尖晶石
材料科学
阴极
电化学
锂(药物)
化学工程
电池(电)
离子
氧化物
烧结
表面改性
电导率
电极
复合材料
冶金
化学
热力学
物理化学
内分泌学
工程类
功率(物理)
有机化学
物理
医学
作者
Chunze Ma,Yuehua Wen,Qian Qiao,Pan He,Ren Shuqing,Meng Li,Pengcheng Zhao,Jingyi Qiu,Guangshi Tang
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-10-28
卷期号:4 (11): 12201-12210
被引量:13
标识
DOI:10.1021/acsaem.1c01891
摘要
Spinel LiNi0.5Mn1.5O4(LNMO) is considered as a next generation lithium-ion battery (LIB) cathode material worth studying on account of its outstanding features. However, it is held back by poor cycling performance originated from the structure instability and side reactions. Here, spinel LNMO is decorated homogeneously via a facile hydrolysis and adsorption of γ-methyl-propylene trimethoxysilane (KH570), followed by thermal treatment at 750 °C, to bring a SiO2 modification shell at the surface of LNMO and realize the ion doping of Si. The sintering process also brings more Mn3+ in LNMO. However, only a moderate increase of Mn3+ in LNMO can enhance the conductivity of ions and electrons, benefiting the enhancement of rate performance. The 0.8%-SiO2@LNMO cathode exhibits a high reversible capacity of 129 mAh g–1, retaining a great capacity retention of 88% after 800 cycles at 1 C and 89.7% after 1000 cycles at 3 C. Meanwhile, a superior rate capability (90 mAh g–1 at 5 C) is achieved by applying the galvanostatic charge/discharge test.
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