Garnet Oxide Electrolyte with Tetragonal Phases for Simpler Production
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The preparation of raw materials and firing methods for producing garnet-type oxide with Li, Zr, and La require rigorous control to stabilize the cubic system, making the process complex and difficult to manage.
Innovation Solution
The development of an oxide with a garnet-type crystal structure that includes at least two tetragonal phases with different lattice constants, allowing for a simpler production method and increased ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigorous control of raw material preparation and firing method is applied to stabilize the cubic system, then the chemical stability and lithium ion-conductive property are improved, but the manufacturing complexity increases
Solution Approach 1:
The invention changes the crystal system parameter from cubic to tetragonal, which fundamentally alters the manufacturing requirements. The tetragonal system allows for broader compositional ranges and less stringent firing conditions while maintaining high lithium ion conductivity, thus resolving the contradiction between reliability and manufacturing complexity
Solution Approach 2:
The invention uses a composite oxide system containing Li, La, Zr, and optionally Sr, where the combination of these elements in a tetragonal garnet structure achieves both chemical stability and high ion conductivity without requiring the rigorous control needed for cubic systems. The multi-element composition provides structural flexibility that simplifies manufacturing
2Reliability
If rigorous control of raw material preparation and firing method is applied to stabilize the cubic system, then the lithium ion-conductive property is improved, but the ease of manufacture deteriorates
Solution Approach 1:
By changing the crystal system from cubic to tetragonal, the invention modifies the structural parameters that govern both ion conductivity and manufacturing ease. The tetragonal structure maintains adequate ion conductivity pathways while allowing for simpler raw material preparation and firing processes with broader parameter tolerances
Solution Approach 2:
The invention allows different regions of the compositional space to be explored in the tetragonal system, where certain compositions within the Li-La-Zr-Sr oxide system provide optimal balance between ion conductivity and manufacturing ease, without requiring uniform rigorous control across all parameters
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 an oxide with high ion conductivity, simplifying the manufacturing process and improving the performance of power storage devices.
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
Figure 1
Figure 2
Figure 3
AI summary
Provided are an oxide, an electrolyte composition, and a power storage device, all of which can be manufactured by simple methods. The oxide has a garnet-type crystal structure containing Li, La, and Zr, and the crystal structure has at least two tetragonal crystal phases that are different in lattice constant. The crystal structure belongs to a space group I41/acd, and the occupancy proportion of Li at an 8a site in at least one of the tetragonal crystal phases may be 95% or less. The oxide may contain Sr. The electrolyte composition and the power storage device contain said oxide.