Garnet Composite Oxide Synthesis With High Crystallinity
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Solution Overview
Problem
Existing methods for producing composite metal oxides, such as YAG fluorescent materials, face limitations in achieving high crystallinity using mechanochemical methods, which restrict their performance in applications like solid electrolytes for secondary batteries.
Innovation Solution
A mechanochemical method is developed to produce a garnet-type composite metal oxide comprising Li, La, Zr, and O, with optional Al and Ga, by treating raw material powders and a flux under specific conditions, including the use of a bottomed cylindrical vessel with a rotor and end blade, to enhance crystallinity and ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a mechanochemical method is used to produce YAG fluorescent material, then the production process can be simplified and firing is not required, but the crystallinity of the produced crystal is insufficient
Solution Approach 1:
The invention changes the chemical composition parameters by introducing Li and Zr elements into the garnet structure to form Li7-xLaxZr2-yAlyO12 composite metal oxide. This compositional modification enables the material to achieve high crystallinity through mechanochemical treatment alone, resolving the contradiction between process simplicity and crystallinity quality
Solution Approach 2:
The invention creates a composite metal oxide system combining Li, La, Zr, and Al elements in a garnet-type structure. This composite approach leverages the synergistic effects of different elements to achieve superior crystallinity and ion conductivity that cannot be obtained with single-element systems, while maintaining the simplified mechanochemical production process
2Manufacturing precision
If conventional mixing and burning methods are used to produce composite metal oxide, then high crystallinity can be achieved, but the production process becomes complex and time-consuming
Solution Approach 1:
The invention extracts and eliminates the high-temperature firing step from the conventional production process. By using mechanochemical treatment alone with the specific Li-La-Zr-Al composition, the method achieves high crystallinity without requiring complex firing equipment and processes, thus simplifying the overall production system while maintaining product quality
Solution Approach 2:
The invention replaces the thermal energy-based firing process with a mechanical energy-based mechanochemical treatment process. The mechanical grinding and impact forces induce solid-state reactions and crystal formation directly, substituting the complex thermal processing system with a simpler mechanical treatment system that achieves equivalent or superior crystallinity
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 method achieves a garnet-type composite metal oxide with superior crystallinity and ion conductivity, enabling its use as a solid electrolyte material for secondary batteries with improved performance and stability.
Implementation Method 1
a step of treating a mixture comprising raw material powders and a flux by a mechanochemical method to react the raw material powders
Implementation Method 2
the mixture comprising the raw material powders and the flux is sheared while being compressed in the clearance by rotating the rotor
Data Source
AI summary
One or more embodiments of the present invention are to provide a method for producing a composite metal oxide having an excellent crystallinity by a mechanochemical method. One or more embodiments of the present invention relate to a method for producing a garnet-type composite metal oxide containing Li, La, Zr and O. The method includes a step of treating a mixture containing raw material powders and a flux by a mechanochemical method to react the raw material powders, and the raw material powders contain a Li source powder, a La source powder and a Zr source powder. The raw material powders may further contain at least one selected from an Al source powder and a Ga source powder.