Fluoride Ion Battery Electrolyte Solvent Composition
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Solution Overview
Problem
Carbonate-based solvents in fluoride ion batteries are prone to decomposition, leading to low charge and discharge efficiency due to instability and reaction with active fluoride anions, which affects the stability of the solid electrolyte interphase (SEI) layer.
Innovation Solution
A liquid electrolyte for fluoride ion batteries is formulated using specific combinations of carbonate-based solvents such as propylene carbonate (PC) and dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC), or ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC), which form a stable SEI layer, reducing solvent decomposition and enhancing charge and discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbonate-based solvents are used in fluoride ion battery electrolyte, then the electrolyte can conduct fluoride ions, but the solvent decomposes easily leading to low stability and poor cycle performance
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by selecting specific combinations of carbonate-based solvents (PC-DMC, EC-EMC, or EMC-DMC systems) rather than using single solvents or other combinations. This parameter optimization reduces solvent decomposition while maintaining fluoride ion conductivity, thereby improving both reliability and compositional stability.
Solution Approach 2:
The patent employs composite electrolyte systems by combining multiple carbonate-based solvents in specific ratios. These composite solvent systems (PC-DMC, EC-EMC, or EMC-DMC) create synergistic effects that enhance overall stability and reduce decomposition compared to individual solvents, while preserving the necessary ionic conductivity.
2Productivity
If carbonate-based solvents are used in the electrolyte, then fluoride ion conduction is enabled, but decomposition occurs leading to low charge and discharge efficiency
Solution Approach 1:
By optimizing the composition parameters of the carbonate-based solvent system (selecting specific binary combinations and their ratios), the patent minimizes decomposition reactions that cause energy loss. The chosen solvent systems achieve better stability profiles while maintaining adequate ionic conductivity, thereby improving charge-discharge efficiency and reducing energy waste.
Solution Approach 2:
The patent converts the inherent decomposition tendency of carbonate-based solvents into a beneficial outcome by selecting specific solvent combinations that, while still prone to some decomposition, form more stable intermediate products and fewer harmful byproducts. This controlled decomposition approach reduces energy loss and improves overall battery efficiency.
3Reliability
If conventional carbonate-based solvents are used, then the electrolyte formulation is simple, but solvent decomposition leads to poor SEI layer stability
Solution Approach 1:
The patent uses composite electrolyte formulations consisting of binary combinations of carbonate-based solvents. These composite systems create more stable solid electrolyte interphase (SEI) layers compared to single solvents, improving reliability. The formulations remain relatively simple, avoiding complex multi-component systems.
Solution Approach 2:
The patent optimizes the compositional parameters of the electrolyte by selecting specific binary solvent ratios. This parameter optimization enhances SEI layer stability without requiring complex formulations, achieving better reliability while maintaining formulation simplicity.
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 use of these solvent combinations in the fluoride ion battery electrolyte improves cycle stability and coulomb efficiency by restraining solvent decomposition and minimizing side reactions, resulting in improved charge and discharge performance.
Implementation Method 1
a liquid electrolyte for a fluoride ion battery comprising a plurality of carbonate-based solvents and a fluoride salt
Implementation Method 2
carbonate-based solvents are low in stability against reduction and decomposition therein easily occurs
Data Source
AI summary
An object of the present disclosure is to provide a liquid electrolyte for a fluoride ion battery in which decomposition of a solvent is restrained. The present disclosure attains the object by providing a liquid electrolyte for a fluoride ion battery comprising a plurality of carbonate-based solvents and a fluoride salt, wherein the plurality of carbonate-based solvents contain: i) only propylene carbonate (PC) and dimethyl carbonate (DMC), ii) only ethylene carbonate (EC) and ethyl methyl carbonate (EMC), or iii) only ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC).