Binder Composition for Lithium-Ion Battery Electrodes
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Solution Overview
Problem
Existing electrical storage device electrode binder compositions fail to achieve a balance between oxidation resistance and adhesion, leading to deteriorated charge-discharge characteristics and storage stability, particularly in lithium-ion batteries.
Innovation Solution
An electrical storage device electrode binder composition is developed, comprising polymer alloy particles formed from interpenetrating polymer networks (IPN) or diene polymer particles with specific repeating units, including vinylidene fluoride, tetrafluoropropylene, and unsaturated carboxylic acid esters, along with a carboxylic acid or its salt, to enhance adhesion and oxidation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PVDF is used as a negative electrode binder to improve oxidation resistance, then adhesion deteriorates
Solution Approach 1:
The patent combines PVDF particles with carboxylic acid-modified polyethylene particles to create a composite binder system. PVDF provides oxidation resistance while the carboxylic acid-modified polyethylene enhances adhesion to the electrode active material, resolving the contradiction between these two properties.
Solution Approach 2:
The invention uses a composite binder composition consisting of fluorine-containing polymer particles (PVDF) and carboxylic acid-modified polyethylene particles. This composite material integrates the oxidation resistance of PVDF with the adhesion properties of carboxylic acid-modified polyethylene, achieving both required properties simultaneously.
2Strength
If (meth)acrylic acid polymer is used as a negative electrode binder to improve adhesion, then oxidation resistance deteriorates
Solution Approach 1:
The patent combines carboxylic acid-modified polyethylene particles (providing adhesion) with PVDF particles (providing oxidation resistance). This merging of two different polymer systems allows the binder to simultaneously achieve both adhesion and oxidation resistance that neither polymer could provide alone.
3Reliability
If fluorine-containing organic polymer is used to achieve oxidation resistance, then adhesion is insufficient
Solution Approach 1:
The invention creates a composite binder system where fluorine-containing polymer particles (PVDF) are combined with carboxylic acid-modified polyethylene particles. The fluorine-containing polymer provides oxidation resistance while the carboxylic acid-modified polyethylene component provides the necessary adhesion to electrode active material, achieving both properties in a single binder composition.
Data Source
AI summary
An electrode binder composition that is used to produce an electrode used for an electrical storage device, includes (A) a polymer, (B) a carboxylic acid or a salt thereof, and (C) a liquid medium, and has a concentration of the carboxylic acid or a salt thereof (B) of 20 to 1000 ppm.