Solid Electrolyte Composition for Low-Resistance Battery Interfaces
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Solution Overview
Problem
All-solid state secondary batteries face challenges in maintaining low interface resistance and enhancing bonding properties between solid particles and electrode collectors, which affects ion conductivity and battery performance.
Innovation Solution
A solid electrolyte composition is developed using an inorganic solid electrolyte combined with polymer binder particles having a specific SP value and average particle diameter, along with a dispersion medium, to improve wettability and bonding between solid particles and collectors, thereby reducing interface resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If solid particles are used to form electrode active material layers and solid electrolyte layer, then battery structure stability is improved, but interface resistance between solid particles increases
Solution Approach 1:
The patent introduces a binder as an intermediary substance between solid particles (electrode active material and solid electrolyte). The binder fills the gaps between particles and creates conductive pathways, mediating the interface between solid particles to reduce contact resistance while maintaining the solid-state structure's stability.
Solution Approach 2:
The patent creates a composite material system combining solid particles (electrode active material and solid electrolyte) with binder material. This composite structure allows the benefits of solid-state batteries (high stability, high energy density) while mitigating the drawback of high interface resistance through the binder component.
2Quantity of substance
If solid particles are used to form electrode active material layers and solid electrolyte layer, then energy density is improved, but bonding property between solid particles and collector deteriorates
Solution Approach 1:
The binder acts as a mediator between solid particles and the current collector, improving adhesion. It creates strong bonding interfaces between the solid electrode material and the collector while maintaining the high energy density achieved through solid particle packing.
Solution Approach 2:
The binder creates a porous or networked structure that allows solid particles to be firmly attached to the collector while maintaining void spaces for ion transport. This structure enhances bonding strength without compromising the energy density provided by the solid particle arrangement.
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 effectively suppresses the increase in interface resistance and enhances bonding properties, leading to improved ion conductivity and overall battery performance in all-solid state secondary batteries.
Implementation Method 1
enhancing the bonding property between solid particles or between the solid particles and a collector
Data Source
AI summary
Provided are a solid electrolyte composition including an inorganic solid electrolyte, binder particles which include a polymer having an SP value of 10.5 cal1/2 cm−3/2 or more and have an average particle diameter of 10 nm or more and 50,000 nm or less, and a dispersion medium, a sheet for an all-solid state secondary battery, an electrode sheet for an all-solid state secondary battery, and an all-solid state secondary battery for which the same solid electrolyte composition is used, and methods for manufacturing the electrode sheet for an all-solid state secondary battery and the all-solid state secondary battery.