Li-Al-O Coated Solid Electrolyte Powder for Mother-Powder-Free Sintering
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Solution Overview
Problem
Conventional methods for fabricating oxide-based solid electrolytes face issues such as lithium volatilization, structural instability, and high production costs due to the use of mother powder and external pressure techniques, which compromise sinterability and ionic conductivity.
Innovation Solution
A sol-gel method is used to coat the surface of oxide-based solid electrolyte powder with a Li—Al—O compound, allowing direct sintering without mother powder, enhancing structural stability and sinterability, and resulting in a high-density sintered body with a cubic phase structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If long-duration high-temperature heat treatments are employed, then sintering is achieved, but lithium volatilization occurs and structural stability is compromised
Solution Approach 1:
A Li-Al-O compound coating layer is applied to the powder surface before sintering. This preliminary action creates a protective barrier that prevents lithium volatilization during subsequent high-temperature heat treatment, allowing sintering to proceed without material loss.
Solution Approach 2:
The Li-Al-O compound coating layer acts as an intermediary between the oxide-based solid electrolyte powder and the high-temperature environment. It mediates the interaction by providing a protective interface that prevents direct lithium volatilization while still allowing the sintering process to occur.
2Reliability
If a large amount of mother powder is used, then structural collapse is prevented, but material consumption increases and production costs rise
Solution Approach 1:
The invention extracts and removes the mother powder from the sintering process. By applying a protective coating directly to the powder particles, the supporting matrix of mother powder becomes unnecessary, eliminating material waste while maintaining structural stability during sintering.
Solution Approach 2:
The oxide-based solid electrolyte powder becomes self-protecting through the coating layer. Instead of relying on external mother powder for structural support, the coated particles themselves maintain their integrity during sintering, enabling the process to proceed without additional material.
3Manufacturing precision
If external pressure techniques are applied, then sintering is achieved, but equipment costs increase and mass production becomes difficult
Solution Approach 1:
The invention replaces mechanical pressure systems with a chemical/protection-based approach. The Li-Al-O coating layer provides protective function during conventional atmospheric pressure sintering, eliminating the need for complex hot pressing or spark plasma sintering equipment while achieving comparable or superior results.
4Productivity
If rapid sintering is performed, then production time is reduced, but equipment complexity and cost increase
Solution Approach 1:
The protective coating enables conventional sintering furnaces to achieve high-density sintered bodies without requiring specialized rapid sintering equipment. The coating maintains particle integrity and promotes densification during standard heating rates, making the process suitable for mass production.
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 method achieves a high shrinkage ratio of 21% and relative density of 96.1%, with improved ionic conductivity (1.01×10−3 S/cm) and electronic conductivity (7.59×10−10 S/cm), and supports large-scale production of high-energy-density solid-state batteries.
Implementation Method 1
A sol-gel method is used to coat the surface of oxide-based solid electrolyte powder with a Li—Al—O compound
Implementation Method 2
sintering the coated powder without using any mother powder
Data Source
AI summary
Provided is an oxide-based solid electrolyte powder including a base powder, and a coating layer on a surface of the base powder, wherein the coating layer including a Li—Al—O compound, and a method for manufacturing an oxide-based solid electrolyte sintered body including coating a base powder with a material comprising a Li—Al—O compound to form a coated powder, and sintering the coated powder, wherein the sintering is performed without a mother powder.