Composite Active Material Carbon Penetrating Ion Conductive Oxide Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge is to enhance electron conductivity in composite active materials for solid state batteries while minimizing resistance, as ion conductive oxides like lithium niobate have low electron conductivity and can increase battery resistance when used as a coat layer.
Innovation Solution
A composite active material is developed with a thin coat layer of ion conductive oxide and carbon particles penetrating the coat layer, achieving favorable electron conductivity by controlling the coat layer thickness to less than 100 nm and using a fluidized bed coating method to ensure high adhesion and efficient carbon particle support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coat layer composed of ion conductive oxide is provided on the surface of the active material to restrain reaction between active material and solid electrolyte material, then reaction restraint is improved, but electron conductivity deteriorates due to low electron conductivity of the ion conductive oxide
Solution Approach 1:
The patent applies local quality by creating a dual-structure coat layer where only specific regions (islands) contain ion conductive oxide while other regions contain carbon particles. This localized distribution allows different parts of the coat layer to perform different functions: ion conductive oxide regions provide reaction restraint while carbon particle regions provide electron conductivity pathways, resolving the contradiction between protection and conductivity.
Solution Approach 2:
The patent uses composite materials by combining ion conductive oxide and carbon particles in a single coat layer structure. The composite structure integrates the beneficial properties of both materials: the ion conductive oxide provides chemical stability and reaction restraint, while the carbon particles provide electron conductivity, thus resolving the contradiction between reaction restraint and electron conductivity.
2Reliability
If the coat layer thickness is increased to improve reaction restraint, then reaction restraint is improved, but resistance increases due to low electron conductivity of the ion conductive oxide
Solution Approach 1:
The patent applies local quality by creating a dual-structure coat layer where only specific regions (islands) contain ion conductive oxide while other regions contain carbon particles. This localized distribution allows different parts of the coat layer to perform different functions: ion conductive oxide regions provide reaction restraint while carbon particle regions provide electron conductivity pathways, resolving the contradiction between protection and conductivity.
Solution Approach 2:
The patent uses carbon particles as intermediary elements that mediate between the ion conductive oxide and the active material. The carbon particles form conductive bridges through the coat layer, providing electron transport pathways that bypass the resistive ion conductive oxide regions, thus reducing overall resistance while maintaining reaction restraint.
3Loss of energy
If carbon particles are added to improve electron conductivity, then electron conductivity is improved, but adhesion between carbon particles and active material deteriorates
Solution Approach 1:
The patent applies preliminary action by forming the ion conductive oxide coat layer on the active material surface before adding carbon particles. This sequence ensures that the carbon particles adhere to the pre-formed oxide layer rather than directly to the active material, improving adhesion. The oxide layer acts as a bonding interface that secures the carbon particles in place while maintaining their conductive function.
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 approach results in a composite active material with low resistance and improved electron conductivity, effectively addressing the limitations of ion conductive oxides in solid state batteries.
Implementation Method 1
a coat layer with an average thickness of less than 100 nm, formed on a surface of the active material and composed of an ion conductive oxide
Implementation Method 2
a carbon particle penetrating the coat layer, formed on a surface of the active material
Data Source
AI summary
The problem to be solved by the present invention is to provide a composite active material having favorable electron conductivity. The present invention solves the problem by providing a composite active material comprising an active material, a coat layer with an average thickness of less than 100 nm, formed on a surface of the active material and composed of an ion conductive oxide, and carbon particles penetrating the coat layer, formed on a surface of the active material.