All-Solid Battery Multilayer Electrodes for Higher Capacity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Small non-polar all solid batteries have limited capacity, necessitating an enhancement to increase their energy storage capabilities while maintaining reliability and safety during short-circuit tests.
Innovation Solution
A multilayer structure is implemented with varying thicknesses of electrode layers, where both positive and negative electrode active materials are used in each layer, and external electrodes are connected to specific faces, allowing for adjustable capacity based on material ratios and thickness differences, along with a marker system for polarity distinction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-polar all solid battery is designed with both positive and negative electrode active materials in each electrode layer, then reliability during short-circuit tests is improved, but capacity is limited and remains small
Solution Approach 1:
The battery is divided into multiple first electrode layers and multiple second electrode layers stacked in alternation with solid electrolyte layers. Each first electrode layer contains first positive electrode active material and first negative electrode active material, while each second electrode layer contains second positive electrode active material and second negative electrode active material. This segmentation allows independent optimization of each layer's thickness and material composition to increase overall capacity while maintaining the non-polar structure for reliability.
Solution Approach 2:
Different electrode layers are designed with different thicknesses - the first electrode layers have a first thickness and the second electrode layers have a second thickness that differs from the first. Additionally, different positive and negative electrode active materials are used in different layers, allowing each layer to be optimized locally for its specific function while contributing to the overall increased capacity of the battery.
2Quantity of substance
If electrode layer thicknesses are increased to increase capacity, then energy storage capability is improved, but the complexity of manufacturing with varying thicknesses increases
Solution Approach 1:
The battery structure is segmented into repeating units of first electrode layer-solid electrolyte layer-second electrode layer-solid electrolyte layer. This modular segmentation simplifies manufacturing by allowing standardized production of each layer type, even though the thicknesses vary between first and second electrode layers. Each segment can be manufactured independently and then assembled through stacking.
Solution Approach 2:
The patent utilizes the stacking dimension (vertical arrangement) to increase capacity rather than increasing the lateral area of single electrode layers. By creating a multilayer structure with alternating first and second electrode layers of different thicknesses, the battery achieves higher capacity through the third dimension, which simplifies the manufacturing process compared to creating extremely thick single layers.
Data Source
AI summary
An all solid battery includes a multilayer structure in which first electrode layers each having a positive electrode active material and a negative electrode active material, solid electrolyte layers, and second electrode layers each having a positive electrode active material and a negative electrode active material are stacked, a thickness of the first electrode layers being different from a thickness of the second electrode layers, the first electrode layers being extracted to a first face of the multilayer structure, the second electrode layers being extracted to a second face of the multilayer structure. A first external electrode is provided on the first face and is connected to the first electrode layers. A second external electrode is provided on the second face and is connected to the second electrode layers.