Innovative Separator Design for Lithium Battery Durability
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Summary
Problems
The challenge is to prevent pore size reduction or closure in porous polymer substrates for lithium secondary battery separators during high-pressure lamination processes, which affects the adhesion and heat resistance of the separators.
Innovation solutions
A method involving coating a polymer solution soluble to an electrolyte into the porous polymer substrate, followed by a slurry containing a second polymer non-soluble to the electrolyte, which includes inorganic particles, to create a coating layer that maintains pore structure under high pressure, and subsequent drying to secure the layer.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If application pressure is increased to secure adhesion during lamination, then bonding force between electrode and separator is improved, but pores of separator are reduced in size or closed
Why choose this principle:
A coating layer is formed on the separator surface before the lamination process. This pre-formed coating layer acts as a protective barrier that prevents pore closure during subsequent high-pressure lamination, while still allowing adequate bonding between the separator and electrode.
Principle concept:
If application pressure is increased to secure adhesion during lamination, then bonding force between electrode and separator is improved, but pores of separator are reduced in size or closed
Why choose this principle:
The separator is constructed as a composite structure combining a porous polymer substrate with a coating layer containing inorganic particles and polymer. This composite structure provides both the adhesion needed for lamination and the pore structure needed for ion transport.
Application Domain
Data Source
AI summary:
A method involving coating a polymer solution soluble to an electrolyte into the porous polymer substrate, followed by a slurry containing a second polymer non-soluble to the electrolyte, which includes inorganic particles, to create a coating layer that maintains pore structure under high pressure, and subsequent drying to secure the layer.
Abstract
A method of manufacturing a separator for a lithium secondary battery having improved compression resistance is disclosed. According to one aspect of the present disclosure, there is a method of manufacturing a separator for a lithium secondary battery including the steps of coating a polymer solution prepared by dissolving a first polymer soluble in an electrolyte in a solvent to at least one surface of a porous polymer substrate having a plurality of pores, to impregnate the pores of the porous polymer substrate with the polymer solution; and coating and drying a slurry containing a second polymer non-soluble in the electrolyte, on the coated polymer solution.