Patent ID: 11949124
Assignee: CELGARD, LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A separator for a high energy rechargeable lithium battery comprises:
at least one ceramic composite layer, said layer being formed from a coating composition which includes from 0.5 to 95 wt % of a matrix material or a polymeric binder, from 5 to 95 wt % of heat-resistant particles, and from 5,000 ppm to 50,000 ppm of a cross-linker, wherein the cross-linker comprises multiple reactive epoxy groups, said ceramic composite layer being adapted to at least block dendrite growth and to prevent electronic shorting;
and at least one polyolefinic microporous layer being adapted to block ionic flow between an anode and a cathode at shutdown temperature;
wherein the polymeric binder comprises a polylactam of Formula (1):
wherein R1, R2, R3, and R4 are alkyl or aromatic substituents and R5 is
alkyl, aryl, or fused ring; and, wherein the polylactam is a homopolymer or a co-polymer where co-polymeric group X is derived from vinyl, a substituted or un-substituted alkyl vinyl, vinyl alcohol, vinyl acetate, acrylic acid, alkyl acrylate, acrylonitrile, maleic anhydride, maleic imide, styrene, polyvinylpyrrolidone (PVP), polyvinylvalerolactam, polyvinylcaprolactam (PVCap), polyamide, or polyimide; wherein m can be an integer between 1 and 10,
and wherein the ratio of l to n is such that 0≤l:n≤10.