Lithium-Ion Conducting Material Ratio for Stable Sulfide Electrolytes
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Solution Overview
Problem
Conventional lithium ion conducting materials face limitations in lithium ion conductive properties and thermal stability.
Innovation Solution
A lithium ion conducting material comprising cyclic carbonate as a solvent and lithium amide salt, with a molar ratio of the lithium amide salt to cyclic carbonate between 0.25 and 0.33, and optionally including a sulfide solid electrolyte, to enhance thermal stability and lithium ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lithium ion conducting materials are used, then basic electrolyte function is provided, but lithium ion conductive properties and thermal stability are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratio of lithium amide salt to cyclic carbonate within 0.25-0.33, and by selecting specific lithium amide salts (lithium bisfluorosulfonylamide or lithium bistrifluoromethanesulfonylamide) to achieve optimal balance between thermal stability and lithium ion conductivity. This quantitative parameter optimization resolves the contradiction between reliability and productivity.
Solution Approach 2:
The patent creates a composite electrolyte system by combining cyclic carbonate solvent with lithium amide salt in specific proportions, forming a new material composition that exhibits both high thermal stability and excellent lithium ion conductive properties. The composite approach allows synergistic effects that overcome the limitations of conventional single-component electrolytes.
2Productivity
If lithium amide salt concentration is increased to improve conductivity, then lithium ion conductive properties improve, but reactivity with sulfide solid electrolyte increases
Solution Approach 1:
The patent resolves this contradiction through precise parameter control by limiting the molar ratio of lithium amide salt to cyclic carbonate to 0.25-0.33. This optimized concentration range ensures sufficient lithium ion conductivity while preventing excessive reactivity with sulfide solid electrolyte, achieving a balanced performance profile.
Solution Approach 2:
The cyclic carbonate acts as an intermediary medium that solvates lithium ions while moderating the interaction between lithium amide salt and sulfide solid electrolyte. This mediator approach allows high lithium ion conductivity to be achieved without direct harmful contact between reactive components.
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 achieves improved thermal stability and lithium ion conductive properties, while minimizing reactivity with the sulfide solid electrolyte, ensuring high performance in lithium ion secondary batteries.
Implementation Method 1
a lithium amide salt dissolved in the cyclic carbonate
Data Source
AI summary
Disclosed is a lithium ion conducting material having lithium ion conductive properties and thermal stability. The lithium ion conducting material of the present disclosure comprises a cyclic carbonate as a solvent and a lithium amide salt dissolved in the cyclic carbonate, wherein a molar ratio of the lithium amide salt to the cyclic carbonate is greater than 0.25 and 0.33 or less.