Li-Nb-F Solid Electrolyte Composition Against Charge Oxidation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Halide solid electrolytes containing 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 negatively impact charge and discharge characteristics.
Innovation Solution
A solid electrolyte material comprising Li, Nb, 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, thereby suppressing the formation of resistance layers and maintaining battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halide solid electrolytes containing Cl, Br, or I as anions are used, then ionic conductivity is improved, but oxidative decomposition occurs during charge leading to increased internal resistance
Solution Approach 1:
The patent changes the chemical composition parameters by substituting Cl/Br/I anions with F anions, and substituting Li cations with a combination of Li, Na, and K cations. This parameter change transforms the electrolyte from prone to oxidation (Cl/Br/I) to oxidation-resistant (F), while the mixed alkali metal composition maintains ionic conductivity through multiple conduction pathways
Solution Approach 2:
The patent creates a composite solid electrolyte material combining multiple elements (Li, Na, K, and F) to achieve properties that individual components cannot provide alone. The composite structure enables simultaneous oxidation resistance from F and maintained ionic conductivity from the mixed alkali metal system
2Productivity
If halide solid electrolytes are used, then charge and discharge characteristics are improved, but resistance layers form during charge increasing internal resistance
Solution Approach 1:
The patent applies preliminary anti-action by using F-based solid electrolyte with mixed alkali metals that inherently prevents oxidation reactions before they can occur. The F-based composition and mixed cation system create chemical stability that preemptively blocks the formation of oxidative resistance layers, maintaining low internal resistance throughout charging cycles
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 proposed solid electrolyte material achieves high oxidation resistance and ionic conductivity, ensuring excellent charge and discharge characteristics and preventing the increase in internal resistance during charging.
Implementation Method 1
a solid electrolyte material includes: Li, Nb, M, and F, wherein 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
Data Source
AI summary
A solid electrolyte material of the present disclosure includes Li, Nb, 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 of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer disposed 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 of the present disclosure.