Phosphorus-Modified Ionic Liquid Electrolyte for Battery Safety
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Solution Overview
Problem
Lithium-ion batteries face safety challenges due to flammability under abuse or normal conditions, and existing solutions do not effectively incorporate flame retardant ionic liquids into their electrolytes.
Innovation Solution
Development of an ionic liquid with a phosphorus moiety-based electrolyte for lithium-ion batteries, comprising an aprotic organic solvent, an alkali metal salt, and additives such as sulfur, phosphorus, or silicon-containing compounds, which enhances thermal stability and flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used in lithium-ion batteries, then good electrochemical performance is achieved, but flammability and safety issues occur under abuse or normal conditions
Solution Approach 1:
The patent modifies the chemical composition parameters of the electrolyte by incorporating phosphorus-containing compounds (such as phosphates, phosphonates, or phosphinic acids) at specific concentrations (0.1-10 wt%). This parameter change transforms the electrolyte's fire resistance properties while maintaining its electrochemical functionality, directly resolving the contradiction between safety and flammability.
Solution Approach 2:
The patent creates a composite electrolyte system by combining conventional electrolyte components (lithium salt, aprotic solvent) with phosphorus-containing flame retardant additives. This composite approach integrates the electrochemical benefits of conventional electrolytes with the safety advantages of phosphorus-based flame retardants, simultaneously achieving good performance and reduced flammability.
2Object-affected harmful factors
If flame retardant additives are added to improve safety, then flammability is reduced, but electrolyte complexity and potential performance degradation occur
Solution Approach 1:
The patent optimizes the concentration parameter of phosphorus-containing additives within a specific range (0.1-10 wt%, preferably 0.5-5 wt%). By controlling this parameter, the patent achieves effective flame retardancy while avoiding excessive complexity and potential performance degradation from over-addition, thus resolving the contradiction between safety improvement and system complexity.
3Temperature
If phosphorus-containing compounds are added to reduce flammability, then thermal stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs commercially available phosphorus-containing compounds (phosphates, phosphonates, phosphinic acids) that can be directly added to the electrolyte formulation without requiring complex in-situ synthesis. This approach simplifies manufacturing by using off-the-shelf additives rather than requiring complex chemical synthesis processes, thus resolving the contradiction between thermal stability improvement and manufacturing ease.
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 phosphorus-containing ionic liquid electrolyte improves thermal stability and reduces flammability, providing a safer and more effective electrolyte solution for lithium-ion batteries.
Implementation Method 1
the phosphorus-containing ionic liquid electrolyte improves thermal stability and reduces flammability
Data Source
AI summary
The present disclosure is directed to a phosphorus-modified ionic liquid compound, the synthesis thereof and an electrochemical cell electrolyte containing the phosphorus-modified ionic liquid compound.