Oxide-Chloride Solid Electrolyte for Humidity-Stable Li-Ion Conduction
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Solution Overview
Problem
Existing solid electrolytes, such as Li3YCl6, exhibit high ionic conductivity but lack stability under humid conditions, leading to decomposition and loss of conductivity.
Innovation Solution
A solid electrolyte composition containing Li, Zr, Ta, Gd, Cl, and O, with specific molar ratios, is developed to enhance both ionic conductivity and stability, achieved through mechanochemical milling and incorporating oxygen to create structural defects that improve Li ion pathways.
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 under humid conditions deteriorates
Solution Approach 1:
The patent uses a composite material system with multiple cations (Li, Mα, Mβ, Mγ) and anions (Cl, O) to create a solid electrolyte that combines high ionic conductivity with enhanced stability. The specific composition Li6-(4+a-b)(1+c)Mα(1-a-b)(1+c)Mβa(1+c)Mγb(1+c)Cl6-2dOd integrates elements from different groups to achieve both performance and stability simultaneously
Solution Approach 2:
The patent systematically varies the compositional parameters (a, b, c, d) to optimize the balance between ionic conductivity and stability. By controlling the ratios of different cations and the oxygen content, the patent achieves a composition that maintains high conductivity while resisting decomposition under humid conditions
2Stability of the object's composition
If various cations are combined in LixMCl6 to improve stability, then stability is improved, but sufficient ionic conductivity and stability cannot be constantly achieved
Solution Approach 1:
The patent employs systematic parameter optimization by varying the compositional ratios (a, b, c, d) to achieve the optimal balance between stability and ionic conductivity. The specific ranges and relationships between parameters are carefully controlled to ensure both properties are simultaneously satisfied
Solution Approach 2:
The patent uses a multi-cation composite system (Mα from Zr/Hf, Mβ from Ta/Nb, Mγ from rare earth elements) that leverages the complementary properties of different elements to achieve both high stability and sustained ionic conductivity that single-cation systems cannot provide
3Reliability
If heat treatment is applied to maintain performance, then ionic conductivity is improved, but production cost increases
Solution Approach 1:
The patent incorporates oxygen into the crystal structure during the initial synthesis process through mechanochemical milling, creating structural defects that facilitate Li ion pathways. This preliminary action eliminates the need for subsequent heat treatment to achieve high ionic conductivity, thereby reducing production costs while maintaining performance
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 new electrolyte maintains high ionic conductivity and stability without the need for heat treatment, ensuring consistent performance in dry room environments and reducing production costs.
Implementation Method 1
Li3YCl6 exhibits high Li ionic conductivity at ambient temperature
Implementation Method 2
achieved through mechanochemical milling and incorporating oxygen to create structural defects that improve Li ion pathways
Data Source
AI summary
A solid electrolyte contains Li, Mα, Mβ, Mγ, Cl, and O. 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.