All-solid-state battery electrode voids for stress absorption
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Solution Overview
Problem
All-solid-state batteries face issues with cracks and interfacial peeling due to internal stress, leading to increased internal resistance and deterioration of cycle characteristics, and existing solutions complicate the structure and manufacturing process.
Innovation Solution
Incorporating a plurality of voids and carbon materials in the negative or positive electrode layers, with at least 8% of the voids in contact with carbon materials, to absorb internal stress and reduce the occurrence of cracks and peeling at the laminated interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three solid electrolyte layers with different porosities are arranged between positive and negative electrode layers, then cracks are suppressed, but device complexity increases and manufacturing becomes difficult
Solution Approach 1:
The invention extracts the stress-absorbing function from the solid electrolyte layers and relocates it to the electrode layers by forming voids within them. This eliminates the need for multiple solid electrolyte layers with different porosities, simplifying the overall structure while maintaining crack suppression capability.
Solution Approach 2:
The voids in the electrode layers act as intermediary stress-absorbing elements that mediate between the expanding/contracting active materials and the rigid current collectors. These voids absorb internal stress generated during charge-discharge cycles, preventing crack formation without requiring complex multi-layer solid electrolyte structures.
2Reliability
If three solid electrolyte layers with different porosities are arranged between positive and negative electrode layers, then cracks are suppressed, but the thickness of the entire battery increases
Solution Approach 1:
The stress-absorbing function is extracted from separate solid electrolyte layers and integrated into the electrode layers themselves through void formation. This consolidation eliminates the need for additional thickness from multiple solid electrolyte layers while maintaining the same protective function.
Solution Approach 2:
The invention merges the stress-absorbing function with the electrode layers by incorporating voids directly into their structure. This integration allows the electrode layers to perform both their electrochemical function and stress management function simultaneously, reducing overall battery thickness.
3Reliability
If voids and carbon materials are arranged in electrode layers to absorb internal stress, then cracks and peeling are suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The invention specifies quantitative parameters for void arrangement (8% or more of voids in contact with carbon materials) to optimize stress absorption while maintaining manufacturing feasibility. These parameter specifications provide clear manufacturing targets without requiring excessive precision, balancing performance and 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 solution effectively suppresses cracks and peeling at the laminated interface, improving the cycle characteristics of the all-solid-state battery by absorbing stress and maintaining structural integrity.
Implementation Method 1
arranging a plurality of voids and a plurality of carbon materials in the negative electrode layer or the positive electrode layer, which is the source origin of internal stress, the internal stress generated in the all-solid-state battery can be reduced and the occurrence of cracks or interfacial peeling can be absorbed
Data Source
AI summary
An all-solid-state battery includes a positive electrode layer, a negative electrode layer, and a solid electrolyte layer positioned between the positive electrode layer and the negative electrode layer, the positive electrode layer includes a positive electrode current collector and a positive electrode active material layer which is in contact with the positive electrode current collector, the negative electrode layer includes a negative electrode current collector and a negative electrode active material layer which is in contact with the negative electrode current collector, at least one of the positive electrode active material layer and the negative electrode active material layer has a plurality of voids and a plurality of carbon materials therein, and 8% or more of the plurality of voids are in contact with any of the plurality of carbon materials.