Patent ID: 11932752
Assignee: NORTHWESTERN UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC C  H | IPC C

Claim 0:
1. A composite film usable as a separator of an electrochemical device, comprising:
carbon-coated hexagonal boron nitride (hBN) nanosheets and at least one polymer, wherein said at least one polymer comprises one or more electrically insulating and electrochemically inert polymers, wherein the hBN nanosheets are uniformly dispersed within a matrix of said at least one polymer to achieve a porous microstructure with a porosity in a range of about 47-70%,
wherein the carbon-coated hBN nanosheets comprise exfoliated hBN nanosheets; and
wherein the exfoliated hBN nanosheets are formed from bulk hBN by a liquid-phase shear exfoliation process with a polymer stabilizer of ethyl cellulose, and followed by thermal pyrolysis, thereby resulting a carbon coating on the hBN nanosheets.