电解质
尖晶石
拉曼光谱
阴极
电化学
介电谱
材料科学
容量损失
锂(药物)
相(物质)
腐蚀
表面改性
化学工程
化学
复合材料
冶金
物理化学
电极
工程类
光学
有机化学
内分泌学
物理
医学
作者
Pingquan Huang,Xiaoxia Ding,Jiaxiang Cui,Huixian Xie,Chenyu Liu,Dong Luo
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2023-03-01
卷期号:37 (6): 4682-4691
标识
DOI:10.1021/acs.energyfuels.2c04249
摘要
Lithium-rich layered oxides with superior capacity over 250 mA h g–1 have been regarded as one of the most promising cathode materials to address the problem of low endurance of electric vehicles. Unfortunately, their practical application has been blocked for decades by severe voltage decay and capacity fading, which mainly originate from structure evolution of layered to spinel-like phase and undesirable cathode–electrolyte interfacial reactions. Herein, the inhomogeneous distribution of LiMO2 and Li2MnO3 components on the surface of Li1.2Mn0.6Ni0.2O2 (LMNO) is constructed by a facile NH3·H2O-assisted Mn- and Ni-treatment method, demonstrated by Raman results. As supported by dQ/dV curves and electrochemical impedance spectroscopy data, the inhomogeneous surface improves the corrosion resistance against the electrolyte and enhances the surface–interface stability. Compared with the pristine one (P-LMNO), the Mn- and Ni-treated samples (M-LMNO and N-LMNO) deliver excellent cycling stability. After 200 cycles, the discharge capacity of the M-LMNO and N-LMNO samples is still as large as 154.5 and 174.0 mA h g–1 at 200 mA g–1, respectively, which is about twice as large as that of the P-LMNO sample. This work proposes a facile and effective surface-treated strategy for Li-rich layered cathodes to alleviate structure evolution and suppress the erosion of electrolytes.
科研通智能强力驱动
Strongly Powered by AbleSci AI