Solid-State Battery Laminate With Asymmetric Electrode Loading
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Solution Overview
Problem
Current collection-less solid-state batteries face challenges in maintaining the balance of charge-discharge reactions due to the absence of a current collecting layer, which affects ion conductivity and the overall efficiency of the battery.
Innovation Solution
The solid-state battery design includes a laminate structure with varying active material amounts between the outermost and non-outermost electrode layers, eliminating the need for a current collector, thereby improving the balance of charge and discharge reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a current collecting layer is eliminated to simplify the battery structure, then device complexity is reduced, but the balance of charge-discharge reaction deteriorates due to loss of ionic insulation
Solution Approach 1:
The patent applies local quality by creating asymmetric active material distribution where the outermost electrode layer has a different active material amount compared to inner electrode layers. This localized variation compensates for the absence of the current collecting layer by optimizing ionic insulation specifically where needed at the battery periphery, thereby maintaining charge-discharge balance without requiring the eliminated current collecting structure.
Solution Approach 2:
The patent changes the parameter of active material amount across different electrode layers. By varying the active material concentration in the outermost layer versus inner layers, the system achieves proper ionic insulation and charge-discharge balance without relying on the current collecting layer, thus resolving the contradiction between structural simplification and reaction balance.
2Quantity of substance
If the active material amount is increased to enhance energy density, then the energy storage capacity is improved, but the charge-discharge reaction balance deteriorates
Solution Approach 1:
The patent implements local quality by differentiating the active material amount in the outermost electrode layer from that in inner layers. This spatial variation allows the system to achieve high overall energy density while maintaining proper charge-discharge balance through optimized ionic insulation at the outermost region, preventing the deterioration that would result from uniform high active material distribution.
Solution Approach 2:
The patent segments the electrode structure into outermost and inner layers with different active material amounts. This segmentation allows independent optimization of each region: inner layers provide high energy density while the outermost layer provides ionic insulation, thereby achieving both high energy storage capacity and balanced charge-discharge reactions.
3Quantity of substance
If the outermost electrode layer has high active material amount to maximize energy storage, then energy density is improved, but stress on the battery increases
Solution Approach 1:
The patent applies local quality by reducing the active material amount in the outermost electrode layer compared to inner layers. This localized adjustment decreases stress concentration at the battery periphery while maintaining high overall energy storage capacity through the active material-rich inner layers, thereby resolving the contradiction between energy storage and stress reduction.
Solution Approach 2:
The patent segments the electrode into stress-prone outermost layers and inner layers, assigning different active material amounts to each. The outermost layers have reduced active material to minimize stress, while inner layers maintain high active material for energy storage, achieving both goals through functional segmentation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows for easier attainment of a prescribed voltage during discharge, enhances energy density, and reduces stress on the battery, leading to improved long-term reliability and efficiency.
Implementation Method 1
a solid-state battery using a solid electrolyte instead of an electrolytic solution has been studied
Implementation Method 2
In the charge-discharge reaction of the solid-state battery, lithium ions move back and forth between the positive electrode and the negative electrode via the solid electrolyte
Data Source
AI summary
A solid-state battery including a solid-state battery laminate having one or more positive electrode layers, one or more negative electrode layers, and a solid electrolyte interposed therebetween. Each of the electrode layers of the one or more positive electrode layers and the one or more negative electrode layers contains an active material, and an outermost electrode layer of the solid-state battery laminate has a different active material amount with respect to a non-outermost electrode layer located on an inner side of the outermost electrode layer.