Solid Electrolyte Binder Particles for Battery Interface Resistance
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Solution Overview
Problem
All-solid state secondary batteries face challenges with interface resistance and binding properties between solid particles, leading to deteriorated battery performance due to insufficient contact and weak binding between inorganic solid electrolyte and active material layers.
Innovation Solution
A solid electrolyte composition is developed with binder particles having a specific particle size and polymer components, including an aliphatic hydrocarbon chain or siloxane structure, which are dispersed in a dispersion medium to enhance stability and bonding between solid particles, reducing interface resistance and improving binding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If binder particles are used to form solid electrolyte composition, then binding properties between solid particles are improved, but interface resistance increases due to insufficient contact between solid particles
Solution Approach 1:
The patent optimizes the average particle size of binder particles to 1 nm to 400 nm, which is a critical parameter change. This specific size range allows the binder particles to effectively bridge solid particles while maintaining sufficient contact between them, thereby improving binding properties without excessively increasing interface resistance
Solution Approach 2:
The patent creates a composite solid electrolyte composition consisting of inorganic solid electrolyte particles and binder particles. This composite structure combines the high ion conductivity of inorganic solid electrolytes with the binding capabilities of polymer particles, achieving both good binding properties and acceptable interface resistance
2Reliability
If inorganic solid electrolyte is used instead of organic electrolytic solution, then safety and reliability are improved, but interface resistance and binding properties deteriorate
Solution Approach 1:
The patent introduces binder particles as an intermediary material between inorganic solid electrolyte particles and active material particles. These binder particles mediate the interface contact, improving binding properties while allowing the inorganic solid electrolyte to maintain its safety advantages
Solution Approach 2:
The patent applies different materials with different properties to different locations: inorganic solid electrolyte particles provide safety and ion conductivity in the bulk, while binder particles provide binding properties at the interfaces between solid particles and active material
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 interface resistance and enhances binding between solid particles, resulting in improved battery performance with low resistance and strong bonding, maintaining excellent characteristics even under bending stress.
Implementation Method 1
binder particles having an average particle size of 1 nm to 400 nm... enhance stability and bonding between solid particles
Data Source
AI summary
A solid electrolyte composition includes: an inorganic solid electrolyte; binder particles having an average particle size of 1 nm to 10 μm; and a dispersion medium, in which the binder particles include a polymer that includes a component derived from a polymerizable compound having a molecular weight of lower than 1,000, and the component includes at least one of an aliphatic hydrocarbon chain to which 10 or more carbon atoms are bonded or a siloxane structure as a side chain of the polymer. The solid electrolyte composition is used in the sheet for an all-solid state secondary battery, the electrode sheet for an all-solid state secondary battery, the all-solid state secondary battery, the method of manufacturing a sheet for an all-solid state secondary battery, and the method of manufacturing an all-solid state secondary battery.