All-Solid-State Battery Pressure Control for Cycle Stability
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Solution Overview
Problem
All-solid-state batteries often exhibit insufficient cycle characteristics due to corrosion of metal current collectors and non-uniform electrochemical reactions, which degrade their performance.
Innovation Solution
A battery design featuring a solid electrolyte layer with specific compositions and an external pressure management system to maintain internal pressure below 101.3 kPa, preventing corrosion and ensuring uniform electrochemical reactions by minimizing space between electrodes and reducing halogenated gas accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrolyte materials are used in all-solid-state batteries, then the battery structure is simplified and energy density is increased, but corrosion of metal current collectors occurs leading to poor cycle characteristics
Solution Approach 1:
An aluminum oxide coating layer is introduced as an intermediary between the aluminum current collector and the solid electrolyte. This coating layer acts as a protective barrier that prevents direct contact and chemical reaction between the aluminum current collector and the solid electrolyte, thereby preventing corrosion while maintaining the benefits of all-solid-state battery structure
Solution Approach 2:
A thin aluminum oxide coating layer is applied on the aluminum current collector surface. This coating layer is relatively inexpensive to form (through anodization or other oxidation processes) and serves its protective function effectively throughout the battery's operational life, preventing corrosion without requiring complex or expensive materials
2Reliability
If solid electrolyte materials are used in all-solid-state batteries, then energy density is increased, but non-uniform electrochemical reactions occur degrading performance
Solution Approach 1:
The aluminum oxide coating layer provides locally uniform protection across the current collector surface, ensuring consistent electrochemical reaction conditions throughout the battery. This uniform coating prevents localized corrosion and ensures even distribution of electrochemical reactions, maintaining performance while preserving high energy density
3Reliability
If metal current collectors are used in batteries, then electrical conductivity is improved, but corrosion occurs when exposed to atmosphere
Solution Approach 1:
The aluminum oxide coating layer serves as an intermediary protective layer between the aluminum current collector and the external atmosphere. This coating prevents direct exposure of the metal to corrosive environmental factors while maintaining the electrical conductivity function of the current collector
Solution Approach 2:
The current collector structure becomes a composite material system consisting of aluminum metal core with an aluminum oxide surface layer. This composite structure combines the high electrical conductivity of aluminum metal with the corrosion resistance of aluminum oxide, achieving both requirements simultaneously
Data Source
AI summary
A battery (100) according to an embodiment includes a power storage element (10) which includes a positive electrode (11), a negative electrode (13), and a solid electrolyte layer (15) which is disposed between the positive electrode (11) and the negative electrode (13) and an exterior body (20) which covers the power storage element (10). At least one of the positive electrode (11), the negative electrode (13), and the solid electrolyte layer (15) contains a solid electrolyte represented by Li3+a-cE1-bGbDcXd-c ⋅⋅⋅ (1) and an internal pressure in an accommodation space (K) enclosed by the exterior body (20) is less than 101.3 kPa.