Cyclic Sulfonamide Electrolyte for High Voltage Battery Stability
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Solution Overview
Problem
Conventional organic solvents used in lithium batteries are prone to decomposition at high voltages and elevated temperatures, leading to reduced cycle life and safety concerns.
Innovation Solution
Development of an organic electrolyte solvent with a compound of the formula R1—SO2—NR2—OR3 or R1O—SO2—NR3, where R1, R2, and R3 are selected from alkanes, alkenes, alkynes, aryls, and their substituted or perfluorinated derivatives, which remains stable at voltages greater than 4.0 volts, along with the inclusion of electrolyte salts and additives to enhance stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic solvents are used as electrolytes, then the battery can operate, but the electrolyte decomposes at high voltages and elevated temperatures leading to reduced cycle life and safety issues
Solution Approach 1:
The patent modifies the chemical structure of conventional carbonate electrolytes by introducing cyclic sulfonamide groups with specific R1, R2, and R3 substituents. This structural parameter change increases the decomposition voltage from typical conventional values to greater than 4.0 volts, directly improving electrolyte stability at high voltages and elevated temperatures while extending battery cycle life
Solution Approach 2:
The invention creates a composite electrolyte system by combining cyclic sulfonamide compounds with conventional carbonate solvents (EC, PC, DMF, DMSO) and lithium salts. This composite approach maintains the beneficial properties of conventional electrolytes while adding the high-voltage stability of cyclic sulfonamides, achieving both operational reliability and extended cycle life
Data Source
AI summary
An organic electrolyte solvent includes a compound of the formula: R1—SO2—NR2—OR3 wherein R1 is selected from alkanes, alkenes, alkynes, aryls and their substituted derivatives and perfluorinated analogues; R2 is selected from alkanes, alkenes, alkynes, aryls and their substituted derivatives; R3 is selected from alkanes, alkenes, alkynes, aryls and their substituted derivatives wherein the electrolyte solvent is stable at voltages of greater than 4.0 volts.