关键词: 锂离子电池, 正极材料, Li1.2Mn0.6Ni0.2O2, 电化学性能

Abstract: Manganese enriched cathode material Li1.2Mn0.6Ni0.2O2 was synthesized by high temperature solid state method using Li2CO3 and spheroidal precursor-Mn0.6Ni0.2（OH）1.6 as raw materials.The structures and morphologies of products were characterized by XRD and SEM.Their electrochemical performances were also investigated.Results showed that when the lithium salt dosage was excess of 4%，the synthesized Li1.2Mn0.6Ni0.2O2  presented the most complete crystal structure，the most perfect spherical shape and showed excellent electrochemical performance.The initial discharge capacity reached 250.7 mA·h/g and 235.2 mA·h/g at the rates of 0.2 C and 1.0 C，respectively.The capacity retention at 1.0 C was 86.86% after 50 charge/discharge cycles.

Key words: lithium ion battery, cathode materials, Li1.2Mn0.6Ni0.2O2 , electrochemical performance