Doped Solid-State Electrolyte Composition for Stable Lithium Anode Contact
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Solution Overview
Problem
Conventional solid-state batteries face issues with the detachment of the solid-state electrolyte from the anode, which affects their stability and safety, and existing materials often have low ionic conductivity.
Innovation Solution
A compound represented by Formula 1: Li4+dH+ < h Sr 2-x M1 a+< x Zr 1-y M2 b+< y O 6-z X c-< z, where M1 and M2 are cationic dopants in the Sr and Zr sites, and X is an anion dopant in the O site, providing enhanced ionic conductivity and stability against lithium metal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid-state electrolyte is used to improve safety, then safety is improved, but detachment from anode occurs
Solution Approach 1:
The patent modifies the chemical composition parameters of the solid-state electrolyte by incorporating specific dopants (M1, M2, X) into the Li4Sr2ZrO6 structure. This changes the physical and chemical properties of the electrolyte to improve both safety and adhesion to the anode, resolving the contradiction between safety improvement and detachment prevention.
Solution Approach 2:
The patent creates a composite solid-state electrolyte material by combining Li4Sr2ZrO6 with multiple dopants (M1 at Sr sites, M2 at Zr sites, and X at O sites). This composite approach enhances both the safety characteristics and the interfacial adhesion properties, simultaneously addressing both requirements.
2Reliability
If conventional solid-state electrolyte materials are used, then safety is improved, but ionic conductivity is low
Solution Approach 1:
The patent optimizes the ionic conductivity by carefully controlling the dopant concentrations and stoichiometric ratios in the Li4+dSr2-xM1a+xZr1-yM2b+ 106-zXc- 10z compound. The parameter optimization enables high ionic conductivity while maintaining the safety benefits of solid-state electrolytes.
Solution Approach 2:
The patent introduces localized dopant atoms at specific crystallographic sites (M1 at Sr sites, M2 at Zr sites, X at O sites) to create local structural modifications that enhance ion transport pathways. This local quality enhancement improves bulk ionic conductivity without compromising overall material safety.
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 compound achieves high ionic conductivity of about 0.3 mS/cm at room temperature and improved stability, reducing the risk of detachment and enhancing the performance of solid-state batteries.
Implementation Method 1
the compound has an ionic conductivity of about 0.3 mS/cm or greater at room temperature
Data Source
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AI summary
A compound represented by Formula 1: Li4+dH+hSr2-xM1a+xZr1-yM2b+yO6-zXc-z, wherein in Formula 1, M1 is a cationic dopant in Sr site with a valance of a+; a is 1, 2 or 3; M2 is a cationic dopant in Zr site with a valance of b+; b is 2, 3, 4 or 5; X is an anion dopant in O site with a valence of c-; c is 1, 2, or 3; 0 ≤ h ≤ 2, 0 ≤ x ≤ 2, 0 ≤ y ≤ 1, 0 ≤ z ≤ 0.5, x+y+z+h ≥ 0, d=(2-a)*x+(4-b)*y-(2-c)*z-h, and d ≥ 0.