Hafnium-Based Solid Electrolyte for Stable Lithium-Air Batteries
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Solution Overview
Problem
Lithium air batteries using lithium lanthanum titanium phosphate solid electrolytes are unstable due to the presence of LiOH, leading to mechanical deterioration and reduced performance.
Innovation Solution
A solid electrolyte with a perovskite crystal structure represented by Formula LiyMzHfO3-x, where M is a divalent or trivalent element, and 0≤x<3, 0<y<1, 0<z<1, is developed, which includes a hafnium-based oxide to enhance stability and ion conductivity, preventing mechanical deterioration and maintaining reversibility in lithium air batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium lanthanum titanium phosphate solid electrolyte is used in lithium air battery, then ion conductivity is achieved, but stability deteriorates due to LiOH presence causing mechanical deterioration
Solution Approach 1:
The patent changes the chemical composition parameters of the solid electrolyte by incorporating hafnium oxide (HfO2) along with lithium lanthanum titanium phosphate (LLTP), modifying the stoichiometric ratios and material composition to achieve both high ion conductivity and stability against LiOH, thereby resolving the contradiction between reliability and mechanical strength
Solution Approach 2:
The patent creates a composite solid electrolyte material combining multiple components (lithium lanthanum titanium phosphate and hafnium oxide) to achieve synergistic effects where the composite structure provides both the ion conductivity needed for battery operation and the chemical stability required to resist mechanical deterioration from LiOH
2Duration of action of moving object
If conventional solid electrolyte is used, then battery operation is enabled, but reversibility is lost due to mechanical deterioration
Solution Approach 1:
The patent modifies the chemical and physical parameters of the solid electrolyte through controlled synthesis conditions, temperature, and composition ratios to achieve a material that maintains structural integrity during charge-discharge cycles, enabling reversible operation without mechanical deterioration
Solution Approach 2:
The composite structure of lithium lanthanum titanium phosphate with hafnium oxide provides enhanced structural stability that prevents mechanical deterioration during repeated cycling, thereby maintaining both reversibility and structural integrity over extended battery operation
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 solid electrolyte exhibits improved stability and ion conductivity, maintaining reversibility and structural integrity in lithium air batteries, even in humid and atmospheric conditions, and is resistant to moisture and strong bases.
Implementation Method 1
a solid electrolyte having improved stability in the presence of lithium
Data Source
AI summary
A solid electrolyte including: an oxide represented by Formula 1LiyMzHfO3-x Formula 1wherein, in Formula 1,M is a divalent element, a trivalent element, or a combination thereof, and0≤x<3, 0<y<1, and 0<z<1.