| abstract |
The present application relates to the technical field of energy storage, and relates to a compound for pre-lithiation and a preparation method thereof, a positive electrode pre-lithiation material and a preparation method thereof, and a lithium battery. The chemical formula of the compound is Li x My O z , where 3≤x≤12 , 1≤y≤2, 4≤z≤11, and M is Nb, Ta, Zr, W, Sn, V, Ru, Ce or Bi one or more of. The compound is used as a positive electrode pre-lithiation material with low decomposition potential, high charge specific capacity, irreversible discharge process, and can achieve better in-situ pre-lithiation effect of lithium batteries. It has good air stability and is compatible with existing lithium batteries. The battery production process has commercial application prospects. Lithium batteries using this kind of positive electrode pre-lithiation material, during the battery charging process, the compound irreversibly decomposes to release active lithium ions, which supplements the loss of active lithium caused by the growth of negative electrode SEI, and can achieve the effect of improving the energy density and cycle life of lithium batteries. |