Fluorine Binder Composition for Battery Adhesion and Oxidation
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Solution Overview
Problem
Existing electrode binder compositions for electrical storage devices face issues with maintaining adhesion and oxidation resistance, leading to deteriorated charge-discharge characteristics over repeated cycles, and insufficient storage stability.
Innovation Solution
A binder composition comprising fluorine-containing polymer particles with specific repeating units derived from ethylene-based monomers and unsaturated carboxylic acid esters, combined with diene polymer particles, which provide improved adhesion, oxidation resistance, and storage stability by forming a polymer alloy with a core-shell structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorine-containing organic polymer is used as a binder, then oxidation resistance is improved, but adhesion deteriorates
Solution Approach 1:
The patent uses a composite binder system combining fluorine-containing polymer particles (providing oxidation resistance) with carboxylic acid-containing polymer particles (providing adhesion). This composite approach allows both oxidation resistance and adhesion to be achieved simultaneously, resolving the contradiction between these two properties.
2Strength
If a rubber polymer is combined with fluorine-containing polymer to improve adhesion, then adhesion is improved, but oxidation resistance deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the binder by selecting specific carboxylic acid-containing polymers (such as polyacrylic acid, polymethacrylic acid, or their crosslinked products) with controlled molecular weights and carboxylic acid contents. This parameter optimization allows achieving both adhesion and oxidation resistance without the deterioration caused by rubber polymer combinations.
3Strength
If a binder with improved adhesion is used, then adhesion is improved, but charge-discharge characteristics deteriorate over time
Solution Approach 1:
The patent applies local quality by creating a binder system where different polymer components perform different functions: fluorine-containing polymers provide oxidation resistance for long-term stability, while carboxylic acid-containing polymers provide adhesion. This functional differentiation ensures both adhesion and stable charge-discharge characteristics over time.
Data Source
Figure 1
AI summary
An electrode binder composition is used to produce an electrode used for an electrical storage device, and includes (A) a polymer, (B) a (meth)acrylate compound, and (C) a liquid medium, the polymer (A) being fluorine-containing polymer particles or diene polymer particles, and a concentration of the compound (B) in the electrode binder composition being 10 to 1,000 ppm.