High manganese polycrystalline cathode material, method for producing the same, and power lithium ion battery

摘要

A high manganese polycrystalline anode material has a formula: Li w Mn x (CoNi) y O z , wherein x=0.4ˆ¼2.0, y=0.1 ˆ¼0.6, x+y2, z‰¥2, W‰¥1, wherein weight of Mn is at least 40% weight of Li w Mn x (CoNi) y O z , particle size thereof is 7ˆ¼20µm, wherein the high manganese polycrystalline anode material is consisted of at least two crystalline textures which are selected from the group consisting of LiMn 2 O 4 , LiCo n (NiMn) 1-n O 2 , LiNi 0.8 Co 0.2 O 2 , LiCoO 2 , LiNiMn 1-n O 2 , LiMn 2n Ni 2(1-n) O 4 and LiNiO 2 , wherein n1, and the crystalline textures are in a symbiotic and mixed phase. The specific energy of the anode material is more than 155Wh/K, the capacity retention is not less than 80% after 500 charging and discharging circles when the charging and discharging rate is 1C at 55 °C, the circulation life span at 25 °C is not less than 1000times, the capacity is maintained above 80%, and the processability of the anode material is good.