Patent ID: 11955660
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A separator for a lithium secondary battery, comprising:
a porous substrate;
a heat resistant layer disposed on at least one surface of the porous substrate, and including inorganic particles, wherein the heat resistant layer is prepared from a heat resistant layer coating liquid having a viscosity of 100 cp to 1000 cp;
a water-soluble polymer and a polyvinyl alcohol-based auxiliary binder, wherein the water-soluble polymer comprises an acryl-based binder, a cellulose-based binder, a vinylidenefluoride-based binder, or a combination thereof; and
a first adhesive layer disposed on the heat resistant layer and including a first organic polymer,
wherein the heat resistant layer includes 90 wt % to 99 wt % of the inorganic particles relative to a total weight of the heat resistant layer,
wherein a thickness of the heat resistant layer is 3.5 μm to 7 μm,
wherein a thickness of the first adhesive layer is 0.5 μm to 3.0 μm,
wherein a surface roughness of an interface formed between the heat resistant layer and the first adhesive layer is 1.0 μm to 4.0 μm,
wherein a surface roughness of one surface of the first adhesive layer exposed to the outside is 0.1 μm to 1.0 μm, and
wherein a peel strength between the electrodes and the separator is 0.1 gf/mm to 2.0 gf/mm.