Solid-State Battery Terminal Layout for Uniform Ion Reaction
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Solution Overview
Problem
The charge-discharge reaction in solid-state batteries is non-uniform due to ion diffusion and precipitation in non-opposing regions between electrode layers, leading to ion loss and reduced efficiency.
Innovation Solution
A solid-state battery design with terminal contact portions having a relatively small active material amount, ensuring direct contact with terminals and reducing ion diffusion into non-opposing regions, thereby enhancing reaction uniformity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode layers are stacked with solid electrolyte layer therebetween, then ion conduction between electrodes is enabled, but ion diffusion into non-opposing regions occurs causing charge-discharge non-uniformity
Solution Approach 1:
The patent applies local quality by creating a terminal contact portion with different properties from the main electrode layer. Specifically, the terminal contact portion has a reduced active material amount or is filled with inactive material, creating a localized region with different ion conduction characteristics. This prevents ion diffusion into non-opposing regions at the terminal area while maintaining normal charge-discharge reaction uniformity in the main electrode regions.
2Ease of operation
If electrode layers extend to opposing side surfaces, then terminal contact is achieved, but non-opposing regions cause reduction product precipitation and ion loss
Solution Approach 1:
The patent applies the taking out principle by extracting or removing the active material from the terminal contact portion of the electrode layers. By creating a region with reduced or zero active material at the terminal contact area, the harmful ion diffusion and reduction product precipitation are eliminated at this location, while the main electrode regions retain their full active material content for normal operation.
3Reliability
If solid electrolyte layer is placed between electrode layers, then electrolyte leakage is prevented, but ion diffusion in non-opposing regions reduces charge-discharge efficiency
Solution Approach 1:
The patent applies local quality by creating a terminal contact portion with different composition or structure from the main electrode layer. This localized modification prevents ion diffusion into non-opposing regions at the terminal area, thereby eliminating reduction product precipitation and ion loss, while maintaining high charge-discharge efficiency in the main electrode regions.
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
The design improves charge-discharge efficiency and increases energy density by minimizing ion loss and precipitation, providing a more reliable solid-state battery with improved long-term performance.
Implementation Method 1
The charge-discharge reaction of the solid-state battery can be caused by conduction of ions between the positive electrode and the negative electrode via the solid electrolyte
Implementation Method 2
there is a possibility that the ions 100 are diffused into a negative electrode layer region between the negative electrode layer 10B and the positive electrode terminal 40A
Data Source
AI summary
A solid-state battery including a solid-state battery laminate having a battery constituent unit including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer along a stacking direction; a positive electrode terminal on a first side surface of the solid-state battery laminate; and a negative electrode terminal on a second side surface of the solid-state battery laminate. The positive electrode layer and the negative electrode layer include a terminal contact portion in direct contact with the positive electrode terminal and the negative electrode terminal, respectively, and a non-terminal contact portion other than the terminal contact portion, and at least one of the positive electrode layer and the negative electrode layer has relatively small active material amount with respect to the non-terminal contact portion.