TFE Binder Composition for Stronger Solid-State Battery Sheets
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Solution Overview
Problem
Existing secondary batteries, such as lithium-ion batteries, face challenges in achieving higher energy densities and maintaining battery characteristics without deterioration, particularly in the use of polytetrafluoroethylene composite binders.
Innovation Solution
A tetrafluoroethylene-based polymer composition is developed, incorporating specific compounds and modifying monomers, which enhances mixture sheet strength, reduces the need for water or organic solvents, and improves binding force to active materials, while allowing for a wide selection of electrode and electrolyte components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polytetrafluoroethylene composite binder is used in secondary batteries, then binding force to active materials is provided, but mixture sheet strength deteriorates and battery characteristics deteriorate
Solution Approach 1:
The invention changes the chemical structure parameters of the binder by introducing specific compounds (formulas 1 and 2) with defined molecular weights and functional groups into the polytetrafluoroethylene matrix, optimizing the balance between binding force and sheet strength through compositional parameter adjustment
Solution Approach 2:
The invention creates a composite binder material combining polytetrafluoroethylene base polymer with specific functional compounds (formulas 1 and 2), where the composite structure provides both adequate binding force to active materials and improved mixture sheet strength, resolving the contradiction between these two properties
Data Source
AI summary
The disclosure provides a TFE-based polymer composition for a solid-state secondary battery binder capable of improving the mixture sheet strength. Provided is a TFE-based polymer composition for use in a solid-state secondary battery binder, containing: a TFE-based polymer; and at least one compound selected from the group consisting of a compound represented by the formula (1) and a compound represented by the formula (2):wherein m is 4 to 20; M1 is H, a metal atom, NR54 (where R5s are optionally the same as 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.