Oxyhalide Solid Electrolyte Layers for Low-Resistance Lithium Interfaces
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Solution Overview
Problem
Solid state lithium batteries face challenges due to the limited wettability of solid electrolytes by lithium metal, leading to increased interfacial resistance, uneven lithium plating, and the formation of lithium dendrites, which result in mechanical stress and reduced performance.
Innovation Solution
A solid electrolyte material comprising an oxyhalide material overlying a halide material with specific chemical compositions and structures, such as Li7O2X3, is developed to enhance ionic conductivity and stability, facilitating improved performance and capacity retention in solid-state batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solid electrolyte is used in lithium metal anode, then energy density and recharging speed are improved, but interfacial resistance increases due to limited wettability
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating specific ratios of LiF, LiOH, and LiX to optimize both ionic conductivity and interfacial compatibility with lithium metal, thereby reducing interfacial resistance while maintaining high recharging speed
Solution Approach 2:
The patent creates a composite solid electrolyte material combining multiple components (LiF, LiOH, LiX) in specific proportions to achieve synergistic effects that simultaneously improve wettability with lithium metal and maintain high ionic conductivity for fast recharging
2Reliability
If solid electrolyte interfaces with lithium metal anode, then battery performance is improved, but mechanical stress increases due to uneven lithium plating
Solution Approach 1:
The patent adjusts the chemical composition parameters of the solid electrolyte to achieve optimal lithium ion transport properties that enable uniform lithium plating during cycling, thereby reducing mechanical stress while maintaining high battery performance
Solution Approach 2:
The solid electrolyte acts as an intermediary layer between lithium metal anode and cathode, with its optimized composition facilitating smooth lithium ion flux that prevents uneven plating and reduces mechanical stress on the battery structure
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 improves ionic conductivity and stability, reducing interfacial resistance and mechanical stress, thereby enhancing the performance and cycle life of solid-state lithium batteries.
Implementation Method 1
the first solid electrolyte material may include improved ionic conductivity comparing to a corresponding solid electrolyte material that has a single phase
Data Source
AI summary
A solid electrolyte material may include a first solid electrolyte material overlying at least a portion of a second solid electrolyte material. The first solid electrolyte material may include MaMefObXc, wherein M comprises an alkali metal, X comprises a halogen, 0≤f≤1, (a/b)>3, c=a+(k×f)−2b, k is a valence of Me, and Me comprises a metal different from M. The second solid electrolyte material may include a halide.