Fluorinated Solid Electrolyte Composition for Oxidation-Resistant Batteries
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Solution Overview
Problem
Halide solid electrolytes with elements like Cl, Br, or I as anions tend to undergo oxidative decomposition during charge, leading to increased internal resistance in batteries due to oxidation reactions, which impede lithium-ion conductivity.
Innovation Solution
A novel halide solid electrolyte material comprising Li, Nb, Ti, and F, with M selected from Be, Mg, Ca, Sr, Ba, Sc, Y, Al, Ga, In, or Sn, which enhances oxidation resistance and ionic conductivity by incorporating F, which forms strong bonds with cations, reducing side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halide solid electrolytes with Cl, Br, or I as anions are used, then ionic conductivity can be achieved, but oxidative decomposition occurs during charge leading to increased internal resistance
Solution Approach 1:
The patent changes the chemical parameter by substituting the anion type from Cl/Br/I to F, and modifies the cation composition by incorporating specific ratios of Li, Nb, Ti, and M elements. This parameter change transforms the material's oxidation resistance properties while maintaining ionic conductivity, directly resolving the contradiction between achieving ionic conductivity and preventing oxidation-induced resistance increase
Solution Approach 2:
The patent creates a composite solid electrolyte material combining multiple cations (Li, Nb, Ti, M) with fluorine anion. This composite approach synergistically enhances oxidation resistance through the specific combination of elements, particularly leveraging F's high electronegativity and strong bonding capability, while maintaining the necessary ionic conductivity for battery operation
2Reliability
If F is incorporated to enhance oxidation resistance, then oxidative decomposition is suppressed, but material composition complexity increases
Solution Approach 1:
The patent defines specific compositional parameters with optimized ranges: Li content at 1.5-3.0, Nb at 0.1-0.5, Ti at 0.1-0.5, and M at 0.1-0.5, with F content adjusted accordingly. These parameter specifications balance oxidation resistance enhancement with compositional simplicity, providing a practical material design guideline that avoids excessive complexity while achieving the desired 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 material achieves high oxidation resistance and ionic conductivity, suppressing the increase in internal resistance during charge, thereby improving the performance of batteries.
Implementation Method 1
incorporating F, which forms strong bonds with cations, reducing side reactions
Data Source
AI summary
A solid electrolyte material according to the present disclosure includes Li, Nb, Ti, M, and F. The M is at least one selected from the group consisting of Be, Mg, Ca, Sr, Ba, Sc, Y, Al, Ga, In, Zr, and Sn. A battery according to the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer positioned between the positive electrode and the negative electrode. At least one selected from the group consisting of the positive electrode, the negative electrode, and the electrolyte layer includes the solid electrolyte material according to the present disclosure.