Composite Electrolyte Sheet Processing for Strength Without Discoloration
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Solution Overview
Problem
Conventional secondary batteries using solid electrolytes often suffer from insufficient physical strength in the electrolyte layer, which affects battery performance.
Innovation Solution
A manufacturing method involving the use of Li[TFSI] as an electrolyte salt and shaping a composition containing a polymer, oxide particles, and a dispersion medium into a sheet shape at 100°C or higher, followed by volatilizing the dispersion medium, results in an electrolyte sheet with enhanced tensile strength and ionic conductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a solid electrolyte slurry is applied on a base material and dried to form a solid electrolyte layer, then the electrolyte layer can be formed, but the tensile strength of the electrolyte layer may be insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte layer by specifying Li[TFSI] as the electrolyte salt and defining precise compositional ratios (polymer 10-40 mass%, Li[TFSI] 30-70 mass%, oxide particles 5-30 mass%). It also changes the processing temperature parameter to 100°C or higher for volatilizing the dispersion medium, which transforms the physical and chemical properties of the electrolyte layer to achieve both high tensile strength and reliability
Solution Approach 2:
The patent creates a composite electrolyte layer by combining multiple components: polymer matrix, Li[TFSI] electrolyte salt, and oxide particles. This composite structure synergistically improves tensile strength through the polymer framework, ionic conductance through Li[TFSI], and structural stability through oxide particles, resolving the contradiction between strength and reliability
2Strength
If the dispersion medium is volatilized at high temperature to form the electrolyte sheet, then the tensile strength is improved, but discoloration may occur due to heating effect
Solution Approach 1:
The patent optimizes the volatilization temperature parameter to precisely 100°C or higher, which is sufficient to remove the dispersion medium and form a strong electrolyte sheet while remaining below the threshold that causes discoloration. This precise parameter control resolves the contradiction between achieving high strength and preventing thermal degradation
Solution Approach 2:
The patent uses Li[TFSI] as an intermediary substance that stabilizes the electrolyte composition during high-temperature volatilization of the dispersion medium. Li[TFSI] maintains chemical stability and prevents discoloration while allowing the formation of a strong electrolyte sheet structure, thus resolving the contradiction between strength improvement and discoloration prevention
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 method produces an electrolyte sheet with excellent tensile strength and ionic conductance, suitable for use as an electrolyte layer in secondary batteries, while suppressing discoloration due to high-temperature processing.
Implementation Method 1
volatilizing the dispersion medium at 100° C. or higher
Data Source
AI summary
An aspect of the present invention provides a manufacturing method for an electrolyte sheet, the manufacturing method including a step of molding a composition containing a polymer, Li[TFSI], oxide particles, and a dispersion medium into a sheet shape and volatilizing the dispersion medium at 100° C. or higher.