Fluorinated Electrolyte Composition for Lean Chalcogen Batteries
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Solution Overview
Problem
There is a lack of electrolyte compositions for lithium-chalcogen batteries that operate effectively under lean electrolyte conditions, specifically with an electrolyte to sulfur (E/S) ratio of ≤10, which is essential for improving battery performance.
Innovation Solution
A battery design incorporating an anode, a cathode with a carbon-chalcogen composite, and an electrolyte composition that includes greater than 30 vol % fluorinated carbonate or a combination of fluorinated carbonate and a different fluorinated compound, along with a plurality of salts, to facilitate efficient ion transfer and charge/discharge processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrolyte compositions are used in lithium-chalcogen batteries, then adequate performance can be achieved, but rich electrolyte conditions (E/S ratios > 10) are required
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing fluorinated carbonates (greater than 30 vol %) and fluorinated compounds (at least 20 vol %). This parameter change enables the electrolyte to function effectively at lean conditions (E/S ratios ≤ 10), resolving the contradiction between maintaining battery performance and reducing electrolyte quantity.
2Reliability
If lean electrolyte conditions (E/S ratios ≤ 10) are employed, then battery performance can be improved, but adequate ion mobility and charge storage capacity are difficult to maintain
Solution Approach 1:
The patent modifies the electrolyte's physical and chemical parameters through the use of fluorinated carbonates and fluorinated compounds. These parameter changes optimize the electrolyte's properties to maintain adequate ion mobility and charge storage capacity even under lean electrolyte conditions, thus resolving the contradiction between improved battery performance and maintained ion mobility.
Solution Approach 2:
The electrolyte composition creates a composite system by combining fluorinated carbonate, fluorinated compound, and salt in specific proportions. This composite material approach enables the electrolyte to simultaneously achieve lean conditions compatibility and adequate ion mobility, resolving the contradiction between battery performance improvement and ion mobility maintenance.
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 proposed solution enhances battery performance by maintaining adequate ion mobility and charge storage capacity even at lean electrolyte conditions, achieving an activation energy of at least 95 KJ/mol and supporting multiple charge cycles with improved capacity retention.
Implementation Method 1
an electrolyte composition in fluid communication with the anode and the cathode, the electrolyte composition including a fluorinated solvent including: greater than 30 vol % fluorinated carbonate... to facilitate efficient ion transfer and charge/discharge processes
Data Source
AI summary
A battery includes: an anode; a cathode including chalcogen separated from the anode; and an electrolyte composition in fluid communication with the anode and the cathode, the electrolyte composition including a fluorinated solvent including: greater than 30 vol % fluorinated carbonate, used with the cathode including a carbon-chalcogen composite having at least 50 wt % chalcogen based on solids weight of the carbon-chalcogen composite; and/or at least 20 vol % fluorinated carbonate and a fluorinated compound different from the fluorinated carbonate, the vol % based on total volume of the electrolyte composition excluding salts.