Solid Electrolyte Laminated Sheet for Oxidation and Reduction Resistance
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Solution Overview
Problem
Conventional lithium ion solid state batteries face challenges in achieving both oxidation resistance and reduction resistance in their solid electrolyte layers, which are crucial for continuous battery operation and high energy density, as existing self-supporting solid electrolyte sheets do not adequately meet these requirements.
Innovation Solution
A solid electrolyte laminated sheet is developed by stacking multiple self-supporting sheets, where one outermost layer is filled with a solid electrolyte resistant to oxidation and the other with a solid electrolyte resistant to reduction, using porous heat-resistant fibers like aramid, Al2O3, or glass fibers, with a porosity of 60-95% and thickness of 5-30 μm, to enhance both oxidation and reduction resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single self-supporting solid electrolyte sheet is used, then the battery structure is simple and handling is easy, but the sheet cannot provide both oxidation resistance and reduction resistance simultaneously
Solution Approach 1:
The solid electrolyte sheet is segmented into multiple layers, each with distinct functional characteristics. The first solid electrolyte layer provides oxidation resistance while the second solid electrolyte layer provides reduction resistance, allowing each layer to specialize in one protective function rather than requiring a single layer to perform both functions simultaneously
Solution Approach 2:
The invention uses a composite structure comprising multiple solid electrolyte layers with different chemical resistance properties. By combining materials that excel at oxidation resistance with materials that excel at reduction resistance, the composite sheet achieves comprehensive chemical stability that neither material could provide alone
2Quantity of substance
If the solid electrolyte layer is made thin to improve energy density, then energy density increases, but the self-supporting property deteriorates
Solution Approach 1:
The thin solid electrolyte sheet is divided into multiple ultra-thin layers, each contributing to the overall mechanical strength through their collective structure. This segmentation allows the total thickness to remain small for high energy density while the multi-layer architecture provides enhanced mechanical integrity compared to a single layer of equivalent total thickness
Solution Approach 2:
The invention employs ultra-thin solid electrolyte films with controlled porosity and structural characteristics that enable self-supporting properties at minimal thickness. The thin film structure is designed to maintain mechanical stability through appropriate pore size, wall thickness, and overall architecture, allowing the sheet to support itself without additional backing while remaining thin enough for high energy density
Data Source
AI summary
Provided is a solid electrolyte laminated sheet having a self-supporting property and capable of realizing a solid state battery having high output characteristics. A plurality of supports are used, a solid electrolyte is filled in each support to form a self-supporting sheet, and the self-supporting sheets are superimposed to form a solid electrolyte laminated sheet. Specifically, the solid electrolyte laminated sheet is configured by setting a layer of the solid electrolyte laminated sheet in contact with a positive electrode layer being the outermost layer as a self-supporting sheet in which a solid electrolyte resistant to oxidation is filled, and a layer in contact with a negative electrode layer being the opposite outermost layer as a self-supporting sheet in which a solid electrolyte resistant to reduction is filled.