Electrochemical Device Silane Coupling Agent Binding
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Solution Overview
Problem
All-solid secondary batteries with solid electrolyte and electrode layers formed using organic polymer binders face issues of increased electrode resistance and decreased ion conductivity, leading to reduced battery capacity and practicality due to the polarized state of organic polymers affecting ion and electron pathways.
Innovation Solution
The electrochemical device incorporates a mixture material with binder particles that have an organic polymer binder carried on their surface, improving binding strength between particles and reducing electrochemical reaction inhibition, specifically using a lithium-ion-conducting or silver-ion-conducting solid electrolyte with crystalline and amorphous sulfide-based materials to enhance ion conductivity and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If organic polymer binders are used in electrode layers and solid electrolyte layers, then binding strength between particles is improved, but electrode resistance increases and ion conductivity decreases
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance between the organic polymer binder and inorganic particles (electrode active material, electrolyte particles, carbon particles). The silane coupling agent forms a transition layer that reduces the polarized state of the organic polymer, thereby maintaining binding strength while preventing severe decrease in ion conductivity and electrode resistance. This mediator resolves the contradiction by allowing the organic binder to fulfill its binding function without excessively polarizing and blocking ion/electron pathways.
2Strength
If organic polymer binders are used to form electrode layers, then mechanical strength is improved, but electrode resistance increases severely
Solution Approach 1:
The silane coupling agent acts as a mediator between the organic polymer binder and inorganic particles in the electrode layer. It forms a transition layer that reduces the polarized state of the organic polymer, thereby maintaining mechanical binding strength while preventing severe increase in electrode resistance. The coupling agent allows electron and ion pathways to remain open while still providing structural integrity.
3Strength
If organic polymer binders are used in solid electrolyte layers, then mechanical strength is improved, but ion conductivity decreases severely
Solution Approach 1:
The silane coupling agent serves as a mediator between the organic polymer binder and inorganic electrolyte particles in the solid electrolyte layer. It forms a transition layer that significantly reduces the polarized state of the organic polymer, thereby maintaining mechanical strength while preventing severe decrease in ion conductivity. This allows the solid electrolyte layer to maintain both structural integrity and ion transport capability.
4Reliability
If binder particles with surface-carried organic polymer are used, then binding strength is improved and electrochemical reaction inhibition is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-coating the inorganic particles (electrolyte particles, electrode active material particles, carbon particles) with the silane coupling agent before mixing with the organic polymer binder. This preliminary treatment of the particle surfaces reduces the polarized state of the organic polymer when it binds to the particles, thereby improving electrochemical reaction characteristics while maintaining a relatively simple manufacturing process.
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
This approach prevents severe increases in electrode resistance and decreases in ion conductivity, resulting in improved charge-discharge properties and extended cycle life for all-solid secondary batteries.
Implementation Method 1
a silane coupling agent is used as a transition layer between the organic polymer binder and inorganic particles
Implementation Method 2
each of the binder particles including the second particle and the binder carried on at least a part of a surface thereof
Implementation Method 3
use of a lithium-ion-conducting inorganic solid electrolyte makes it possible to develop an all-solid lithium battery that exhibits improved safety
Data Source
AI summary
An electrochemical device manufactured using an electrode layer in which severe increase of electrode resistance is prevented and/or a solid electrolyte layer in which severe decrease of ion conductivity of a solid electrolyte is prevented is provided. The electrochemical device includes a pair of electrode layers, and a solid electrolyte layer provided between the pair of electrode layers, wherein at least one layer of the electrode layers and the solid electrolyte layer is composed of first particles each providing a function of the at least one layer, second particles and a binder which is composed of an organic polymer and binds the first and second particles, and wherein the at least one layer is formed from a mixture material containing the first particles and binder particles, each of the binder particles including the second particle and the binder carried on at least a part of a surface thereof.