Halogen-Doped Garnet Oxide Solid Electrolyte
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Solution Overview
Problem
Current oxide-based solid electrolytes for lithium-ion batteries have limited ion conductivity, making it difficult to achieve high safety and performance, especially compared to sulfide-based electrolytes.
Innovation Solution
A lithium ion-conducting garnet type oxide composition comprising Li, La, Ga, Zr, and a halogen element, with specific proportions and structures, is developed to enhance ion conductivity beyond conventional levels, including a production method involving sintering at high temperatures to achieve a garnet-type crystal structure with improved lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oxide-based solid electrolyte compositions are used, then safety is maintained, but it is extremely difficult to improve ion conductance beyond 10^-4 S/cm
Solution Approach 1:
The invention creates a composite material system by combining the oxide-based solid electrolyte matrix with halogen elements (Cl, Br, or I). This composite approach, represented by the composition Li7-3xGaxLa3Zr2O12 containing 0.01-2.0 atom% halogen, enables simultaneous achievement of high safety (inherent to oxide-based systems) and high ion conductance (>10^-3 S/cm), resolving the contradiction between safety maintenance and conductance improvement.
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 new oxide-based solid electrolyte exhibits significantly improved lithium ion conductivity at room temperature, exceeding 1.0×10−3 S/cm, suitable for high-performance battery applications, while maintaining safety and stability.
Implementation Method 1
a lithium ion-conducting garnet type oxide: that contains lithium, lanthanum, zirconium as main constituent elements and further contains a halogen element
Implementation Method 2
a production method involving sintering at high temperatures to achieve a garnet-type crystal structure with improved lithium ion conductivity
Data Source
AI summary
An oxide-based solid electrolyte with a high lithium ion conductance is provided. A lithium ion-conducting garnet type oxide includes Li, La, Ga, Zr, a halogen element, and oxygen. A lithium ion conductivity at room temperature is not lower than 1.0×10−3 S/cm. A proportion of Ga with respect to 1 mole of the oxide may be not larger than 0.5 moles.The halogen element may be at least one type selected from the group consisting of Cl, Br, and I, and a proportion of Li with respect to 1 mole of the oxide may be not smaller than 6.1 moles and smaller than 6.5 moles.