Garnet Oxide Electrolyte Composition for Simpler Cubic Phase Stabilization
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Solution Overview
Problem
The production of garnet-type oxides with high lithium ion conductivity requires rigorous control of raw materials and firing methods to stabilize the cubic crystal structure, making the process complex and difficult.
Innovation Solution
An oxide with a garnet-type crystal structure, belonging to space group I41/acd, having specific Li occupancy ranges of 8a sites (30-95%) and 16e sites (0-60%) and optionally containing Sr, is produced through a simplified method, which can be integrated into power storage devices with protective layers and electrolyte compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigorous control of raw materials and firing methods is applied to stabilize the cubic crystal structure, then high lithium ion conductivity is achieved, but the production process becomes complex and difficult
Solution Approach 1:
The invention changes the chemical composition parameters by introducing Sr substitution at the La site and controlling specific Li occupancy ratios at 8a and 16e sites. This parameter modification allows the material to stabilize in the cubic phase under simpler firing conditions while maintaining high lithium ion conductivity, thus resolving the contradiction between achieving high conductivity and simplifying production
Solution Approach 2:
The invention creates a composite oxide material with the formula Li7-xLaxZr2-ySryO12, combining multiple elements (Li, La, Zr, Sr) in specific ratios. This composite approach enables phase stabilization and high ion conductivity through synergistic effects of the constituent elements, reducing the need for complex processing controls
2Reliability
If element substitution is applied to stabilize the cubic phase, then high ion-conductive property is achieved, but preparation and firing control must be rigorous
Solution Approach 1:
By modifying the chemical composition through Sr substitution and controlling Li occupancy at specific sites, the invention changes the thermodynamic stability parameters of the crystal structure. This allows the cubic phase to be stabilized at lower temperatures and with broader compositional tolerances, reducing the precision requirements for firing control while maintaining high ion conductivity
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
This approach enables the production of high-ion conductivity oxides in a simpler manner, enhancing the stability and performance of power storage devices by stabilizing the cubic phase and improving lithium ion mobility.
Implementation Method 1
an oxide which has a garnet-type crystal structure including Li, Zr, and La exhibits high chemical stability and a lithium ion-conductive property
Data Source
AI summary
An oxide which has a garnet-type crystal structure including Li, La, and Zr, in which the crystal structure belongs to a space group I41/acd, a percent Li occupancy of 8a sites is 30% or more and 95% or less, and a percent Li occupancy of 16e sites is 60% or less (excluding 0%).