Self-Supporting Electrode Film Binder for Strength and Flexibility
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Solution Overview
Problem
Existing secondary batteries, such as lithium-ion batteries, face challenges in achieving higher energy densities and improved battery characteristics without compromising on strength and flexibility.
Innovation Solution
A self-supporting electrochemical device mixture film using a tetrafluoroethylene-based polymer composition with specific compounds, providing excellent strength and flexibility without a support, and incorporating a binder with a TFE-based polymer and selected compounds to enhance handling and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If polytetrafluoroethylene composite binder material is used to improve battery characteristics and energy density, then energy density is improved, but strength and flexibility may be compromised
Solution Approach 1:
The patent uses a composite binder material consisting of polytetrafluoroethylene (PTFE) combined with specific compounds (formula 1 and formula 2) to create a mixture that achieves both high energy density and excellent mechanical properties. The composite nature allows optimization of both electrochemical performance and structural integrity.
Solution Approach 2:
The patent optimizes the molecular structure parameters of the binder by specifying compounds with particular molecular weights (m=4 to 20, n=4 to 20) and functional groups. This parameter optimization enables the binder to achieve the right balance between flexibility for handling and strength for structural support while maintaining high energy density.
2Quantity of substance
If binder composition is optimized for high energy density, then energy density is improved, but handling properties may deteriorate
Solution Approach 1:
The patent specifies precise molecular weight ranges (m=4 to 20, n=4 to 20) and functional group compositions for the binder compounds to optimize the balance between energy density and handling properties. The molecular structure parameters are tuned to achieve appropriate flexibility and processability.
Solution Approach 2:
The patent introduces specific functional groups (imidazolium, pyridinium, phosphonium, or amino groups) at specific locations in the molecular structure to provide localized flexibility and handling improvement while maintaining the overall high energy density of the PTFE-based binder system.
Data Source
AI summary
A self-supporting electrochemical device mixture film exhibiting excellent strength and flexibility without a support. A self-supporting electrochemical device mixture film containing: at least one of an electrode active material 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 of formula (1) and a compound represented of formula (2):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 defined above), or the like; and q is 1 or 2.