Solid-State Battery Electrode Thickness Layout for Crack Prevention
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Solution Overview
Problem
Conventional solid-state batteries experience issues with non-uniform volume change during charge and discharge, leading to cracking and peeling of electrode layers due to differences in active material distribution and volume change between terminal and non-terminal contact end portions.
Innovation Solution
The battery design includes terminal contact end portions with electrode active material in direct contact with external terminals, and non-terminal contact end portions with reduced thickness compared to the central portion, ensuring uniform charge-discharge reactions and minimizing volume change differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode layers have uniform thickness throughout, then the manufacturing process is simpler, but non-uniform volume change during charge and discharge causes cracking and peeling at the end portions
Solution Approach 1:
The electrode layers are designed with different thicknesses in different regions: the central portion maintains a first thickness while the end portions have a second thickness smaller than the first. This local variation in thickness compensates for the non-uniform volume change during charge and discharge, preventing cracking and peeling at the end portions while maintaining manufacturing feasibility.
2Quantity of substance
If the active material amount is increased in the terminal contact end portions, then the battery capacity is improved, but the volume change difference between terminal and non-terminal portions increases causing cracking
Solution Approach 1:
The invention optimizes the active material distribution by adjusting the thickness of electrode layers at different positions. The end portions have reduced thickness compared to the central portion, which balances the active material amount across different regions. This local optimization ensures that the volume change during charge and discharge is more uniform throughout the electrode layers, preventing cracking while maintaining sufficient battery capacity.
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 configuration reduces cracking and peeling of electrode layers, enhances battery performance, and improves long-term reliability by ensuring uniform volume change and increased battery capacity.
Implementation Method 1
Charge-discharge reaction of the solid-state battery may be caused by conduction of ions between the positive electrode active material and the negative electrode active material via the solid electrolyte.
Data Source
AI summary
A solid-state battery including a solid-state battery laminated body including a positive electrode layer, a negative electrode layer, and a solid electrolyte interposed between the positive electrode layer and the negative electrode layer; a positive electrode terminal on a first side surface of the solid-state battery laminated body; and a negative electrode terminal on a second side surface of the solid-state battery laminated body, the second side surface facing the first side surface. In such a solid-state battery, in at least one electrode layer of the positive electrode layer and the negative electrode layer, a terminal contact end portion containing an electrode active material is in direct contact with the respective positive or negative electrode terminal, and a thickness of a non-terminal contact end portion in the electrode layer is smaller than a thickness of a central portion of the electrode layer.