Recovery and improvement the electrochemical performances of degraded LiNi0.8Co0.15Al0.05O2 for lithium ion batteries cathode materials
作者单位：College of Chemistry and Chemical Engineering and Henan Key laboratory of Function-Oriented Porous Materials Luoyang Normal University
会议名称：《河南省化学会2016年学术年会》
会议日期：2016年
学科分类：081702[工学-化学工艺] 080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术]
关 键 词：degradation recovery Li Ni0.8Co0.15Al0.05O2 cathode materials lithium ion batteries
摘 要：The degradation of Ni-rich cathode materials exposing in the air is an inherent issue for its large-scale application. Tetraethyl orthosilicate(TEOS) was utilized to dispose of the LiOH and LiCO impurities which generated by the resultant reaction between the residual lithium on the surface of LiNiCoAlO(NCA) cathode materials and the HO and CO in the air. After the reoxidation and coating process in the O atmosphere, a stable coating layer containing Si element was successful formed. The morphology, structure and composition of the as-prepared samples were investigated by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning scanning electron microscope(SEM) and transmission electron microscopy(TEM). Owing to the facile treatment, the resultant TEOS treated NCA(SNCA) used as lithium ion batteries cathode materials manifest remarkably enhanced cycling performance, attaining 85% capacity retention after 100 cycles at 1 C,which is much better than the fresh NCA(FNCA, 71% retention) and degraded NCA(DNCA, 33%retention) counterparts. All of these results demonstrate that such a treatment with DNCA not only reduces the amount of surface impurities, but also endows the electrode materials the capacity of reduction side reaction and improvement the structural stability.