Multi-Polymer Fluoropolymer Binder for Low-Media Electrode Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing secondary batteries face challenges in achieving higher energy densities and improved electrochemical device characteristics, with existing binders leading to aggregation issues and requiring large amounts of dispersion media, which complicates the production process.
Innovation Solution
A fluoropolymer composition comprising two or more tetrafluoroethylene-based polymers in a high concentration, allowing for homogeneous mixing with electrode active materials and solid electrolytes without the need for significant amounts of dispersion media, thereby enhancing strength and flexibility of the mixture sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional binders are used, then the binder can hold electrode materials together, but aggregation occurs and mixing homogeneity deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using fluoropolymer compositions with specific fluorine-containing monomer units (such as vinylidene fluoride, hexafluoropropylene, and perfluoropropyl vinyl ether) in controlled ratios. This parameter optimization prevents aggregation while maintaining binding strength, achieving both homogeneous mixing and effective electrode material consolidation.
Solution Approach 2:
The patent employs composite binder materials consisting of multiple fluoropolymer components with different functional characteristics. By combining polymers with varying flexibility, polarity, and binding properties, the composition achieves synergistic effects that prevent aggregation while maintaining strong adhesion to electrode materials.
2Stability of the object's composition
If dispersion media are used to improve mixing, then mixing homogeneity improves, but the production process becomes more complex
Solution Approach 1:
The patent extracts and eliminates the need for external dispersion media by incorporating all necessary binding and dispersing functions directly into the fluoropolymer binder composition. The binder itself provides sufficient dispersion capability through its molecular structure and surface properties, removing the separate dispersion media step from the production process.
Solution Approach 2:
The fluoropolymer binder composition performs multiple functions simultaneously: it binds electrode materials together, disperses them uniformly, and provides flexibility and strength. This multi-functional binder replaces what would traditionally require separate additives and dispersion media, simplifying the production process while maintaining mixing homogeneity.
3Strength
If fluoropolymer composition is optimized for strength, then binder strength improves, but flexibility may deteriorate
Solution Approach 1:
The patent optimizes the molecular weight distribution and monomer composition ratios of the fluoropolymer to achieve a balance between strength and flexibility. By controlling the content of specific monomer units and the overall polymer architecture, the binder attains adequate mechanical strength while maintaining the flexibility required for electrode deformation during battery cycling.
Solution Approach 2:
The patent creates a composite fluoropolymer system where different polymer components contribute distinct properties: some provide strength and adhesion, while others contribute flexibility and elasticity. This composite approach allows the binder to exhibit both high strength and adequate flexibility simultaneously, overcoming the trade-off between these properties.
Data Source
AI summary
Provided is a fluoropolymer composition for use in an electrochemical device binder, the fluoropolymer composition being homogenously mixable with powder components in electrochemical devices and being capable of providing a mixture sheet having excellent strength and excellent flexibility. Also provided are an electrochemical device binder, an electrode mixture, an electrode, and a secondary battery each containing the fluoropolymer composition. The present disclosure relates to a fluoropolymer composition for use in an electrochemical device binder, the fluoropolymer composition containing a fluoropolymer. The fluoropolymer contains two or more tetrafluoroethylene-based polymers. The fluoropolymer is contained in an amount of 90% by mass or more relative to the fluoropolymer composition