Optimized Electrolytic Solution for High-Capacity Lithium Batteries
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Summary
Problems
Lithium ion secondary batteries often face challenges in achieving long life and high capacity, as increasing the density or weight per area of electrodes does not always efficiently enhance battery capacity.
Innovation solutions
An electrolytic solution containing a specific lithium salt, a linear carbonate, and an unsaturated cyclic carbonate at specific concentrations and mole ratios, which forms a suitable SEI coating on electrodes, improving lithium ion transportation and battery characteristics.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the density or weight per area of the electrode is increased to provide high capacity, then the battery capacity may be increased, but the capacity is not efficiently increased in some cases
Why choose this principle:
The patent changes the chemical composition parameters of the electrolytic solution by introducing a specific cyclic carboxylate component and adjusting the concentration ratios of lithium salt to cyclic carbonate to approximately 1:4 to 1:6 (molar ratio). This parameter optimization enables efficient capacity utilization without merely increasing electrode density, thereby resolving the contradiction between quantity and productivity.
Principle concept:
If conventional electrolytic solution composition is used (cyclic carbonate 30 vol%, lithium salt 1 mol/L), then the battery operates normally, but long life and high capacity are not achieved
Why choose this principle:
The patent creates a composite electrolytic solution system by combining conventional cyclic carbonates (ethylene carbonate, propylene carbonate) with a specific cyclic carboxylate component (such as vinylene carbonate or fluoroethylene carbonate). This composite approach achieves both extended battery life through stable SEI formation and enhanced capacity through optimized ionic conductivity, simultaneously improving reliability and quantity.
Application Domain
Data Source
AI summary:
An electrolytic solution containing a specific lithium salt, a linear carbonate, and an unsaturated cyclic carbonate at specific concentrations and mole ratios, which forms a suitable SEI coating on electrodes, improving lithium ion transportation and battery characteristics.
Abstract
An electrolytic solution contains: an electrolyte including a lithium salt represented by general formula (1) below; an organic solvent including a linear carbonate represented by general formula (2) below; and an unsaturated cyclic carbonate, wherein the linear carbonate is contained at a mole ratio of 3 to 6 relative to the lithium salt, and/or the lithium salt is contained at a concentration of 1.1 to 3.8 mol/L. (R 1 X 1 )(R 2 SO 2 ) NLi general formula (1) R 20 OCOOR 21 general formula (2)