Abstract
The Ni-rich LiNi0.8Co0.1Mn0.1O2 layered oxide (NCM811) is a kind of high-capacity cathode materials for rechargeable Li-ion batteries. However, due to the high Ni content, NCM811 becomes very active and unstable, especially under high temperature environment. This is the reason why NCM811 cathodes often suffer from electrolyte decomposition and then generate a SEI layer on the surface during charge-discharge cycling.To solve the unstable problems of NCM811, this work is to construct a layer of fluorinated soft artificial interphase on the surface of the NCM811 electrode material by means of simple and convenient polymer-coating and partial-thermal-treatment. When the surface becomes more hydrophobic, the less moisture in the air will adsorb, and it avoids the detrimental reaction with the electrolyte. Also, the coating reacts to some extent with the residue lithium to form lithium fluoride and stabilizes the surface. Electron-conductive additive was added as electron channel to enhance the overall performance of intercalation/deintercalation. The results demonstrate that the artificial surface layer led to substantial improvement in cycle stability.(This work is supported by Industrial Technology Research Institute, Taiwan.)
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