TFE Binder Composition for Strong Flexible Electrode Mixture Sheets
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Solution Overview
Problem
Existing electrochemical devices fail to achieve high energy density, high energy density, and high energy density, and are not suitable for use in portable electronic devices and in-vehicle power sources.
Innovation Solution
The use of a tetrafluoroethylene-based polymer composition as a binder in electrochemical devices, containing specific compounds, to enhance the strength and flexibility of electrochemical device mixtures, allowing for improved battery characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a small amount of binder is used in the electrochemical device mixture, then the energy density is improved, but the strength and flexibility of the mixture sheet deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by incorporating specific compounds (carboxylic acid compounds, hydroxyl compounds, or amine compounds) into the polytetrafluoroethylene binder system. This chemical modification allows the binder to maintain excellent adhesion and mechanical properties at reduced concentrations (0.3-8 mass%), thereby improving energy density while preserving mixture sheet strength and flexibility.
Solution Approach 2:
The patent creates a composite binder system by combining polytetrafluoroethylene with functional compounds (carboxylic acid, hydroxyl, or amine compounds). This composite approach leverages the low friction and chemical stability of PTFE while the added compounds provide enhanced adhesion and mechanical reinforcement, enabling the mixture sheet to achieve both high energy density and adequate mechanical strength with minimal binder content.
2Strength
If the binder content is increased to improve strength and flexibility, then the mixture sheet exhibits better mechanical properties, but the energy density deteriorates
Solution Approach 1:
The patent optimizes the binder composition by incorporating functional compounds that enhance adhesion efficiency. This allows the binder to achieve maximum mechanical reinforcement at lower concentrations, preventing the energy density deterioration that would normally result from increased binder content.
3Reliability
If conventional binders are used to ensure adequate mixing and adhesion, then the mixture maintains good mechanical integrity, but the battery characteristics and energy density are limited
Solution Approach 1:
The patent develops a composite binder system combining polytetrafluoroethylene with functional compounds (carboxylic acid, hydroxyl, or amine compounds). This composite structure maintains excellent adhesion and mechanical integrity while reducing binder content, thereby enabling higher active material loading and improved battery characteristics including enhanced energy density and electrochemical performance.
Solution Approach 2:
The patent modifies the binder's chemical composition by incorporating functional groups that enhance adhesion to active materials. This chemical parameter change allows the binder to maintain reliable mechanical integrity at reduced concentrations, enabling higher energy density without sacrificing mixture stability or adhesion quality.
Data Source
AI summary
An electrochemical device mixture with which a mixture sheet exhibiting excellent strength and excellent flexibility can be obtained even though the mixture contains only a small amount of binder. An electrochemical device mixture containing: an electrode active material and/or a solid electrolyte; and a binder, the binder containing a TFE-based polymer composition, the TFE-based polymer composition containing a TFE-based polymer and at least one compound selected from the group consisting of a compound represented by the formula (1) of the disclosure (H—(CF2)m-1—COO)pM1) and a compound represented by the formula (2) of the disclosure (H—(CF2)n—SO3)qM2), the binder being contained in an amount of 0.3% by mass or more and 8% by mass or less.