Composition for binder of all-solid-state battery, and electrode and battery including the same
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Solution Overview
Problem
The sulfide-based solid electrolyte in all-solid-state batteries is prone to side reactions with nitrile-based binders, leading to increased resistance and decreased battery performance, especially at high temperatures.
Innovation Solution
A binder composition for all-solid-state batteries is developed, comprising a lithium salt and a nitrile-based polymer that are coordinated, with the lithium salt present in an amount of about 0.1 wt% to less than 1 wt% based on the total weight of the composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a nitrile-based binder is used for sulfide-based all-solid-state batteries, then the binder is easily soluble in nonpolar solvent and processability is improved, but side reactions occur during electrode preparation and battery evaluation, resulting in increased resistance and decreased battery performance
Solution Approach 1:
The patent introduces a polar aprotic solvent as an intermediary substance to dissolve the nitrile-based binder during electrode preparation. This solvent acts as a mediator that enables the binder to be properly dissolved and coated without causing harmful side reactions with the sulfide-based solid electrolyte, thus maintaining both processability and battery performance.
2Strength
If a nitrile-based binder is used in sulfide-based all-solid-state batteries, then mechanical properties are maintained, but side reactions occur at high temperatures, leading to increased resistance and reduced battery performance
Solution Approach 1:
The patent changes the chemical environment parameters by introducing a polar aprotic solvent system that modifies the interaction between the nitrile-based binder and sulfide-based solid electrolyte. This parameter change suppresses the harmful side reactions that occur at high temperatures while preserving the mechanical properties provided by the nitrile-based binder.
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 coordinated lithium salt and nitrile-based polymer binder suppresses side reactions with the sulfide-based solid electrolyte, enhancing charge-discharge efficiency and maintaining high mechanical properties of the battery electrodes.
Implementation Method 1
a binder composition for all-solid-state batteries is developed, comprising a lithium salt and a nitrile-based polymer that are coordinated
Data Source
AI summary
Provided is a composition for a binder of an all-solid-state battery, and more specifically, to a composition for a binder of an all-solid-state battery in that a lithium salt and a nitrile-based polymer are contained, the lithium salt and the nitrile-based polymer are coordinated, and an amount of the lithium salt is about 0.1 wt % and more, and less than about 1 wt % on the basis of the total weight of the composition.