非阻塞I/O
锂(药物)
X射线光电子能谱
材料科学
化学工程
阴极
锂离子电池
容量损失
离子
吸附
表层
图层(电子)
化学
电池(电)
电化学
复合材料
电极
催化作用
有机化学
物理化学
功率(物理)
内分泌学
工程类
物理
医学
量子力学
作者
Hansan Liu,Yong Yang,Jiujun Zhang
标识
DOI:10.1016/j.jpowsour.2006.07.028
摘要
LiNi0.8Co0.2O2 cathode material showed a performance loss after storage in air. The surface species on the material formed during the exposure to air were identified through TG, SEM, TPD-MS, XRD and XPS. Two thin layers were found on the surface. The first layer in contact with the bulk material contains NiO-like species, and the top layer consists of adsorbed hydroxyl, bicarbonate, carbonate, and crystalline Li2CO3. These two layers are both electrochemically inactive and poor conductors for Li+ ions, which are believed to be responsible for the storage loss. A chemical reaction mechanism, involving atmospheric H2O and CO2, and the particle surface of LiNi0.8Co0.2O2 material, was proposed to explain the formation process of those surface species. For storage loss prevention, a doping approach to reduce nickel content and a storage approach to isolate the material from H2O and CO2 were found to be effective to improve the storage property of LiNiO2-based materials. For storage loss recovery, a heat-treatment process at 725 °C was demonstrated to be a feasible approach for full recovery of the performance.
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