All-Solid Battery Electrode Composition for Reverse-Polarity Testing
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Solution Overview
Problem
The degradation of battery properties and reduced yielding percentage caused by short-circuit tests, especially in downsized all solid batteries, due to incorrect polarity during testing, which leads to unexpected carrier movement and capacity density loss.
Innovation Solution
An all solid battery design with a solid electrolyte layer and electrode layers containing both positive and negative electrode active materials, where the ratio of these materials in the positive and negative electrode layers is optimized to maintain capacity density and prevent property degradation, even under incorrect polarity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-polar battery design is used where both electrode layers include both positive and negative electrode active materials, then the battery can be mounted regardless of polarity and short-circuit test reliability is improved, but the capacity density decreases because the ratio of positive electrode active material equals the ratio of negative electrode active material
Solution Approach 1:
The patent applies local quality by creating asymmetric composition ratios in different electrode layers. The positive electrode layer has a higher ratio of positive electrode active material (SCathode) while the negative electrode layer has a higher ratio of negative electrode active material (SAnode), with SCathode > SAnode. This local differentiation allows each layer to contribute differently to the overall battery function, maintaining non-polar mounting capability while optimizing capacity density through differentiated material distribution.
Solution Approach 2:
The patent implements asymmetry by deliberately designing the positive electrode layer and negative electrode layer with different active material composition ratios. Instead of symmetric equal ratios, the design establishes SCathode > SAnode, creating an asymmetric structure that breaks the limitation of conventional non-polar batteries. This asymmetric design enables the battery to maintain polarity-insensitive mounting capability while achieving superior capacity density through optimized asymmetric material distribution.
2Quantity of substance
If the ratio of positive electrode active material in the positive electrode layer is increased beyond the ratio in the negative electrode layer, then capacity density is improved, but the non-polar mounting capability may be compromised
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition ratios of active materials in each electrode layer. It establishes specific parameter relationships where SCathode (ratio of positive electrode active material in positive electrode layer) is greater than SAnode (ratio of negative electrode active material in negative electrode layer). This parameter optimization allows the battery to achieve enhanced capacity density while maintaining the non-polar mounting capability through controlled asymmetric ratio design.
Data Source
AI summary
An all solid battery includes a solid electrolyte layer, a positive electrode layer that includes a positive electrode active material and a negative electrode active material, and a negative electrode layer that includes a positive electrode active material and a negative electrode active material, wherein a relationship “SCathode>SAnode” is satisfied, when a ratio of the positive electrode active material of the positive electrode layer is a ratio A1, a ratio of the negative electrode active material of the positive electrode layer is a ratio B1, a ratio of the positive electrode active material of the negative electrode layer is a ratio A2, a ratio of the negative electrode active material of the negative electrode layer is a ratio B2, SCathode is A1/(A1+B1), and SAnode is A2/(A2+B2).