All-Solid-State Battery Laminate Pressure Buffer for Cycle Stability
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Solution Overview
Problem
Existing all-solid state secondary batteries face challenges in maintaining cycle characteristics, discharge load characteristics, and high-speed charging characteristics due to the difficulty in achieving a specific pressurized state with a laminate configuration of positive electrode, solid electrolyte, and negative electrode layers.
Innovation Solution
The battery design involves a laminate structure where the area of the positive electrode layer is less than or equal to the negative electrode layer, which is less than the solid electrolyte layer, with a buffer layer having a lower Young's modulus than the other layers, and is pressurized through this buffer layer to achieve optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laminate structure with positive electrode layer, solid electrolyte layer, and negative electrode layer is used, then safety and reliability are improved, but it is difficult to maintain constant discharge capacity after repeated charging and discharging
Solution Approach 1:
The patent applies parameter changes by controlling the pressurized state of the laminate to a specific range (1.5 to 200 MPa). This pressure parameter optimization ensures proper contact between layers while preventing degradation, thereby maintaining cycle characteristics and safety simultaneously
Solution Approach 2:
The patent introduces support plates as intermediary components with through holes. These support plates are connected and tightened to apply and distribute pressure uniformly across the laminate structure, mediating between the need for compression (for contact) and the risk of excessive pressure (for degradation)
2Reliability
If a laminate structure with positive electrode layer, solid electrolyte layer, and negative electrode layer is used, then safety and reliability are improved, but discharge load characteristics and high-speed charging characteristics are difficult to achieve
Solution Approach 1:
The patent optimizes the pressure parameter within the range of 1.5 to 200 MPa to enhance ion conduction efficiency. This parameter control improves discharge load characteristics and high-speed charging characteristics while maintaining safety
Solution Approach 2:
The support plates act as intermediaries that distribute pressure uniformly across the electrode and electrolyte layers. This uniform pressure distribution ensures consistent contact and optimal ion transport pathways, improving productivity-related characteristics
3Duration of action of moving object
If pressure is applied to the laminate to maintain constant discharge capacity, then cycle characteristics are improved, but discharge load characteristics and high-speed charging characteristics are compromised
Solution Approach 1:
The patent identifies and controls the pressure parameter within an optimal range (1.5 to 200 MPa). This precise parameter control achieves the dual benefit of maintaining cycle characteristics through proper layer contact while preserving discharge load characteristics by avoiding excessive pressure that would impede ion transport
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 configuration results in excellent cycle characteristics, discharge load characteristics, and high-speed charging characteristics by ensuring uniform pressure distribution and preventing short-circuits, while maintaining battery performance even after repeated charging and discharging.
Implementation Method 1
a buffer layer having an area more than the area of the solid electrolyte layer and having a Young's modulus lower than that of each of, the positive electrode layer, the solid electrolyte layer, and the negative electrode layer is provided
Data Source
AI summary
Provided is an all-solid state secondary battery comprising a laminate in which a positive electrode layer, a solid electrolyte layer, and a negative electrode layer are laminated in this order,in which respective areas of the positive electrode layer, the solid electrolyte layer, and the negative electrode layer satisfy [the area of the positive electrode layer]<[the area of the negative electrode layer]≤[the area of the solid electrolyte layer],a buffer layer having an area more than the area of the solid electrolyte layer and having a Young's modulus lower than that of each of, the positive electrode layer, the solid electrolyte layer, and the negative electrode layer is provided on either or both of a side of the positive electrode layer opposite to the solid electrolyte layer side and a side of the negative electrode layer opposite to the solid electrolyte layer side, andthe laminate is in a pressurized state through the buffer layer.