Patent ID: 8835059
Filing Date: 2014-09-16
Classification: H01M,Y02E

Abstract:
1. A lithium rechargeable battery, comprising: a cathode; an anode; a separator separating the cathode and the anode from each other, the separator comprising a porous membrane formed of a ceramic material and a binder, the binder having an elongation ratio of 200 to 300%; and a non-aqueous electrolyte, wherein the porous membrane has a porosity of at least 50%; and the binder consists of an acrylic rubber formed by crosslinking a polymer or copolymer of a main acrylic monomer with a crosslinkable monomer; the polymer or the copolymer is mixed with the crosslinkable monomer in a weight ratio ranging from 90:10 to 60:40; and the ceramic material is secondary particles; the secondary particles are formed of primary particles; and the primary particles are scale-like flakes having a width of 100 nm to 1.0 μm.