Doped Lithium Chloride Solid Electrolyte for High-Temperature Ion Conductivity
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Solution Overview
Problem
Conventional lithium-containing chlorides with tetravalent metal elements exhibit limited ion conductivity at high temperatures, such as 100° C.
Innovation Solution
A lithium-containing chloride compound is developed, comprising lithium, a tetravalent metal element (preferably Zr), chlorine, and a dopant element (such as bromine or iodine), with a specific sea-island structure and X-ray diffraction peak characteristics, enhancing ion conductivity at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lithium-containing chlorides containing a tetravalent metal element are used, then the material structure is stable and safe, but the ion conductivity at high temperatures is insufficient
Solution Approach 1:
The patent applies parameter changes by introducing a dopant element X into the lithium-containing chloride structure. This dopant modifies the crystal lattice parameters and creates additional lithium ion conduction pathways, thereby improving high-temperature ion conductivity while maintaining the fundamental stable structure of the parent compound
Solution Approach 2:
The patent creates a composite material system by combining lithium-containing chloride with a dopant element X. This composite approach allows the base material to provide structural stability and safety while the dopant contributes enhanced ionic conductivity properties, resolving the contradiction between stability and conductive performance
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 improved lithium ion conductivity at high temperatures (60° C. to 100° C.) and maintains high ion conductivity across a wide temperature range, including room temperature, making it suitable for use in solid electrolytes and batteries.
Implementation Method 1
has a reflection peak in each of 2θ angle ranges of 15° to 17°, 31° to 32.5°, 41° to 42.5°, 48.5° to 50° and 53° to 55° in an X-ray diffraction chart measured using a CuKα ray at 25° C.
Data Source
AI summary
A compound containing lithium, a tetravalent metal element M, chlorine and a dopant element X and having a reflection peak in each of 2θ angle ranges of 15° to 17°, 31° to 32.5°, 41° to 42.5°, 48.5° to 50° and 53° to 55° in an X-ray diffraction chart measured using a CuKα ray at 25° C., in which a half width of a reflection peak having a largest peak height in the 15° to 17° range is 0.35° to 3.00°.