Silicon Sulfate Electrolyte for Halogen-Free Batteries
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Solution Overview
Problem
Existing power storage devices require electrolyte salts with high ion electrical conductivity and wide electric potential windows, but those containing halogen atoms pose environmental concerns and do not meet the demand for halogen-free options.
Innovation Solution
A silicon-containing sulfuric acid ester salt with a silicon atom-containing sulfate anion and specific monovalent cations, such as quaternary ammonium or phosphonium ions, is developed, which is halogen-free and suitable for use in power storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogen-containing electrolyte salts are used, then high ion electrical conductivity and wide electric potential windows are achieved, but environmental load increases
Solution Approach 1:
The invention changes the chemical composition parameters by replacing halogen atoms (particularly fluorine) in the anion structure with oxygen atoms, transforming from halogen-containing electrolyte salts to silicon-containing sulfuric acid ester salts. This parameter change maintains electrochemical stability while eliminating environmental harm associated with halogen disposal
Solution Approach 2:
The invention uses composite material design by combining silicon atoms with sulfate groups to create silicon-containing sulfate anions. This composite structure integrates the electrochemical stability characteristics of sulfate groups with the beneficial properties of silicon, achieving both high reliability and environmental compatibility
2Object-affected harmful factors
If halogen-free electrolyte salts are used, then environmental load is reduced, but electric potential window and electrochemical stability are insufficient
Solution Approach 1:
The invention optimizes molecular structure parameters by introducing silicon atoms into the sulfate anion structure and adjusting the alkyl group configurations. These parameter changes enhance the electrochemical stability and widen the electric potential window while maintaining the halogen-free, environmentally friendly characteristic
Data Source
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AI summary
Provided is a silicon-containing sulfuric acid ester salt comprising a silicon-containing sulfuric acid ester anion represented by formula (1) and a cation selected from cations respectively represented by formulae (2) to (5).