Fluoride Ion Battery Electrolyte Stabilization
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Solution Overview
Problem
Fluoride ions in fluoride ion batteries have low stability due to high reactivity, leading to inadequate reaction with active materials as they react with the liquid electrolyte before interacting with the active material.
Innovation Solution
A liquid electrolyte comprising a fluoride salt and a diol compound with one or two ether bonds between OH groups, which improves fluoride ion stability by selectively interacting with fluoride ions and preventing excessive binding, allowing stable battery reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If fluoride ion is used in the battery, then high voltage and high energy density are achieved, but fluoride ion stability deteriorates due to high reactivity with liquid electrolyte
Solution Approach 1:
The patent introduces a specific liquid electrolyte composition as an intermediary between the fluoride ion and the battery components. The electrolyte contains a fluoride salt dissolved in a specific solvent mixture (cyclic carbonate and chain carbonate in a volume ratio of 9:1 to 1:9) with a concentration of 0.1 to 2.0 mol/L. This intermediary medium allows the fluoride ion to maintain stability while still enabling high voltage operation, resolving the contradiction between achieving high power and maintaining ion stability.
2Stability of the object's composition
If fluoride ion reacts with liquid electrolyte, then fluoride ion stability improves through interaction, but reaction with active material is insufficient due to premature consumption
Solution Approach 1:
The patent optimizes multiple parameters of the liquid electrolyte to resolve this contradiction. The fluoride salt concentration is controlled at 0.1 to 2.0 mol/L, the solvent ratio (cyclic to chain carbonate) is maintained at 9:1 to 1:9, and the operating temperature is kept at 40°C or lower. These parameter changes create optimal conditions where the fluoride ion achieves sufficient stability through controlled interaction with the electrolyte while preserving enough reactivity to efficiently react with the active material, thereby improving both stability and productivity.
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 this electrolyte enhances fluoride ion stability, enabling higher capacity batteries with improved Coulomb efficiency and reduced generation of hydrofluoric acid (HF).
Implementation Method 1
a liquid electrolyte for a fluoride ion battery comprising a fluoride salt and a diol compound in which one or two ether bonds are disposed between two OH groups
Data Source
AI summary
An object of the present invention is to provide a liquid electrolyte for a fluoride ion battery with improved fluoride ion stability. By providing a liquid electrolyte for a fluoride ion battery comprising a fluoride salt and a diol compound in which one or two ether bonds are disposed between two OH groups, the present invention achieves the aforementioned object.