TFE Binder Composition for Homogeneous Battery Electrode Mixing
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Solution Overview
Problem
Existing secondary batteries face challenges in achieving higher energy densities and improved electrochemical device characteristics, with polytetrafluoroethylene-based binders often forming aggregates and requiring large amounts of dispersion media, which complicates the production process.
Innovation Solution
A tetrafluoroethylene-based polymer composition with specific endothermic peaks in differential scanning calorimetry, allowing homogeneous mixing with powder components and reducing aggregation, while minimizing the need for dispersion media, and providing enhanced strength and flexibility in electrode mixtures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polytetrafluoroethylene-based binder is used in electrochemical devices, then binding performance is improved, but aggregation occurs and dispersion media requirement increases
Solution Approach 1:
The patent modifies the molecular structure parameters of polytetrafluoroethylene by introducing copolymer units (such as hexafluoropropylene, perfluoropropyl vinyl ether, or perfluoromethyl vinyl ether) to change the polymer's physical properties. This structural parameter change reduces aggregation tendency and improves compatibility with powder components, thereby reducing dispersion media requirements while maintaining binding performance.
Solution Approach 2:
The patent creates composite binder materials by combining polytetrafluoroethylene with other fluoropolymer components in specific ratios. This composite approach leverages the complementary properties of different polymers to achieve both excellent binding performance and reduced aggregation, eliminating the need for complex dispersion processes.
2Reliability
If polytetrafluoroethylene-based binder is used in electrochemical devices, then binding performance is improved, but dispersion media amount increases
Solution Approach 1:
By changing the molecular parameters of polytetrafluoroethylene through copolymerization with specific fluorinated monomers, the patent reduces the polymer's tendency to aggregate and improves its wettability with powder components. This parameter modification enables effective binder performance with minimal or no dispersion media, directly addressing the reduction of substance quantity.
3Strength
If conventional polytetrafluoroethylene binder is used, then binding strength is achieved, but mixing homogeneity deteriorates
Solution Approach 1:
The patent introduces copolymer units with specific side chain structures into polytetrafluoroethylene, changing the polymer's surface properties and flexibility. These parameter changes improve the polymer's ability to uniformly coat and adhere to powder components while maintaining binding strength, thereby achieving both strong adhesion and homogeneous mixing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tetrafluoroethylene-based polymer composition achieves homogeneous mixing with electrode active materials and solid electrolytes, reducing the need for dispersion media, and enhances the strength and flexibility of electrode mixtures, thereby improving the performance of secondary batteries.
Implementation Method 1
the TFE-based polymer composition having endothermic peaks in a region (A) of 330° C. or higher and lower than 340° C. and in a region (B) of 340° C. or higher and 350° C. or lower in differential scanning calorimetry
Data Source
AI summary
Provided is a tetrafluoroethylene-based polymer composition for use in an electrochemical device binder, the tetrafluoroethylene-based polymer 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 tetrafluoroethylene-based polymer composition. The present invention relates to a tetrafluoroethylene-based polymer composition for use in an electrochemical device binder, the tetrafluoroethylene-based polymer composition having endothermic peaks in a region (A) of 330° C. or higher and lower than 340° C. and in a region (B) of 340° C. or higher and 350° C. or lower in differential scanning calorimetry.