Sulfonyl Electrolyte for High-Voltage Lithium Battery Fast Charging
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Solution Overview
Problem
Existing electrolytic solutions for lithium secondary batteries suffer from reduced performance at high voltages, leading to rapid internal resistance increase and shortened lifespan, limiting their use in applications requiring high energy density and stable power supply.
Innovation Solution
An electrolytic solution containing a sulfonyl compound with a specific structure, along with additives like sultone and fluorine-substituted carbonate compounds, enhances the battery's high-rate charge and discharge characteristics, lifespan, and high-temperature stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the operating voltage range is widened for high energy density, then energy density increases, but internal resistance and lifespan are rapidly reduced
Solution Approach 1:
The sulfonyl compound acts as a sacrificial additive that forms protective films on electrode surfaces, consuming itself to prevent more significant degradation of the battery system. This enables the battery to achieve high energy density through widened voltage range while maintaining extended lifespan through the protective effect of the formed films
Solution Approach 2:
The patent combines the sulfonyl compound (Formula 1) with conventional electrolyte components including lithium salts and carbonate solvents. This composite electrolyte system synergistically achieves both high energy density through high voltage operation and extended lifespan through improved electrochemical stability
2Quantity of substance
If the operating voltage range is widened for high energy density, then energy density increases, but internal resistance rapidly increases
Solution Approach 1:
The introduction of the sulfonyl compound with specific structural parameters (C1-C10 alkyl, C2-C10 alkenyl, C6-C12 aryl groups) fundamentally changes the electrochemical properties of the electrolyte system. This enables the battery to operate at high voltages (4.2V and above) with low internal resistance, achieving high energy density without the harmful increase in resistance that plagues conventional systems
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 solution significantly improves quick charge characteristics, lifespan, and high-temperature storage stability of lithium secondary batteries, enabling them to operate effectively at high voltages and temperatures.
Implementation Method 1
a sulfonyl compound having a specific structure... capable of improving electrical properties of the secondary battery at a high voltage
Implementation Method 2
a non-aqueous solvent to have a high dielectric and high ion conductivity in a wide temperature range in order to dissolve the lithium salt
Implementation Method 3
a non-aqueous solvent-based electrolytic solution... high ion conductivity
Data Source
AI summary
The present disclosure relates to an electrolytic solution for a secondary battery and a lithium secondary battery employing the same. The electrolytic solution for a secondary battery of the present disclosure contains a sulfonyl compound, such that a lithium secondary battery employing a high content of nickel for a cathode has significantly improved quick charge characteristics, room temperature lifespan characteristics, and low-temperature characteristics.