Composite Solid Electrolyte for Low-Temperature Sintered Batteries
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Solution Overview
Problem
Conventional solid electrolytes in all solid state batteries exhibit insufficient ionic conductivity when fired at low temperatures.
Innovation Solution
Incorporating a lithium ion conductive material with a garnet-type structure, a LISICON-type structure, and a compound containing Li and B in the solid electrolyte, promoting liquid-phase sintering and densification at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the solid electrolyte is fired at low temperatures, then the manufacturing cost and energy consumption are reduced, but the ionic conductivity is insufficient
Solution Approach 1:
The patent employs a composite solid electrolyte system combining garnet-type lithium ion conductive material with LISICON-type lithium ion conductive material. This composite structure enables low-temperature firing while achieving high ionic conductivity, as the LISICON-type material forms a liquid phase that promotes sintering and densification at reduced temperatures, thereby resolving the contradiction between low firing temperature and sufficient ionic conductivity
Solution Approach 2:
The patent modifies the chemical composition parameters of the solid electrolyte by incorporating specific ratios of garnet-type material, LISICON-type material, and Li-B compounds. By adjusting these compositional parameters, the material achieves optimal ionic conductivity at low firing temperatures, transforming the physical and chemical properties to enable low-temperature processing without sacrificing performance
2Temperature
If the solid electrolyte contains garnet-type material and Li3BO3, then it can be sintered at low temperatures, but the ionic conductivity cannot be sufficiently increased
Solution Approach 1:
The patent enhances the composite material system by adding LISICON-type lithium ion conductive material to the existing garnet-type material and Li3BO3 combination. The LISICON-type material contributes additional lithium ion conduction pathways and forms liquid phase during sintering, which significantly improves ionic conductivity while maintaining low sintering temperature capability
Solution Approach 2:
The patent creates local liquid phase regions within the solid electrolyte composite during low-temperature sintering. The LISICON-type material and Li-B compounds form localized liquid phases that facilitate ion transport and densification in specific regions, thereby achieving high overall ionic conductivity through localized quality enhancement
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
Achieves high ionic conductivity in all solid state batteries even when fired at low temperatures, maintaining crystal structure integrity and reducing conduction resistance.
Implementation Method 1
a lithium ion conductive material having a garnet-type structure, a lithium ion conductive material having a LISICON-type structure
Implementation Method 2
can be sintered at low temperatures
Data Source
AI summary
A solid electrolyte that includes a lithium ion conductive material having a garnet-type structure, a lithium ion conductive material having a LISICON-type structure, and a compound containing Li and B.