Belongs to. In 1886, Hall of the United States and Herult of France applied for patents for electrolytic production of metallic aluminum using carbon electrodes as anodes and graphite crucibles as containers and cathodes. Therefore, the crucible was a cathode material. The cathode material adopts a self-developed new technology of solid-phase reaction multi-cation doping combined with double coating, which stabilizes the spinel structure through multi-cation doping, and then isolates LiMn2O4 particles from the electrolyte through double coating, a two-pronged approach. This way, the spinel-type LiMn2O4 cathode material not only has high discharge capacity, but also has high cycle stability.