Solid-State Battery Lamination for Dense Electrolyte Interfaces
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Solution Overview
Problem
Existing methods for manufacturing solid-state batteries face challenges in achieving sufficient densification and adhesion of the solid electrolyte layers, leading to issues like abnormal electrodeposition and suboptimal battery performance due to limitations in integration pressure and binder content.
Innovation Solution
A manufacturing method involving specific pressure regimes for laminating layers, including a higher pressure for certain solid electrolyte layers, ensures densification and adhesion, reducing abnormal electrodeposition by using a structured lamination process with distinct solid electrolyte layers and an intermediate layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high pressure is applied to integrate the solid electrolyte layer between electrode layers, then adhesion between layers is improved, but each layer may be damaged
Solution Approach 1:
The solid electrolyte layer is divided into a first solid electrolyte layer adjacent to the negative electrode and a second solid electrolyte layer between the first solid electrolyte layer and the positive electrode. This segmentation allows each layer to be optimized for its specific function and pressed at appropriate pressures without damaging the entire structure.
Solution Approach 2:
The first solid electrolyte layer is designed with a smaller Young's modulus than the second solid electrolyte layer. This local quality difference allows the first layer to be more compliant and better at adhering to the negative electrode under pressing, while the second layer maintains higher mechanical strength to prevent damage.
2Strength
If the Young's modulus of the first solid electrolyte layer is decreased to improve adhesion, then close adhesion to the negative electrode is achieved, but binder content must be increased which reduces battery performance
Solution Approach 1:
The Young's modulus of the first solid electrolyte layer is changed to be smaller than that of the second solid electrolyte layer. This parameter change improves adhesion to the negative electrode without requiring increased binder content, thus maintaining battery performance.
Solution Approach 2:
The solid electrolyte layer is constructed as a composite structure with two different solid electrolyte layers having different Young's moduli. This composite structure achieves both good adhesion and high performance without relying on excessive binder content.
3Ease of manufacture
If the solid electrolyte layer is not sufficiently densified at the interface with the negative electrode, then manufacturing is easier, but abnormal electrodeposition occurs and battery performance deteriorates
Solution Approach 1:
The first solid electrolyte layer adjacent to the negative electrode is designed with different properties (smaller Young's modulus) than the second solid electrolyte layer. This local quality optimization ensures sufficient densification at the critical interface with the negative electrode to prevent abnormal electrodeposition, while the rest of the structure maintains manufacturability.
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 method enhances battery performance by ensuring densified electrolyte layers, improving adhesion and reducing defects, thereby achieving improved charge-discharge efficiency and stability.
Implementation Method 1
a positive electrode layer and a negative electrode layer are separately pressed and a solid electrolyte layer is then pressed with sandwiched between the positive electrode layer and the negative electrode layer such that these layers are integrated
Data Source
AI summary
Provided is a method for manufacturing a solid-state battery having preferable battery performance with less occurrence of abnormal electrocrystallization. The method is a method for manufacturing a solid-state battery having an electrode laminate configured such that a negative electrode layer, an intermediate layer, a solid electrolyte layer, and a positive electrode layer are laminated in this order. The solid electrolyte layer includes a first solid electrolyte layer disposed on the negative electrode layer side, a second solid electrolyte layer disposed adjacent to the first solid electrolyte layer, and a third solid electrolyte layer disposed on the positive electrode layer side. The method includes Step 1, Step 2A, Step 3, and Step 4A.