Solid Electrolyte Composition Binder System for All-Solid State Battery
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Solution Overview
Problem
All-solid state secondary batteries face challenges with defects such as chipping, cracking, and peeling during bending due to insufficient adhesion between solid particles, which affects ion conductivity and reliability, especially when using organic electrolytes.
Innovation Solution
A solid electrolyte composition comprising an inorganic solid electrolyte, a binder system with specific ratios of precipitating and non-precipitating components, and a hydrocarbon solvent, which enhances adhesion and ion conductivity while preventing defects during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a binder formed of a resin is added to improve binding properties between solid particles, then binding properties are improved, but resistance increases and ion conductivity decreases
Solution Approach 1:
The invention changes the chemical composition parameters of the binder by incorporating specific functional groups (carboxyl, hydroxyl, or amine groups with specific content ranges). This parameter change allows the binder to maintain both binding properties and ion conductivity, resolving the contradiction between strength and reliability.
Solution Approach 2:
The invention creates a composite binder system that combines resin components with specific functional groups. This composite material approach allows the binder to simultaneously achieve good binding properties between solid particles and maintain sufficient ion conductivity, resolving the trade-off between strength and reliability.
2Quantity of substance
If solid electrolyte layer and electrode active material layers are laminated under pressurization to increase energy density, then energy density increases, but defects such as cracking occur due to insufficient adhesiveness
Solution Approach 1:
The invention changes the chemical parameters of the binder by incorporating functional groups (carboxyl, hydroxyl, or amine groups) with specific content ranges. This chemical modification enhances the binding properties between solid particles, allowing the layers to withstand pressurization during lamination without cracking, thus resolving the contradiction between energy density and manufacturing precision.
3Productivity
If layers are bent with smaller bend radius to increase battery output, then battery output increases, but defects such as chipping, cracking, and peeling occur due to insufficient adhesion
Solution Approach 1:
The invention modifies the chemical composition parameters of the binder by incorporating functional groups (carboxyl, hydroxyl, or amine groups) with specific content ranges. This chemical parameter change significantly improves the binding properties and adhesion between layers, enabling the battery to withstand bending with smaller radii without defects, thus resolving the contradiction between productivity and reliability.
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 composition effectively suppresses defects and maintains high ion conductivity even after bending with a smaller bend radius, improving the reliability and performance of all-solid state secondary batteries.
Implementation Method 1
a binder (B) and a hydrocarbon solvent (C), wherein the binder (B) includes a component that precipitates and a component that does not precipitate when included in the hydrocarbon solvent (C)
Data Source
AI summary
A solid electrolyte composition includes: an inorganic solid electrolyte (A) having ion conductivity of a metal belonging to Group 1 or Group 2 in the periodic table; a binder (B); and a dispersion medium (C), in which the binder (B) includes a first binder (B1) that precipitates by a centrifugal separation process and a second binder (B2) that does not precipitate by the centrifugal separation process, the centrifugal separation process being performed in the dispersion medium (C) under a specific condition, and a content X of the first binder (B1) and a content Y of the second binder (B2) satisfy the following expression,0.10≤Y/(X+Y)≤0.80.