Solid Electrolyte Membrane Solvent Pairing for Uniform Binder Distribution
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Solution Overview
Problem
Existing all-solid-state rechargeable batteries face issues with non-uniform binder distribution in solid electrolyte membranes, leading to reduced durability and high-rate charging performance due to uneven adhesion with electrodes.
Innovation Solution
A solid electrolyte membrane is formulated with a combination of solvents and binders, where a first solvent with higher volatility and a second solvent with lower volatility are used to achieve uniform binder distribution, resulting in improved adhesion and durability by concentrating the binder on the surface in contact with the positive electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single solvent is used in the solid electrolyte membrane formulation, then the manufacturing process is simple, but the binder distribution becomes non-uniform leading to reduced durability and high-rate characteristics
Solution Approach 1:
The single solvent system is segmented into two distinct solvents with different volatilities. The first solvent (higher volatility) and second solvent (lower volatility) work in sequence during the drying process to achieve uniform binder distribution. This segmentation resolves the contradiction by maintaining manufacturing simplicity while eliminating the non-uniform binder distribution that harms reliability.
Solution Approach 2:
The invention changes the physical parameter of the solvent system by using two solvents with different volatility parameters rather than a single solvent. This parameter change allows controlled evaporation rates that ensure uniform binder distribution throughout the solid electrolyte membrane, thereby improving durability and high-rate characteristics without significantly complicating the manufacturing process.
2Strength
If binder is uniformly distributed throughout the solid electrolyte membrane, then adhesion is improved, but manufacturing complexity increases due to the need for controlled solvent evaporation
Solution Approach 1:
By changing the volatility parameter of the solvents used in the formulation, the invention achieves uniform binder distribution through natural evaporation differences rather than complex manufacturing controls. The first solvent evaporates faster, allowing the second solvent to carry binder uniformly to the surface, thereby improving adhesion without significantly increasing manufacturing complexity.
3Reliability
If high binder content is used to improve adhesion, then durability improves, but the ionic conductivity of the solid electrolyte membrane decreases
Solution Approach 1:
The invention applies local quality by concentrating the binder primarily on the surface of the solid electrolyte membrane rather than uniformly throughout the bulk. This is achieved through the differential evaporation of the two solvents, where the less volatile second solvent carries the binder to the surface. This local concentration improves adhesion and durability while maintaining high ionic conductivity in the bulk electrolyte region.
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 solution enhances the durability and high-rate charging capabilities of the battery by ensuring even binder distribution, thereby improving adhesion and maintaining electrochemical characteristics.
Implementation Method 1
a first solvent with higher volatility and a second solvent with lower volatility are used to achieve uniform binder distribution
Data Source
AI summary
Disclosed are a solid electrolyte membrane, and an all-solid-state rechargeable battery, the solid electrolyte membrane including a sulfide-based solid electrolyte, a binder, a first solvent, and a second solvent, wherein the first solvent is at least one selected from butyl butyrate, isobutyl isobutyrate, tetrahydrofuran, and ethyl acetate and the second solvent is at least one selected from hexyl butyrate, benzyl butyrate, benzyl isobutyrate, isopentyl butyrate, and octyl acetate.