Study on Performance of LiCoO_2 Modified LiMn_2O_4 as Cathode Materials of Lithium-ion Batteries

Adopting the sol-gel method, the LiCoO_2- modified LiMn_2O_4 material was prepared by using glycol as a chelating agent and putting commercial LiMn_2O_4 into the solution containing Lithium acetate (LiAc·2H_2O) and cobalt acetate (Co(Ac)_2·4H_2O) with regulating pH value. The resultant solution was stirred in distilled water and vaporized slowly and calcined. The effects of LiCoO_2 modified amount ?calcination temperature and calcination time on the crystal structure and electrochemical capacity of LiCoO_2- modified LiMn_2O_4 were investigated by XRD and TGA-DTA. The best technics was that LiCoO_2 modified amount was 7 % and calcination time was 6 h and calcination temperature was 800 ℃.