All-Solid Battery Electrode Material to Suppress Crystallization Shrinkage
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Solution Overview
Problem
The existing methods for forming electrode material layers on solid electrolyte layers in all-solid-state batteries can lead to volume contraction during crystallization, resulting in cracks and potential peeling off of the electrode layer, which compromises the battery's functionality.
Innovation Solution
The use of an electrode material that contains an active material precursor with an amorphous phase and active material crystals, which can be sintered together with a solid electrolyte and conductive agent, and optionally coated with an amorphous layer, to minimize volume contraction and enhance the electrode's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode material layer is formed by applying and firing a slurry containing amorphous glass powder, then the electrode layer can be created on the solid electrolyte, but volume contraction occurs during crystallization causing cracks and peeling
Solution Approach 1:
The invention changes the chemical composition parameters of the glass powder by adding specific amounts of ZnO (0.1-5 wt%) and B2O3 (0.1-5 wt%) to modify the crystallization behavior and reduce volume contraction during firing, thereby preventing cracks and peeling while maintaining ease of manufacture
Solution Approach 2:
The invention creates a composite electrode material system combining amorphous glass powder with specific metal oxides (ZnO, B2O3) and active material precursors, where the composite structure synergistically reduces volume contraction during crystallization while maintaining manufacturing simplicity
2Quantity of substance
If the amount of electrode active material or thickness of electrode material layer is increased to increase energy density, then energy density improves, but volume contraction becomes more significant causing cracks and peeling
Solution Approach 1:
The invention modifies the glass composition parameters (adding ZnO and B2O3) to reduce the coefficient of thermal expansion and volume contraction during crystallization, enabling increased active material content and layer thickness without compromising structural integrity or manufacturing precision
3Reliability
If the electrode material is finely powdered or conductive agent amount is increased to reduce internal resistance, then internal resistance decreases, but volume contraction becomes more significant causing cracks and peeling
Solution Approach 1:
The invention changes the glass powder composition by incorporating ZnO and B2O3 to suppress volume contraction during crystallization, allowing the use of finely powdered electrode material and increased conductive agent content without causing cracks or peeling, thereby reducing internal resistance while maintaining manufacturing precision
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 effectively suppresses volume contraction and crack formation in the electrode layer, preventing peeling off and maintaining the ion conduction interface, thereby improving the battery's performance and energy density.
Implementation Method 1
volume contraction may occur during crystallization of glass in the firing process
Implementation Method 2
the electrode layer obtained by sintering may peel off from the solid electrolyte layer
Data Source
AI summary
Provided is an electrode material for an all-solid-state battery less likely to cause volume contraction due to crystallization of an active material precursor. An electrode material for an all-solid-state battery contains: an active material precursor having an amorphous phase; and active material crystals.