Composite Solid Electrolyte for Low-Temperature Lithium-Ion Conduction
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Solution Overview
Problem
Existing technologies face challenges in achieving high lithium ion conductivity while using a sintering temperature of not more than 600°C, both in the case of single and combined solid electrolyte materials.
Innovation Solution
A lithium ion conductor composite material comprising a first lithium ion conductor with higher ion conductivity and a second lithium ion conductor with lower sintering temperature is used, where the first conductor has a sintering temperature above 600°C and the second conductor has a sintering temperature below 600°C, allowing for high ion conductivity at or below 600°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature sintering (not less than 700°C) is used to achieve high ion conductivity in oxide-based solid electrolytes, then ion conductivity is improved, but harmful reactions occur between electrode active material and oxygen in the solid electrolyte
Solution Approach 1:
The invention uses a composite solid electrolyte consisting of a crystal phase (perovskite or garnet type) and a glass ceramic phase. The glass ceramic component acts as a low-temperature sintering aid that enables the crystal phase to form and achieve high ion conductivity at temperatures of 600°C or lower, preventing harmful reactions while maintaining excellent ion conductivity
Solution Approach 2:
The invention changes the sintering temperature parameter from the conventional high temperature (700°C or higher) to a lower temperature (600°C or lower) by introducing a glass ceramic phase. This parameter change is achieved by controlling the composition ratios of the crystal phase and glass ceramic phase, where the glass ceramic phase serves as a flux that lowers the sintering temperature while still enabling the formation of the high-conductivity crystal phase
2Object-affected harmful factors
If sintering temperature is reduced to or below 600°C to prevent harmful reactions, then harmful reactions are suppressed, but ion conductivity becomes insufficient
Solution Approach 1:
The composite structure combines a crystal phase (which provides high ion conductivity when properly formed) with a glass ceramic phase (which enables low-temperature sintering). The glass ceramic acts as a sintering aid that facilitates the formation of the crystal phase at low temperatures, thereby achieving both low sintering temperature and high ion conductivity simultaneously
Solution Approach 2:
The glass ceramic phase serves as an intermediary substance that mediates between the low sintering temperature requirement and the high ion conductivity requirement. It acts as a flux or sintering aid that enables the crystal phase to form and sinter properly at temperatures of 600°C or lower, which would otherwise be insufficient for achieving high ion conductivity
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
This approach enables high lithium ion conductivity while maintaining a sintering temperature below 600°C, preventing reactions between the electrode active material and oxygen in the solid electrolyte, enhancing battery safety and design flexibility.
Implementation Method 1
a first lithium ion conductor (1) and a second lithium ion conductor (2), the lithium ion conductivity of which is higher than that of the second lithium ion conductor (2)
Implementation Method 2
it is necessary to sinter the solid electrolyte at a high temperature of not less than 700°C
Data Source
Figure 1~2B
Figure 3
AI summary
A lithium ion conductor includes a first lithium ion conductor that contains at least one selected from among oxide crystals and glass ceramics, and a second lithium ion conductor that has a sintering temperature of not more than 600°C. The lithium ion conductivity of the first lithium ion conductor is higher than the lithium ion conductivity of the second lithium ion conductor.