Electrode Binder Composition for Lithium-Ion Battery Oxidation Resistance
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Solution Overview
Problem
Existing electrode binder compositions for lithium-ion batteries face issues with maintaining adhesion and oxidation resistance, leading to deteriorated charge-discharge characteristics over repeated cycles, and insufficient storage stability.
Innovation Solution
A novel electrode binder composition incorporating fluorine-containing polymer particles with specific repeating units derived from ethylene-based monomers and unsaturated carboxylic acid esters, combined with a compound represented by a general formula, to enhance adhesion and oxidation resistance while maintaining charge-discharge characteristics.
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 invention 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.
Solution Approach 2:
The invention introduces polymers with specific local functional groups (carboxylic acid groups) into the binder composition to locally enhance adhesion properties. The fluorine-containing polymer provides oxidation resistance in the bulk, while the carboxylic acid-containing polymer provides localized adhesion enhancement at the electrode interface.
2Strength
If a (meth)acrylic acid polymer is used as a binder, then adhesion is improved, but oxidation resistance deteriorates
Solution Approach 1:
The invention combines (meth)acrylic acid polymer particles (providing adhesion) with fluorine-containing polymer particles (providing oxidation resistance). This composite binder system allows the adhesion-enhancing (meth)acrylic acid polymer to function without sacrificing oxidation resistance, as the fluorine-containing polymer compensates for the reduced oxidation resistance.
Solution Approach 2:
The (meth)acrylic acid polymer provides localized adhesion enhancement at the electrode binder interface, while the fluorine-containing polymer provides bulk oxidation resistance. This spatial separation of functions allows each polymer to optimize its specific role without compromising the other property.
3Strength
If polymer composition is controlled to improve adhesion, then charge-discharge characteristics deteriorate
Solution Approach 1:
The invention carefully controls the content parameters of different polymer components: fluorine-containing polymer particles (0.1-10 parts by mass), (meth)acrylic acid polymer particles (0.1-5 parts by mass), and other binder polymers (90-75 parts by mass). This precise parameter control allows adhesion to be improved while maintaining charge-discharge characteristics by preventing excessive binder content that would impede ion transport.
Data Source
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 compound represented by the following general formula (1), 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 5 to 500 ppm.wherein R1 and R2 independently represent a hydrogen atom, a halogen atom, or a monovalent alkyl group, and n is an integer from 0 to 5.