Garnet Solid Electrolyte Precursor Composition for Uniform Metal Deposition
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Solution Overview
Problem
Existing garnet-type solid electrolytes for lithium-ion batteries face challenges in maintaining lithium ion conduction properties due to non-uniform deposition of metals during the synthesis process, leading to potential generation of byproducts and non-uniform regions.
Innovation Solution
A precursor solution for a garnet-type solid electrolyte is developed, comprising a specific compositional formula with a single solvent and precise ratios of lithium, lanthanum, zirconium, gallium, and neodymium compounds, ensuring uniform deposition and improved lithium ion conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple types of organic solvents are used for each metal compound solution, then the solubility of different metal compounds is improved, but the uniformity of metal deposition deteriorates
Solution Approach 1:
The patent applies homogeneity by using a single type of organic solvent for all metal compound solutions instead of different solvents for each metal compound. This ensures that all metals are dissolved in the same solvent environment, leading to uniform deposition during the drying process and preventing non-uniform regions in the solid electrolyte.
Solution Approach 2:
The patent uses a single organic solvent that serves as the universal solvent for all metal compounds (lithium, lanthanum, zirconium, gallium, and neodymium compounds). This universal solvent approach eliminates the need for multiple different solvents and ensures consistent deposition behavior across all metal elements.
2Productivity
If solvent drying is performed, then the solid electrolyte is formed, but non-uniform deposition and byproduct generation occur due to differential evaporation rates
Solution Approach 1:
By using a single organic solvent type for all metal compounds, the patent ensures that all components evaporate at similar rates during the drying process. This homogeneous evaporation prevents preferential deposition of certain metals and eliminates non-uniform regions and byproducts in the final solid electrolyte.
3Reliability
If the amount of lithium compound is adjusted to 1.05-1.30 times the stoichiometric composition, then lithium ion conduction property is improved, but the compositional precision requirement increases
Solution Approach 1:
The patent optimizes the lithium compound amount to a specific range (1.05-1.30 times the stoichiometric composition) to ensure sufficient lithium content for good ion conduction while accounting for potential lithium loss during processing. This parameter optimization balances performance requirements with manufacturing feasibility.
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 solution enhances the lithium ion conduction property of the solid electrolyte, reduces the likelihood of byproduct generation and non-uniform regions, and improves the overall performance of lithium-ion batteries.
Implementation Method 1
when the solid electrolyte precursor solution is subjected to solvent drying, evaporation starts from the organic solvent having a low boiling point
Data Source
AI summary
A precursor solution of a garnet-type solid electrolyte is provided that is represented by the following compositional formula, and contains one type of solvent, and a lithium compound, a lanthanum compound, a zirconium compound, a gallium compound, and a neodymium compound, each of which has solubility in the solvent, wherein with respect to the stoichiometric composition of the following compositional formula, the amount of the lithium compound is 1.05 times or more and 1.30 times or less, and the amounts of the lanthanum compound, the zirconium compound, the gallium compound, and the neodymium compound are equal,(Li7−3xGax)(La3−yNdy)Zr2O12 provided that the following relationships are satisfied: 0.1≤x≤1.0 and 0.0<y≤0.2.