Patent ID: 7655360

Claim:
A lithium battery comprising an electrical separator comprising: a porous carrier; a porous inorganic nonelectroconductive coating on a surface and in the pores of the porous carrier; and a porous shutdown layer on the porous inorganic nonelectroconductive coating; wherein the porous carrier is nonelectroconductive and has a porosity greater than 50%, the porous inorganic nonelectroconductive coating comprises particles of at least one selected from the group consisting of an oxide of Al, an oxide of Si and an oxide of Zr, the particles have an average particle size in the range from 0.5 to 10 μm, and in the porous inorganic nonelectroconductive coating the particles are adhered together by an oxide of Al, Si or Zr, and the porous shutdown layer comprises a sheet of materials selected such that the shutdown layer will melt at a temperature determined as the shutdown temperature of the electrical separator.