Oxide Solid-State Battery Mixture Sheet Without Solvent Degradation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for producing solid-state secondary battery mixtures using solvents degrade the oxide-based solid-state electrolyte, leading to decreased battery performance due to solvent interactions and processing defects, and are limited by the volatility and handling challenges of low-polarity solvents.
Innovation Solution
The use of a fibrillatable resin, such as polytetrafluoroethylene (PTFE), as a binder in a solvent-free process to form a secondary battery mixture with a fine fiber structure, which binds powder components without the need for a slurry, reducing moisture content and solvent-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a solvent is used to prepare slurry for coating, then the binder can be applied to the electrode mixture, but the oxide-based solid-state electrolyte degrades due to solvent interactions
Solution Approach 1:
The invention extracts and eliminates the solvent component from the conventional slurry preparation process. By using a solvent-free dry mixing process, the binder is applied directly to the electrode mixture without requiring a liquid carrier, thereby preventing solvent-induced degradation of the oxide-based solid-state electrolyte while maintaining manufacturing feasibility.
Solution Approach 2:
The invention changes the physical state parameter of the binding system from liquid-based (slurry) to dry powder form. This parameter change eliminates the solvent medium that causes electrolyte degradation, while the binder still achieves effective adhesion through direct contact and compression during electrode formation.
2Ease of manufacture
If low-polarity solvents are used, then binder dissolution is achieved, but handling becomes difficult due to volatility and processing defects
Solution Approach 1:
The invention removes the low-polarity solvent from the binder application process entirely. By using a dry mixing approach where the binder is applied as a powder without solvent dissolution, the handling difficulties associated with volatile low-polarity solvents are eliminated while binder application remains effective.
3Ease of manufacture
If conventional binder methods are used, then electrode formation is achieved, but moisture content increases leading to processing defects
Solution Approach 1:
The invention extracts and eliminates moisture-introducing components from the electrode formation process. By using a solvent-free dry mixing method with low-moisture binder powder, the source of excess moisture is removed, preventing processing defects while maintaining effective electrode formation through direct compression and binding.
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
This approach results in a secondary battery with improved ion conduction and performance by avoiding solvent-related degradation and processing defects, while maintaining flexibility and strength through controlled fibril diameter and content of the binder.
Implementation Method 1
a fibrillatable resin, such as a polytetrafluoroethylene resin, is also used as a binder by fibrillating the resin
Data Source
AI summary
The present disclosure provides a secondary battery mixture containing an oxide-based electrolyte that has good properties, a secondary battery mixture sheet containing the mixture, and a solid-state secondary battery using the secondary battery mixture sheet. In addition, the present disclosure provides a method for producing a secondary battery mixture sheet that contains a binder having a fine fiber structure. The secondary battery mixture contains an oxide-based solid-state electrolyte and a binder, wherein the binder is a fibrillatable resin. The fibrillatable resin preferably has a fibrous structure with a fibril diameter (median value) of 100 nm or less.