Lithium Battery Electrolyte for Rapid Charging and High-Temperature Stability
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Solution Overview
Problem
Lithium secondary batteries face challenges in achieving rapid charging performance while maintaining high-temperature capacity and output performance, as conventional fast charging methods often result in reduced battery capacity and life, and low energy density, making industrial application difficult.
Innovation Solution
An electrolyte for lithium secondary batteries comprising a lithium salt with a molar concentration of 1.5 M to 2.0 M, an oligomer with an acrylate group, and a first additive, which improves lithium ion yield and dissociation, and includes an organic solvent to enhance ionic conductivity and reduce side reactions, thereby improving high-temperature performance and rapid charging capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fast charging methods are used to shorten charging time, then rapid charging performance is improved, but capacity and life characteristics are reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by incorporating a specific oligomer containing fluorinated groups and acrylate end groups, along with a first additive having specific molecular structure. This composition modification enables the electrolyte to form stable interfacial films that facilitate rapid ion transport while protecting electrode materials from degradation, thus achieving fast charging without sacrificing capacity and cycle life
Solution Approach 2:
The patent creates a composite electrolyte system by combining the oligomer (with fluorinated backbone and acrylate end groups), the first additive (with specific R1-R4 substituents), and conventional electrolyte components. This composite approach synergistically combines the film-forming capability of the oligomer with the electrochemical stability of the additive, enabling both rapid charging performance and long-term battery health
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 proposed electrolyte solution enhances rapid charging performance while maintaining excellent high-temperature capacity retention and output performance, minimizing interfacial resistance and preventing decomposition reactions, thus improving the overall efficiency and stability of lithium secondary batteries.
Implementation Method 1
a lithium salt having a molar concentration of 1.5 M to 2.0 M
Implementation Method 2
an oligomer containing a unit represented by Formula 1 and having an acrylate group at an end thereof; a first additive represented by Formula 2
Implementation Method 3
materials capable of intercalating and deintercalating lithium ions as a negative electrode and a positive electrode
Implementation Method 4
materials capable of intercalating and deintercalating lithium ions as a negative electrode and a positive electrode
Implementation Method 5
electricity is generated or consumed by oxidation and reduction reactions caused by the intercalation and deintercalation of the lithium ions
Implementation Method 6
electricity is generated or consumed by oxidation and reduction reactions caused by the intercalation and deintercalation of the lithium ions
Data Source
AI summary
The present invention relates to an electrolyte for a lithium secondary battery, which includes a lithium salt having a molar concentration of 1.5 M to 2.0 M, an oligomer containing a unit represented by Formula 1 and having an acrylate group at an end thereof, a first additive represented by Formula 2, and an organic solvent, and a lithium secondary battery including the same.