Fluorinated Chloride Solid Electrolyte for Reduction Resistance
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Solution Overview
Problem
Existing solid electrolytes, such as Li3YCl6, exhibit high ionic conductivity but lack stability, particularly in humid environments, and require improved resistance to reduction to enhance energy density in all-solid-state batteries.
Innovation Solution
A solid electrolyte composition containing Li, Mα, Mβ, Mγ, Cl, and F, where Mα is Zr or Hf, Mβ is Ta or Nb, and Mγ is Gd, Yb, Dy, Er, or Sc, with a specific ionic radius and electronegativity balance, and the addition of F improves resistance to reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chloride electrolytes such as Li3YCl6 are used to achieve high ionic conductivity at ambient temperature, then ionic conductivity is improved, but stability against humidity deteriorates
Solution Approach 1:
The patent employs composite material strategy by combining multiple cations (Mα from Zr/Hf, Mβ from Ta/Nb, Mγ from rare earth elements) with Li and Cl to form a composite electrolyte system. This composite approach allows the material to achieve both high ionic conductivity and improved stability against humidity, as the synergistic effect of different cations compensates for the weaknesses of individual components.
Solution Approach 2:
The patent systematically varies compositional parameters including the types and ratios of cations (Mα, Mβ, Mγ), the Li content, and the Cl:F ratio to optimize both ionic conductivity and stability. By adjusting these parameters within specific ranges, the electrolyte achieves the desired balance between conductivity and environmental stability.
2Reliability
If solid electrolytes are designed to improve energy density, then resistance to reduction must be improved, but this may compromise other performance parameters
Solution Approach 1:
The electrolyte uses a composite cation system where Mα (Zr/Hf), Mβ (Ta/Nb), and Mγ (rare earth elements) work synergistically to provide high resistance to reduction while maintaining other essential performance characteristics. The specific combination and ratios of these cations create a balanced material that satisfies multiple performance requirements simultaneously.
Solution Approach 2:
The patent assigns specific functional roles to different cation components: Mα provides structural framework, Mβ enhances reduction resistance, and Mγ optimizes ionic conductivity and stability. This functional differentiation within the composite material allows each component to contribute to specific performance aspects, achieving overall performance balance.
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 electrolyte achieves high ionic conductivity and stability, enhancing the safety and energy density of all-solid-state batteries by suppressing reduction decomposition reactions.
Implementation Method 1
Li 3 YCl 6 exhibits high Li ionic conductivity at ambient temperature
Implementation Method 2
solid electrolytes are required to have improved resistance to reduction in order to improve energy density
Data Source
Figure 1
AI summary
A solid electrolyte contains Li, Mα, Mβ, Mγ, Cl, and F. Mα is at least one element selected from the group consisting of Zr and Hf, Mβ is at least one element selected from the group consisting of Ta and Nb, and Mγ is at least one element selected from the group consisting of Gd, Yb, Dy, Er, Ho, Eu, and Sc. This provides the solid electrolyte with excellent resistance to reduction.