Solid State Battery Electrode Consolidation
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Solution Overview
Problem
Solid state batteries face challenges in achieving satisfactory battery characteristics due to high resistance caused by insufficient contact between the negative electrode layer and the solid electrolyte, and external pressure application increases costs and reduces energy density.
Innovation Solution
A solid state battery design with a solid electrolyte layer between the negative and positive electrode layers, consolidated under hydrostatic pressure to maintain a porosity of 3% or less, ensuring sufficient contact and reduced resistance without the need for external pressure structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external pressure is applied to improve contact between electrode layers and solid electrolyte, then contact resistance is reduced, but device complexity and manufacturing cost increase due to pressure application structures
Solution Approach 1:
The patent applies preliminary consolidation pressure during the battery assembly process to achieve sufficient contact between electrode layers and solid electrolyte before the battery enters service. This preliminary action eliminates the need for continuous external pressure structures during operation, resolving the contradiction between reducing contact resistance and avoiding device complexity.
2Reliability
If external pressure is applied to consolidate battery components, then contact resistance is reduced, but energy density decreases due to the volume occupied by pressure application structures
Solution Approach 1:
The consolidation process is performed as a preliminary step during manufacturing, applying pressure only temporarily during assembly. This allows achieving low contact resistance without requiring permanent pressure structures that would occupy volume and reduce energy density during battery operation.
3Object-affected harmful factors
If solid electrolyte layer is used instead of liquid electrolyte, then safety is improved by eliminating combustible solvents, but contact resistance increases due to insufficient contact between solid components
Solution Approach 1:
The patent applies consolidation pressure during assembly to ensure intimate contact between the solid electrolyte layer and electrode layers before the battery begins operation. This preliminary consolidation action resolves the inherent contact issues of solid-state components while maintaining the safety advantages of using non-combustible solid electrolyte.
Solution Approach 2:
The patent changes the physical state of the electrolyte from liquid to solid, fundamentally altering the system's safety characteristics by eliminating combustibility. This parameter change is accompanied by consolidation processing to maintain electrical contact, thus resolving the contradiction between safety improvement and contact resistance.
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 design enhances safety by eliminating combustible organic solvents, reduces cell resistance, and maintains high energy density while lowering the risk of fires, with improved battery characteristics and cost-effectiveness.
Implementation Method 1
a solid electrolyte layer disposed between the negative electrode layer and the positive electrode layer
Implementation Method 2
pressing the laminate to consolidate the laminate
Data Source
AI summary
A solid state battery includes: a negative electrode layer including a negative electrode active material; a positive electrode layer including a positive electrode active material; and a solid electrolyte layer installed between the negative electrode layer and the positive electrode layer, wherein the solid electrolyte layer contacts the negative electrode layer and the positive electrode layer, and wherein the solid state battery satisfies Equation 1:{(Vp−V980)/Vp×100}≦3% Equation 1wherein Vp is a total volume of the negative electrode layer, the positive electrode layer, and the solid electrolyte layer, and V980 is a total volume of the negative electrode layer, the positive electrode layer, and the solid electrolyte layer under the total pressure of about 980 megapascals.