Patent ID: 11862812
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A composite separator comprising:
a porous substrate; and
a coating layer on at least one surface of the porous substrate,
wherein the coating layer comprises a water-soluble binder and inorganic particles,
the water-soluble binder comprises a polyacrylic acid metal salt,
the polyacrylic acid metal salt has a weight average molecular weight of 300,000 Dalton to 450,000 Dalton, and
the inorganic particles have an average particle diameter (D50) of about 500 nm or more,
wherein the polyacrylic acid metal salt comprises a polyacrylic acid lithium salt, and
wherein the polyacrylic acid metal salt comprises an acrylic acid repeating unit substituted with lithium ions and an acrylic acid repeating unit, and a mole ratio of the acrylic acid repeating unit substituted with lithium ions to the acrylic acid repeating unit included the polyacrylic acid metal salt is from about 0.3 to about 0.9.