Sulfonate-Substituted Cyclic Ester Electrolyte for Battery Stability
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Solution Overview
Problem
Lithium secondary batteries face challenges in maintaining stability and capacity retention due to increased interior resistance at high temperatures and gas generation during decomposition, particularly when using conventional electrolytes in high-capacity applications.
Innovation Solution
An electrolyte comprising a cyclic ester compound substituted with a sulfonate group and an organic solvent, which forms a thin film on the anode surface, suppressing interior resistance and gas generation, and includes a lithium salt for improved ion conductivity and solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional electrolytes are used in high-capacity lithium secondary batteries, then capacity is improved, but interior resistance increases at high temperatures and stability deteriorates
Solution Approach 1:
The patent introduces a cyclic ester compound with a sulfonate group as an electrolyte additive, changing the chemical composition parameters of the electrolyte system. This additive modifies the properties of the solid electrolyte interface film formed on the anode, improving both capacity retention and high-temperature stability without sacrificing battery capacity.
Solution Approach 2:
The electrolyte is formulated as a composite system containing the cyclic ester compound with sulfonate group combined with conventional electrolyte components. This composite approach allows the sulfonate-containing compound to form a stable protective film while maintaining the high capacity characteristics of conventional electrolytes.
2Quantity of substance
If conventional electrolytes are used to achieve high capacity, then battery capacity is improved, but gas generation increases during decomposition
Solution Approach 1:
The cyclic ester compound with sulfonate group changes the decomposition characteristics of the electrolyte system. The sulfonate functional group promotes the formation of a stable solid electrolyte interface film that prevents further decomposition reactions, thereby reducing gas generation while maintaining high capacity performance.
Solution Approach 2:
The patent converts the potential harmful decomposition reactions that produce gas into a beneficial process by using the cyclic ester compound with sulfonate group to form a stable protective film. This film prevents harmful decomposition while the initial film formation process is controlled and minimized.
3Quantity of substance
If high-capacity battery materials are used, then battery capacity is improved, but interior resistance increases at high temperatures
Solution Approach 1:
The addition of cyclic ester compound with sulfonate group changes the electrical resistance characteristics of the electrolyte system. The sulfonate-containing additive modifies the solid electrolyte interface properties, reducing interior resistance and improving ionic conductivity at high temperatures while maintaining high capacity.
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 electrolyte enhances the stability and lifespan of lithium secondary batteries by reducing interior resistance and gas generation, maintaining capacity retention and improving high-temperature characteristics.
Implementation Method 1
forms a thin film on the anode surface
Implementation Method 2
forms a thin film on the anode surface
Implementation Method 3
includes a lithium salt for improved ion conductivity
Implementation Method 4
includes a lithium salt for improved ion conductivity and solubility
Data Source
AI summary
An electrolyte includes an organic solvent and a cyclic ester compound that is substituted with a sulfonate group.