Solid Electrolyte Battery Protective Layer Impedance Reduction
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Solution Overview
Problem
The amorphous lithium phosphate compound used as a positive electrode active material in thin-film solid electrolyte batteries experiences increased impedance when directly contacting the positive electrode current collector, leading to poor charge-discharge characteristics during high-speed charging and discharging.
Innovation Solution
A solid electrolyte battery configuration is introduced, featuring a positive electrode side layer with a protective layer between the current collector and the active material layer, reducing the reaction between the two and thus minimizing impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the amorphous positive electrode active material directly contacts the positive electrode current collector, then the battery structure is simple, but the impedance increases causing poor charge-discharge characteristics
Solution Approach 1:
The patent introduces a positive electrode protective layer as an intermediary between the positive electrode current collector and the amorphous positive electrode active material. This protective layer prevents direct contact and reaction between the two materials, thereby reducing impedance and improving charge-discharge characteristics while maintaining a relatively simple battery structure.
2Ease of manufacture
If the amorphous positive electrode active material directly contacts the positive electrode current collector, then the manufacturing process is simple, but the impedance increases during high-speed charging and discharging
Solution Approach 1:
The positive electrode protective layer serves as a mediator that allows the manufacturing process to remain simple while enabling high-speed charging and discharging. The protective layer can be formed through conventional thin-film deposition techniques, and its presence prevents impedance increase during high-rate charge-discharge operations.
3Reliability
If a protective layer is placed between the current collector and active material, then the impedance is reduced and charge-discharge characteristics improve, but the battery structure becomes more complex
Solution Approach 1:
The patent employs a thin-film protective layer that adds minimal structural complexity while effectively reducing impedance. The thin-film nature of the protective layer allows it to be integrated into the existing battery structure without significantly increasing device complexity, while still providing the necessary impedance reduction for improved charge-discharge characteristics.
Data Source
AI summary
Provided is a solid electrolyte battery that has favorable charge-discharge characteristics with impedance reduced.This solid electrolyte battery has, on a substrate 10, a stacked body of a positive electrode side current collector film 30, a positive electrode protective film 31, a positive electrode active material film 40, a solid electrolyte film 50, a negative electrode potential formation layer 64, and a negative electrode side current collector film 70 stacked in this order. The positive electrode active material film 40 is composed of an amorphous positive electrode active material. The positive electrode protective film 31 is composed of LiCoO2, LiMn2O4, LiNiO2, or the like.