Solid-State Battery Electrolyte Ratio for Short-Circuit Suppression
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Solution Overview
Problem
Existing solid-state batteries face short circuits due to the penetration of the anode layer through the solid electrolyte layer, which is not effectively addressed by existing technologies, and increasing the electrolyte thickness to prevent this reduces the battery's volume energy density.
Innovation Solution
A solid-state battery design with a specific ratio of solid electrolyte layer thickness to anode layer thickness (0.65 to 0.77) and a filling rate of 82.3% or more, combined with a pressing process under 400 MPa, to suppress short circuits without compromising energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the solid electrolyte layer is increased to prevent anode penetration, then short circuit is suppressed, but volume energy density decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness ratio of the solid electrolyte layer to the anode layer within 0.65 to 0.77, and controlling the filling rate at 82.3% or more. This optimized parameter range prevents anode penetration while maintaining high volume energy density, resolving the contradiction between reliability and energy density
Solution Approach 2:
The patent implements preliminary anti-action by applying a pressing treatment during the manufacturing process that pre-compresses the solid electrolyte layer. This preliminary compression prevents subsequent anode penetration and short circuits without requiring excessive electrolyte thickness, thus maintaining energy density while ensuring short circuit suppression
2Reliability
If the filling rate of the solid electrolyte layer is increased to suppress short circuit, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The patent controls the filling rate parameter within a specific range (82.3% or more) to achieve short circuit suppression. By defining this parameter boundary, the patent simplifies the manufacturing process while ensuring reliability, as manufacturers only need to meet this quantitative threshold rather than dealing with complex process variations
3Reliability
If the thickness ratio of solid electrolyte layer to anode layer is optimized to suppress short circuit, then reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines a specific thickness ratio range (0.65 to 0.77) that balances short circuit suppression with manufacturing feasibility. This quantitative parameter specification provides clear manufacturing guidelines while achieving the desired reliability, preventing both penetration and excessive complexity
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 proposed design effectively reduces short circuits while maintaining or enhancing the battery's volume energy density, as demonstrated by high yield rates in manufactured batteries.
Implementation Method 1
a solid-state battery in which the anode contains a Li element
Implementation Method 2
vacuum-sealing the stack with a laminate film and pressing them
Data Source
AI summary
To provide a solid-state battery configured to suppress a short circuit and a method for producing the solid-state battery. A solid-state battery, wherein the solid-state battery comprises a cathode layer, an anode layer, and a solid electrolyte layer disposed between the cathode layer and the anode layer; wherein the anode layer comprises at least one of a lithium metal or a lithium alloy; wherein a ratio of a thickness of the solid electrolyte layer to a thickness of the anode layer is 0.65 or more and 0.77 or less; and wherein a filling rate of the solid electrolyte layer is 82.3% or more.