Solid Electrolyte Design for Stable Li-Ion Batteries
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Summary
Problems
Nonaqueous electrolyte batteries with sulfide-based solid electrolytes face issues with yield due to uneven Li-ion distribution and electrochemical instability, leading to reduced discharge capacity and cycle life.
Innovation solutions
A nonaqueous electrolyte battery design with a solid electrolyte layer containing Li, P, and O, where the O content is reduced stepwise from the positive electrode to the negative electrode side, ensuring a portion near the interface has an O content of 3 atomic percent or more, promoting uniform Li-ion distribution and stability.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If oxygen content in the solid electrolyte layer is increased, then electrochemical stability to metallic Li is improved, but Li-ion conductivity is reduced
Why choose this principle:
The solid electrolyte layer is designed with non-uniform oxygen content distribution, where the oxygen content varies from the positive electrode layer side to the negative electrode layer side. This local variation allows different regions to have optimized properties: higher oxygen content near the negative electrode for stability, and lower oxygen content near the positive electrode for conductivity, thereby resolving the contradiction between electrochemical stability and Li-ion conductivity.
Principle concept:
If Li-ion conductivity is nonuniform in the solid electrolyte layer, then Li ions are concentrated at high conductivity portions, but this causes uneven metallic Li distribution and reduced electrode area utilization
Why choose this principle:
By carefully controlling the oxygen content gradient and maintaining overall uniformity in Li-ion conductivity across the solid electrolyte layer, the patent prevents excessive Li-ion concentration at specific regions. The oxygen content is optimized to balance conductivity uniformity with electrochemical stability, ensuring that Li ions are distributed evenly during charging and discharging, which prevents uneven metallic Li deposition and maintains high electrode area utilization throughout charge-discharge cycles.
Application Domain
Data Source
AI summary:
A nonaqueous electrolyte battery design with a solid electrolyte layer containing Li, P, and O, where the O content is reduced stepwise from the positive electrode to the negative electrode side, ensuring a portion near the interface has an O content of 3 atomic percent or more, promoting uniform Li-ion distribution and stability.
Abstract
There are provided an electric power generating element which has excellent cycle characteristics and which can be produced in satisfactory yield, and a nonaqueous electrolyte battery including the electric power generating element. In an electric power generating element including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer arranged between these electrode layers, the solid electrolyte layer containing Li, P, S, and O, the O content of the solid electrolyte layer is set so as to be reduced stepwise or continuously from the positive electrode layer side to the negative electrode layer side. When the electric power generating elements each having the structure are produced, most of them provide stable cycle characteristics, i.e., the electric power generating elements are produced in satisfactory yield