Comparative study of LiNiO₂, LiNi_0.8Co_{0. 2}O₂ and LiNi_0.75Al_0.25O₂ for lithium-ion batteries

Chuangang Lin, Weihua Qiu, Zhimin Li, Jialing Hong, Huanyu Hu, and Zhongqin LuLaboratory on Solid State Ionics, University of Science and Technology Beijing, Beijing 100083, China

摘 要：<正>The comparative study of LiNi0.8Co0.2O2 and LiNi0.75A10.25O2 was carried out by X-ray diffraction （XRD） and electrochemical methods. The results show that Co and Al doping suppress the phase transition during charge-discharge. The experiments indicate that LiNi0.75Al0.25O2 has the better cycle-ability and over-charge resistance comparing with LiNi0.8Co0.2O2. The interfacial behavior was studied by use of electrochemical impedance spectroscopy （EIS）. The results show that LiNi0.75A10.25O2 has a slightlylarger polarization character than LiNi0.8Co0.2O2.

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