Lithium-Ion Conductive Composite Electrolyte for Stable Ion Transport
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Solution Overview
Problem
Conventional lithium ion conducting materials exhibit room for improvement in terms of lithium ion input/output characteristics.
Innovation Solution
A lithium ion conducting material comprising a composite of an electrolytic solution and a polymer, where the electrolytic solution includes a cyclic carbonate as a solvent and a lithium amide salt dissolved in it, with a molar ratio of the lithium amide salt to the cyclic carbonate ranging from 0.25 to 0.33, and optionally combined with a sulfide solid electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional lithium ion conducting materials are used, then basic electrolyte function is provided, but lithium ion input/output characteristics are insufficient
Solution Approach 1:
The patent applies composite materials by combining polymer electrolyte with sulfide solid electrolyte particles. The polymer electrolyte contains cyclic carbonate and chain carbonate solvents with lithium salt, forming a composite structure that leverages the ion conductivity of the polymer phase and the stability of the sulfide phase, thereby improving lithium ion input/output characteristics while maintaining reliability
Solution Approach 2:
The patent employs parameter changes by optimizing the molar ratio of cyclic carbonate to chain carbonate in the polymer electrolyte, controlling lithium salt concentration within specific ranges, and adjusting the particle size and content of sulfide solid electrolyte. These parameter optimizations enable the composite to achieve superior lithium ion conductivity and input/output performance
2Reliability
If lithium salt concentration is increased to improve conductivity, then ion transport is enhanced, but material stability and thermal properties deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the lithium salt concentration within 1.0 to 3.0 mol/L and optimizing the molar ratio of cyclic carbonate to chain carbonate between 1:4 and 1:1. This balanced parameter selection achieves high ion conductivity while maintaining thermal stability and preventing electrolyte decomposition
Solution Approach 2:
The composite structure of polymer electrolyte and sulfide solid electrolyte particles provides dual benefits: the polymer phase ensures flexibility and ion solvation, while the sulfide particles enhance thermal stability and structural rigidity, allowing the system to maintain stability even at optimized lithium salt concentrations
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 material exhibits excellent lithium ion input/output characteristics, enhanced thermal stability, and reduced reactivity with sulfide solid electrolytes.
Implementation Method 1
a lithium amide salt dissolved in the cyclic carbonate
Data Source
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AI summary
Disclosed is a lithium ion conducting material excellent in lithium ion input/output characteristics. The lithium ion conducting material of the present disclosure comprises a composite of a polymer and an electrolytic solution. The electrolytic solution comprises a cyclic carbonate as a solvent and a lithium amide salt dissolved in the cyclic carbonate. A molar ratio of the lithium amide salt to the cyclic carbonate is greater than 0.25 and 0.33 or less.