Preparation and Electrochemical Properties of AlPO4-Coated LiNi1/3Co1/3Mn1/3O2

Abstract

Abstract: LiNi_1/3Co_1/3Mn_1/3O₂was synthesized by high temperature solid state method,and AlPO₄-coated LiNi_1/3Co_1/3Mn_1/3O₂ was prepared by sol-gel using LiNi_1/3Co_1/3Mn_1/3O₂,Al(NO₃)₃·9H₂O and H₃PO₄ as raw material.The microstructure,surface morphology and electrochemical properties were characterized by various electrochemical methods in combination with X-ray diffraction (XRD) and scanning electron microscope (SEM).Results show that amorphous AlPO₄ is coated on the surface in AlPO₄-coated LiNi_1/3Co_1/3Mn_1/3O₂. AlPO₄ can minimize the side reaction between electrode and electrolyte solution,reduce the surface film impedance and charge transferring impedance,and increase the diffusion vecocity of lithium ion.Thus,the cycling performance and rate performance of LiNi_1/3Co_1/3Mn_1/3O₂ are greatly improved.

Key words: LiNi_1/3Co_1/3Mn_1/3O₂, AlPO₄, coating

LIANG Kai, XIONG Li-Zhi, TANG Ming, HE Ze-Qiang. Preparation and Electrochemical Properties of AlPO₄-Coated LiNi_1/3Co_1/3Mn_1/3O₂[J]. journal6, 2010, 31(2): 89-93.

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Preparation and Electrochemical Properties of AlPO₄-Coated LiNi_1/3Co_1/3Mn_1/3O₂

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