TFE Binder Composition for Low-Gas Secondary Battery Electrodes
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Solution Overview
Problem
Existing secondary batteries face challenges in achieving higher energy densities while minimizing gas generation and deterioration of electrochemical device characteristics, and there is a need for improved mixture sheet strength and flexibility in electrochemical devices.
Innovation Solution
A tetrafluoroethylene-based polymer composition is developed, containing specific compounds and being substantially free from water, which enhances mixture sheet strength, reduces gas generation, and improves electrochemical device characteristics by using a hydrocarbon surfactant to form a binder that can be used in electrodes and secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional binders are used in secondary batteries, then the basic binding function is achieved, but gas generation occurs and electrochemical device characteristics deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using a tetrafluoroethylene-based polymer with specific fluorine-containing groups instead of conventional binders. This parameter change eliminates gas generation while maintaining binding functionality, directly resolving the contradiction between reliability and harmful factors.
Solution Approach 2:
The patent creates a composite binder system by combining the tetrafluoroethylene-based polymer with specific additives and dispersants. This composite material approach maintains the binding function while eliminating gas generation, resolving the contradiction between reliability and harmful factors.
2Ease of manufacture
If dispersion media are used to prepare electrode mixtures, then the mixture can be processed, but large amounts of dispersion media are required which increases complexity and cost
Solution Approach 1:
The patent extracts and eliminates the need for dispersion media from the electrode mixture preparation process. The tetrafluoroethylene-based binder enables direct mixing of electrode components without requiring external dispersion media, thereby reducing device complexity while maintaining ease of manufacture.
Solution Approach 2:
The binder itself provides the dispersion and binding functions that previously required separate dispersion media. The tetrafluoroethylene-based polymer structure enables it to self-disperse electrode materials and maintain mixture processability without additional chemicals, resolving the contradiction between ease of manufacture and device complexity.
3Strength
If polytetrafluoroethylene is used as a binder, then binding function is achieved, but mixture sheet strength is insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of the polytetrafluoroethylene binder by introducing specific fluorine-containing groups and adjusting the polymer chain structure. These parameter changes enhance the binder's adhesion and cohesion properties, thereby improving mixture sheet strength while maintaining binder effectiveness.
Solution Approach 2:
The patent develops a composite binder formulation by combining modified polytetrafluoroethylene with specific additives that enhance sheet strength. This composite approach maintains the fundamental binding function while significantly improving mixture sheet strength, resolving the contradiction between strength and binder effectiveness.
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 effectively reduces gas generation, improves mixture sheet strength, and enhances electrochemical device characteristics, allowing for higher energy density and flexibility in secondary batteries without the need for large amounts of dispersion media.
Implementation Method 1
a tetrafluoroethylene-based polymer composition for use in an electrochemical device binder, containing: a tetrafluoroethylene-based polymer; and at least one compound selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the following formula (2)
Data Source
AI summary
A TFE-based polymer composition for an electrochemical device binder for reducing or preventing gas generation inside an electrochemical device cell and deterioration of electrochemical device characteristics and improve the mixture sheet strength. A TFE-based polymer composition for use in an electrochemical device binder, containing: a TFE-based polymer; and at least one compound represented by formula (1) or compound represented by formula (2), the tetrafluoroethylene-based polymer composition being substantially free from water:wherein m is 4 to 20; M1 is H, a metal atom, NR54 (where R5s are optionally the same or different from each other and each represent H or a C1-C10 organic group), or the like; and p is 1 or 2, andwherein n is 4 to 20; M2 is H, a metal atom, NR54 (where R5 is as defined above), or the like; and q is 1 or 2.