Solid-State Battery Cathode Binder Orientation for Crack Resistance
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Solution Overview
Problem
The positive electrode active material layer in all-solid state batteries is brittle, leading to potential short circuits, and increasing the binder content to enhance strength results in decreased energy density and output.
Innovation Solution
The orientation rate of the binder in the positive electrode active material layer is set to 60% or higher for a direction perpendicular to the laminating direction, enhancing the layer's strength without significantly reducing energy density or output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the content of binder in the positive electrode active material layer is increased to improve strength, then the strength is improved, but the energy density and energy output decrease
Solution Approach 1:
The invention changes the orientation parameter of the binder from random distribution to highly oriented arrangement perpendicular to the laminating direction. This parameter change allows the binder to provide maximum strength with minimum content, achieving tensile strength of 0.08 N/cm or more while maintaining energy density above 4.0 Wh/L and energy output above 1.5 kW/h, thus resolving the contradiction between strength improvement and energy density preservation
2Reliability
If the content of binder in the positive electrode active material layer is increased to prevent cracks and collapses, then the reliability is improved, but the energy output decreases
Solution Approach 1:
The invention changes the spatial arrangement parameter of the binder to achieve high orientation (orientation rate ≥60%) perpendicular to the laminating direction. This creates a robust structural framework that prevents cracks and collapses during charge and discharge cycles, achieving reliability improvement with minimal binder content, thus maintaining energy output above 1.5 kW/h
Data Source
AI summary
A means capable of improving the strength of a positive electrode active material layer while suppressing the decrease in energy density and energy output at a minimum in an all-solid state battery including a positive electrode active material layer containing a binder. A all-solid state battery including a power generating element including: a positive electrode including a positive electrode active material layer containing a positive electrode active material and a binder; a negative electrode; and a solid electrolyte layer containing a solid electrolyte and intervening the positive electrode and the negative electrode, wherein the orientation rate of the binder contained in the positive electrode active material layer for the direction perpendicular to the laminating direction of the power generating element is 60% or higher.