Method for preparing high-performance lithium manganate cathode materials gradient

The present invention discloses a high-performance gradient lithium manganate cathode material is manganese source material, lithium source material, a dopant material M and the coating, wherein Li: Mn molar ratio of 0.46 to 0.65, a dopant M the dosage accounts for 0.01 ~ 10 wt% of lithium manganate, Volume coating material accounts for 0.01 ~ 20 wt% of the lithium manganate. The present invention improves the structural stability by doping lithium manganate, cladding material concentration gradient is achieved by coating full play the role of stabilizing the structure of the material, to improve the cycle characteristics and high temperature performance, the discharge specific capacity can reach 110 mAh / g or more, a high temperature was 45 ℃ 100 cycle capacity retention rate of 94%, 60 ℃ the capacity retention rate of 92%, 70 ℃ the capacity retention rate of 89%.