes always occur when charging LiCoO 2 to voltages higher than 4.35 V, resulting in severe capacity fade. Reported here is Mg‐pillared LiCoO 2 . Dopant Mg ions, serving as pillars in the Li‐slab of LiCoO 2 , prevent slab sliding in a delithiated state, thereby suppressing unfavorable phase transitions. Moreover, the resulting Li‐Mg mixing structure at the surface of Mg‐pillared LiCoO 2 is beneficial for eliminating the cathode‐electrolyte interphase overgrowth and phase transformation in the close‐to‐surface region. Mg‐pillared LiCoO 2 exhibits a high capacity of 204 mAh g −1 at 0.2 C and an enhanced capacity retention of 84 % at 1.0 C over 100 cycles within the voltage window of 3.0–4.6 V. In contrast, pristine LiCoO 2 has a capacity retention of 14 % within the same voltage window.