All-Solid-State Battery Binder Slurry for Stable Wet Processing
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Solution Overview
Problem
Conventional all-solid-state batteries face challenges in manufacturing complexity due to a dry process, leading to low price competitiveness, and require a binder that is chemically stable with a sulfide-based solid electrolyte while maintaining good adhesion.
Innovation Solution
A polymer binder solution with an ester group is used, which undergoes pyrolysis to express a polar carboxylic acid functional group, enhancing adhesion through hydrogen bonding and polar-polar interactions, allowing a wet process and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-polar binder is used to suppress chemical reactivity with sulfide-based solid electrolyte, then chemical stability is improved, but adhesion to electrode or solid electrolyte layer deteriorates
Solution Approach 1:
The patent applies preliminary action by introducing a polar binder component before the binder contacts the sulfide-based solid electrolyte. The polar binder is designed to form a protective interface layer that prevents direct contact between the non-polar main binder and the reactive solid electrolyte, thereby preventing harmful chemical reactions in advance while maintaining good adhesion properties
Solution Approach 2:
The patent uses composite materials by combining polar and non-polar binder components in a specific ratio. The polar component provides chemical stability and compatibility with the solid electrolyte, while the non-polar component provides adhesion. This composite binder system achieves both chemical stability and good adhesion simultaneously
2Device complexity
If a dry process is used for manufacturing all-solid-state battery, then manufacturing complexity is reduced, but price competitiveness deteriorates
Solution Approach 1:
The patent applies hydraulics by using a liquid slurry formulation instead of a dry powder process. The slurry contains binder, solvent, and electrode materials in a liquid medium that enables simple coating processes such as doctor blade coating or spray coating, significantly reducing manufacturing complexity and enabling scalable production at lower costs
Solution Approach 2:
The patent changes the physical state parameter of the binder system from dry powder to liquid slurry by adding appropriate solvents. This parameter change enables the use of simple wet coating techniques instead of complex dry processing equipment, thereby reducing manufacturing complexity and improving price competitiveness
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 ensures chemical stability and improved adhesion between electrode materials, enabling a cost-effective wet process with high energy density and power output.
Implementation Method 1
a polymer binder which undergoes pyrolysis to express a polar carboxylic acid functional group, thereby inducing hydrogen bonding between the binder and the electrode material
Data Source
AI summary
A binder solution for an all-solid-state battery, an electrode slurry for an all-solid-state battery including the same and a method of manufacturing an all-solid-state battery using the same, and more particularly to a binder solution for an all-solid-state battery, in which a polymer binder configured such that a non-polar functional group is bonded to the end of a polar functional group is used, whereby the polar functional group is provided by a deprotection mechanism of the polymer binder through a thermal treatment, thus increasing adhesion between electrode materials to thereby improve battery capacity and enabling a wet process to thereby reduce manufacturing costs, an electrode slurry for an all-solid-state battery including the same and a method of manufacturing an all-solid-state battery using the same.