Fluorinated Elastomer Binder for Soluble Solid-State Battery Slurries
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Solution Overview
Problem
Existing binders for sulfide-based solid-state batteries have low solubility in solvents, which limits their ability to form a satisfactory slurry for electrode production.
Innovation Solution
A fluorine-containing elastomer binder with specific resin end functional groups is used, which has excellent solubility in low-polarity solvents and provides good adhesion and flexibility, suitable for sulfide-based solid-state batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional binders are used in sulfide-based solid-state batteries, then adhesion and flexibility can be maintained, but solubility in solvents becomes insufficient
Solution Approach 1:
The patent modifies the chemical structure of the binder by introducing specific functional groups (carboxyl groups and/or hydroxyl groups) at the ends of the polymer chain. This parameter change in the molecular structure enables the binder to dissolve in low-polarity solvents while maintaining its adhesion and flexibility properties, thus resolving the contradiction between solubility and reliability.
2Ease of manufacture
If the binder structure is modified to improve solubility, then manufacturing ease increases, but adhesion and flexibility may deteriorate
Solution Approach 1:
The patent applies local quality modification by placing functional groups (carboxyl and/or hydroxyl groups) specifically at the end portions of the polymer chain rather than throughout the entire structure. This localized modification provides the necessary solubility in low-polarity solvents while preserving the main polymer structure's adhesion and flexibility characteristics.
3Adaptability or versatility
If conventional binders are used, then material availability is good, but slurry formation quality becomes insufficient
Solution Approach 1:
The patent creates a composite binder structure combining a fluoropolymer backbone (providing mechanical properties) with polar functional groups at the chain ends (providing solubility). This composite approach at the molecular level enables the formation of high-quality slurries with sulfide-based solid electrolyte particles while maintaining the availability of fluoropolymer materials.
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 binder achieves excellent solubility, adhesion, and flexibility, enabling the production of high-performance electrodes for sulfide-based solid-state batteries.
Implementation Method 1
the binder being a fluorine-containing elastomer in which resin end functional groups satisfy: 0.01≤([—CH2OH]+[—COOH])/([—CH3]+[—CF2H]+[—CH2OH]+[—CH2I]+[—OC(O)RH]+[—COOH]≤0.25
Data Source
AI summary
A binder and a slurry suitable for use in the production of an electrode in a sulfide-based solid-state battery. The binder contains sulfide-based solid electrolyte particles, and is a fluorine-containing elastomer in which resin end functional groups satisfy:0.01≤([—CH2OH]+[—COOH])/([—CH3]+[—CF2H]+[—CH2OH]+[—CH2I]+[—OC(O)RH]+[—COOH]≤0.25where R represents an alkyl group with 1 to 20 carbon atoms. Also disclosed is an electrode including an electrode active material layer formed using the slurry and a lithium-ion secondary solid state battery including the electrode.