Enhanced Binder Design for Reliable Battery Separators
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Summary
Problems
Existing secondary battery binders suffer from poor adhesion with ceramic particles and electrode plates, leading to issues like 'powder falling' and reduced cycling performance, which limits the development of secondary battery performance.
Innovation solutions
A binder composition comprising a polymer with structural units derived from specific monomers and modified with silane coupling agent, applied to ceramic particles, enhancing adhesion between the separator and electrode plates.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a polyolefin-based separator is used to ensure chemical inertness and shutdown function, then battery safety is improved through shutdown at low temperature, but high-temperature membrane rupture resistance is insufficient above the melting point of polyolefin
Why choose this principle:
The patent uses a composite structure consisting of a polyolefin base layer combined with a silicon oxide coating layer. The polyolefin provides shutdown function at low temperature, while the silicon oxide layer provides high-temperature stability, creating a composite separator that achieves both low-temperature safety and high-temperature rupture resistance.
Principle concept:
If a polyolefin-based separator is used to ensure chemical inertness and shutdown function, then battery safety is improved through shutdown at low temperature, but high-temperature membrane rupture resistance is insufficient above the melting point of polyolefin
Why choose this principle:
The patent modifies the physical and chemical parameters of the separator by coating it with silicon oxide, changing the surface properties and thermal stability parameters. This allows the separator to maintain structural integrity at temperatures above the polyolefin melting point while retaining its shutdown function.
Application Domain
Data Source
AI summary:
A binder composition comprising a polymer with structural units derived from specific monomers and modified with silane coupling agent, applied to ceramic particles, enhancing adhesion between the separator and electrode plates.
Abstract
This application provides a binder including a polymer and ceramic particles modified with silane coupling agent, the polymer containing structural units derived from a first-type monomer, a second-type monomer, and a third-type monomer, and a molar ratio of the first-type monomer, the second-type monomer, and the third-type monomer being (50 to 58):(40 to 44):(2 to 6), where the first-type monomer is selected from one or more compounds of formula I; the second-type monomer is selected from one or more compounds of formula II; and the third-type monomer is selected from one or more compounds of formula III. The binder in this application has improved adhesion performance and can improve the cycling performance of secondary batteries.