abstract |
The invention relates to a lithium ion battery protecting film. The composition of the protecting film is one or a mixture of AlxMyPO4 and AlxMy(PO3)3, wherein the valence state of M is k, M is one or a mixture of multiple of Cr, Zn, Cu, Mg, Zr, Mo, V, Nb and Ta, x is larger than 0 and less than 1, y is larger than 0 and less than 1, and 3x+ky=3. In the invention, the protecting film is applied to a lithium ion battery to improve the stability of the lithium ion battery. |