Solid Electrolyte-Coated Battery Electrodes for Durability-Density Balance
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Solution Overview
Problem
Conventional techniques face a trade-off between achieving durability and energy density in batteries, making it difficult to optimize both simultaneously.
Innovation Solution
A battery configuration with a positive electrode coated by a fluorine-containing solid electrolyte material including Li, M1, and F, where M1 is Ti, Al, or Zr, and a capacity ratio between the negative and positive electrodes ranging from 0.78 to 1.31, which enhances durability and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional battery designs are used, then manufacturing simplicity is maintained, but durability and energy density cannot be optimized simultaneously
Solution Approach 1:
The positive electrode is segmented into multiple components: positive electrode active material particles, first solid electrolyte material coating the particles, and second solid electrolyte material filling spaces between particles. This segmentation allows each component to perform its specific function optimally, resolving the contradiction between durability and structural complexity.
Solution Approach 2:
The patent uses composite material structures where the positive electrode combines positive electrode active material with first and second solid electrolyte materials. The first solid electrolyte material (including Li, M1, and F) provides durability enhancement, while the second solid electrolyte material ensures ionic conductivity, achieving both reliability and functional performance through material composition.
2Reliability
If the capacity ratio is optimized for energy density, then energy density improves, but durability may be compromised
Solution Approach 1:
The patent specifies a capacity ratio parameter range of 0.78≤a≤1.31 to balance durability and energy density. Additionally, the first solid electrolyte material contains fluorine with specific atomic ratios (0.01≤x≤0.50 in Li1-xM12F6), and the second solid electrolyte material has controlled content (0.1-50 wt% relative to positive electrode active material). These parameter optimizations allow simultaneous improvement of durability and energy density without compromise.
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 effectively balances durability and energy density by optimizing the capacity ratio and ionic conductivity, leading to improved battery performance and safety.
Implementation Method 1
a ratio a of a capacity of the negative electrode to a capacity of the positive electrode satisfies 0.78≤a≤1.31
Data Source
AI summary
A battery according to one aspect of the present disclosure includes: a positive electrode; a negative electrode; and an electrolyte layer disposed between the positive electrode and the negative electrode, wherein the positive electrode includes a positive electrode active material and a first solid electrolyte material coating at least a portion of a surface of the positive electrode active material, the first solid electrolyte material includes Li, M1, and F, where M1 is at least one selected from the group consisting of Ti, Al, and Zr, and a ratio a of a capacity of the negative electrode to a capacity of the positive electrode satisfies 0.78≤a≤1.31.