All solid battery
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Solution Overview
Problem
All solid batteries face degradation in long-term cycle stability due to expansion and contraction of electrode active materials, leading to reduced contact points between internal electrodes and solid electrolyte layers, which affects normal battery operation and reliability.
Innovation Solution
The battery design incorporates a multilayer chip structure with specific thickness ranges for solid electrolyte and internal electrodes, ensuring adequate contact points and preventing shorts, where the solid electrolyte layer is between 1 μm and 50 μm thick, and internal electrodes are between 1 μm and 200 μm thick, with optimized non-overlap portions to maintain battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the solid electrolyte layer is made thinner to improve battery responsiveness, then the responsiveness is improved, but the risk of shorts between internal electrodes increases
Solution Approach 1:
The patent optimizes the thickness parameter of the solid electrolyte layer to a specific range (1-50 μm) to balance responsiveness and short prevention. This parameter change allows the battery to achieve fast ion transport (improved responsiveness) while maintaining sufficient physical separation between electrodes (preventing shorts).
Solution Approach 2:
The patent applies different thickness specifications to different regions: the solid electrolyte layer thickness SE is controlled at 1-50 μm in overlap portions to prevent shorts, while the non-overlap portion length EM is optimized at 50-800 μm for ion transport efficiency. This local differentiation resolves the contradiction between responsiveness and short prevention.
2Quantity of substance
If the internal electrode thickness is increased to improve capacity, then the capacity is improved, but the battery responsiveness deteriorates
Solution Approach 1:
The patent optimizes the internal electrode thickness parameter EL to a specific range (1-200 μm) to balance capacity and responsiveness. This parameter optimization ensures sufficient active material for high capacity while maintaining thin enough structure for fast ion and electron transport, preventing responsiveness deterioration.
Solution Approach 2:
The patent differentiates thickness requirements between overlap and non-overlap portions. In overlap portions, the electrode thickness EL (1-200 μm) provides sufficient capacity, while the solid electrolyte thickness SE (1-50 μm) maintains responsiveness. This local quality differentiation resolves the capacity-speed contradiction.
3Reliability
If the non-overlap portion length EM is increased to prevent shorts, then the safety is improved, but the battery responsiveness deteriorates
Solution Approach 1:
The patent optimizes the non-overlap portion length EM to a specific range (50-800 μm) that simultaneously achieves short prevention and maintains responsiveness. This parameter optimization ensures sufficient separation distance for safety while keeping the ion transport path short enough for fast response.
Solution Approach 2:
The patent applies differentiated dimensional specifications: the non-overlap portion length EM (50-800 μm) provides safety margin for short prevention, while the overlap portion solid electrolyte thickness SE (1-50 μm) ensures fast ion transport. This local differentiation resolves the safety-speed contradiction.
4Duration of action of moving object
If electrode active materials expand and contract during cycling, then the battery operates normally, but contact points between internal electrodes and solid electrolyte layers are reduced
Solution Approach 1:
The patent designs the solid electrolyte layer with sufficient thickness (1-50 μm) beforehand to accommodate the expansion and contraction of electrode materials during cycling. This pre-designed thickness buffer ensures that even when electrodes expand or contract, the solid electrolyte maintains continuous contact and prevents loss of contact points, thereby improving long-term cycle stability.
Solution Approach 2:
The patent optimizes the solid electrolyte layer thickness parameter SE to a specific range (1-50 μm) that provides sufficient cushioning space for electrode volume changes during cycling. This parameter change allows the solid electrolyte to absorb expansion/contraction stresses while maintaining adequate contact points, resolving the cycle stability-contact maintenance contradiction.
Data Source
AI summary
An all solid battery includes a multilayer chip in which plurality of internal electrodes are alternately exposed to two side faces. A thickness SE of a solid electrolyte layer is 1 μm or more and 50 μm or less in an intersection portion in which two internal electrodes next to each other connected to different external electrodes overlap with each other. Thicknesses EL1 and EL2 of the two internal electrodes are 1 μm or more and 200 μm or less. In one of two non-intersection portions, a length EM from one of the pair of external electrodes contacting the one of the two non-intersection portions to an internal electrode spaced from the one of the pair of external electrodes in a distance direction is 50 μm or more and 800 μm or less. EM/(SE+EL1/4+EL2/4) is 20 or less.