Battery Electrode Binder Composition for Peel Strength and Metal Deposition
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Solution Overview
Problem
Conventional binder compositions for non-aqueous secondary battery electrodes suffer from low peel strength and excessive metal deposition at the electrode surface after charging and discharging.
Innovation Solution
A binder composition comprising a polymer A with a THF-insoluble content of 60 mass% or less and a polymer B with a THF-insoluble content of 80 mass% or more, which are used in combination to enhance the peel strength and inhibit metal deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional binder composition (styrene-butadiene copolymer latex with high butadiene bond content) is used, then binding capacity is improved, but metal deposition at the electrode surface increases
Solution Approach 1:
The patent uses a composite binder system combining two polymers with different THF-insoluble content characteristics. Polymer A (lower crosslinking density) and Polymer B (higher crosslinking density) work together to provide both binding capacity and metal deposition inhibition, resolving the contradiction between strength and harmful effects
Solution Approach 2:
The patent changes the chemical composition parameters by controlling the THF-insoluble content of each polymer component. By adjusting the crosslinking density parameters within specific ranges (60-80% for Polymer A, 80-98% for Polymer B), the binder achieves optimal balance between binding capacity and metal deposition prevention
2Strength
If a polymer with high THF-insoluble content is used, then binding capacity is improved, but electrode flexibility and electrolyte penetration are reduced
Solution Approach 1:
The patent segments the binder function into two polymer components with different crosslinking densities. Polymer A with lower THF-insoluble content maintains porosity and electrolyte penetration, while Polymer B with higher THF-insoluble content provides binding capacity, dividing the functional requirements between separate components
Data Source
AI summary
Provided is a binder composition for a non-aqueous secondary battery electrode that can form an electrode that has excellent peel strength and for which metal deposition at the surface thereof after charging and discharging is inhibited. The binder composition contains a polymer A and a polymer B. The polymer A has a THF-insoluble content of 60 mass% or less and the polymer B has a THF-insoluble content of 80 mass% or more.