Battery Functional Layer Binder for Stable Dispersion and Heat Storage
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Solution Overview
Problem
Conventional binder and slurry compositions for non-aqueous secondary battery functional layers suffer from reduced dispersion stability and inadequate high-temperature storage characteristics, leading to suboptimal performance in secondary batteries.
Innovation Solution
A binder composition comprising two types of particulate polymers and a dispersion medium, with specific glossiness and pH ranges, forms a coating film that enhances dispersion stability and improves high-temperature storage characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional binder composition is used, then the functional layer can be formed, but dispersion stability is reduced due to aggregation and sedimentation of components
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by incorporating specific polymers (polyacrylic acid and polyvinylidene fluoride) in controlled ratios, and adjusts pH parameters to maintain dispersion stability. This resolves the contradiction by modifying compositional parameters to prevent aggregation while maintaining functional layer formation.
Solution Approach 2:
The patent uses a composite binder system combining polyacrylic acid and polyvinylidene fluoride polymers with specific particle size distributions. This composite approach improves dispersion stability by creating a synergistic effect where the different polymer components work together to prevent aggregation and sedimentation, while maintaining reliable performance.
2Reliability
If conventional slurry composition is used, then the functional layer can be formed, but high-temperature storage characteristics are inadequate
Solution Approach 1:
The patent changes the thermal stability parameters by selecting polymers with appropriate glass transition temperatures and thermal decomposition characteristics. The polyacrylic acid and polyvinylidene fluoride combination provides enhanced high-temperature stability while maintaining adhesiveness through controlled chemical composition and cross-linking density.
Solution Approach 2:
The patent introduces specific polymer components as intermediaries that mediate between the functional layer requirements and substrate adhesion needs. These polymers provide thermal stability while maintaining bonding capability, resolving the contradiction between high-temperature performance and adhesiveness.
3Stability of the object's composition
If the binder composition components are aggregated, then sedimentation occurs, but this reduces dispersion stability and performance
Solution Approach 1:
The patent changes the surface charge parameters and particle size distribution to optimize dispersion stability. By controlling pH and incorporating charge-stabilized polymer particles, the composition maintains uniformity without requiring complex stabilization mechanisms, resolving the contradiction between stability and simplicity.
Data Source
AI summary
Provided is a binder composition for a non-aqueous secondary battery functional layer that has excellent dispersion stability and is capable of forming a functional layer that can improve high-temperature storage characteristics of a secondary battery. The binder composition for a non-aqueous secondary battery functional layer contains a particulate polymer A, a particulate polymer B differing from the particulate polymer A, and a dispersion medium. A coating film obtained through application and drying of the binder composition for a non-aqueous secondary battery functional layer on a separator substrate made of polyethylene has an 86° glossiness of not less than 1 and not more than 70 and a 60° glossiness of less than 6.