High-Density Solid Electrolyte for Lithium Ion Batteries
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Summary
Problems
Current solid electrolytes for all-solid-state lithium ion secondary batteries face challenges in achieving high density and high lithium ion conductivity, particularly at low temperatures, due to grain boundary resistance and interface resistance, and existing methods struggle to produce high-density compacts with low activation energy.
Innovation solutions
A complex oxide with a monoclinic crystal structure, represented by Li4−xSr2−xLaxZrO6, is produced using a rapid cooling method with infrared condensed heating, resulting in a high-density single crystal with low activation energy and high ion conductivity, which can be easily cut to thin pieces for use as a solid electrolyte.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If cubic garnet-type structure materials are used as solid electrolytes, then high lithium ion conductivity at room temperature is achieved, but high-density compact production is difficult and grain boundary resistance is high
Why choose this principle:
The invention changes the crystal structure parameter from cubic garnet-type to monoclinic structure, and modifies the chemical composition parameters by incorporating Sr and La elements in specific ratios (Li4-xSryLazZrO6 where y=1.2 and z=1.2), achieving both high density and high lithium ion conductivity with low activation energy
Principle concept:
If cubic garnet-type structure materials are used as solid electrolytes, then high lithium ion conductivity at room temperature is achieved, but high-density compact production is difficult and grain boundary resistance is high
Why choose this principle:
The invention creates a composite oxide material by combining multiple elements (Li, Sr, La, Zr, O) in a specific monoclinic structure, where the composite nature of the material enables simultaneous achievement of high density, high ion conductivity, and low activation energy that cannot be achieved with single-element or simpler composite structures
Application Domain
Data Source
AI summary:
A complex oxide with a monoclinic crystal structure, represented by Li4−xSr2−xLaxZrO6, is produced using a rapid cooling method with infrared condensed heating, resulting in a high-density single crystal with low activation energy and high ion conductivity, which can be easily cut to thin pieces for use as a solid electrolyte.
Abstract
Provided is a complex oxide having high density and high lithium ion conductivity and low activation energy. The complex oxide has a chemical composition represented by Li 4−x Sr 2−x La x ZrO 6 (0≤x≤1.0) and belongs to a monoclinic space group P2 1 /n. The relative density of this complex oxide can be made to be 100%. The lithium ion conductivity of this complex oxide can be made to be 6.0×10 −4 S/cm or more. This complex oxide is produced by melting at least a part of a raw material having a chemical composition represented by Li (4−x)y Sr (2−x)z La x ZrO 6 (0≤x≤1.0, 1<y and 1<z) to form a molten portion and moving the molten portion at a movement speed of 8 mm/h or faster.