Non-Aqueous Electrolyte Composition for Fast-Charging Lithium Batteries
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Solution Overview
Problem
Lithium secondary batteries have insufficient rapid charging performance and experience degradation when rapid charging is repeated, limiting their application in high-demand devices like electric vehicles.
Innovation Solution
A non-aqueous electrolyte solution comprising cyclic carbonate, dimethyl carbonate, alkyl formate, a lithium salt, and a specific oligomer surfactant is used, which improves ionic conductivity and reduces surface resistance, enabling better rapid charging performance and initial resistance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional electrolyte solutions are used, then basic battery function is maintained, but rapid charging performance is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing a specific oligomer surfactant with fluorinated alkylene groups and ester groups into the conventional electrolyte system. This compositional parameter change enables faster lithium ion transport kinetics (improving rapid charging performance) while the fluorinated structure provides stability that prevents performance degradation during repeated charging cycles.
Solution Approach 2:
The patent creates a composite electrolyte system by combining the oligomer surfactant with conventional electrolyte components (cyclic carbonate, chain carbonate, and lithium salt). This composite approach allows the surfactant to form protective interfaces and enhance ion conductivity without compromising the overall stability and reliability of the battery system.
2Loss of time
If rapid charging is implemented, then charging time is reduced, but battery performance degrades when rapid charging is repeated
Solution Approach 1:
The oligomer surfactant acts as a preventive protective agent that forms stable interfacial films on electrode surfaces before degradation can occur. The fluorinated alkylene groups and ester groups in the surfactant structure create a protective cushion that prevents harmful reactions during rapid charging, thereby maintaining battery performance even after repeated rapid charging cycles.
3Ease of manufacture
If conventional electrolyte composition is used, then manufacturing simplicity is maintained, but initial resistance characteristics are poor
Solution Approach 1:
The patent modifies the electrolyte composition by adding a specific oligomer surfactant with controlled molecular structure (Formula 1) to the conventional electrolyte mixture. This parameter change improves initial resistance characteristics by enhancing interfacial contact and ion transport, while the manufacturing process remains relatively simple as it only requires mixing the surfactant with existing electrolyte components.
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 achieves excellent rapid charging performance and low initial resistance in lithium secondary batteries, enhancing their durability and efficiency for high-power applications.
Implementation Method 1
improves ionic conductivity and reduces surface resistance, enabling better rapid charging performance
Implementation Method 2
an oligomer having a specific structure as a surfactant
Data Source
AI summary
A non-aqueous electrolyte solution and a lithium secondary battery including the same are disclosed herein. In some embodiments, a non-aqueous electrolyte solution includes an organic solvent, a lithium salt, and an oligomer represented by Formula 1 as a surfactant, wherein the organic solvent contains containing cyclic carbonate, dimethyl carbonate, and alkyl formate.