Fluorinated Carbonate Electrolyte for High Voltage Battery Stability
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Solution Overview
Problem
Lithium ion secondary batteries require improved electrolyte solutions to handle increased voltage and enhance high-temperature storage and cycle characteristics, particularly for applications in vehicles.
Innovation Solution
An electrolyte solution containing a solvent with fluorinated saturated cyclic carbonate and acyclic carbonate, along with a specific sulfur-containing compound, is used to improve the voltage handling and thermal stability of electrochemical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolyte solutions are used, then basic battery function is maintained, but high-temperature storage characteristics and cycle characteristics deteriorate
Solution Approach 1:
The patent modifies the chemical composition parameters of the electrolyte by introducing fluorinated cyclic carbonate and fluorinated chain carbonate with specific fluorine content ratios (30-70 mass%). This parameter change in the solvent composition enables the electrolyte to maintain stability at high temperatures while improving high-temperature storage characteristics and cycle life of the battery.
Solution Approach 2:
The patent creates a composite electrolyte system by combining fluorinated cyclic carbonate and fluorinated chain carbonate in specific proportions, along with lithium salt and additive. This composite material approach allows the electrolyte to simultaneously achieve high voltage compatibility, high-temperature stability, and improved cycle characteristics that single-component electrolytes cannot provide.
2Power
If conventional electrolyte solutions are used, then basic battery function is maintained, but voltage handling capability is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the electrolyte by incorporating fluorinated compounds with specific fluorine content (30-70 mass%). The fluorine atoms increase the electrochemical stability window and dielectric constant of the electrolyte, enabling it to handle higher voltages while maintaining stability and preventing decomposition at elevated potentials.
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 effectively addresses the need for higher voltage and improved high-temperature storage and cycle characteristics, making it suitable for onboard applications by forming a stable film on electrodes and suppressing side reactions.
Implementation Method 1
forming a stable film on electrodes and suppressing side reactions
Implementation Method 2
cycle characteristics
Data Source
AI summary
The present invention provides an electrolyte solution that is capable of dealing with an increased voltage of an electrochemical device, as well as capable of improving the high-temperature storage characteristics and cycle characteristics of the electrochemical device, and an electrochemical device. The electrolyte solution includes a solvent containing a fluorinated saturated cyclic carbonate and a fluorinated acyclic carbonate; at least one sulfur-containing compound selected from the group consisting of compounds having a —SO2— bond, compounds having a —SO3— bond, and compounds having a —SO4— bond, and an electrolyte salt. The fluorinated acyclic carbonate has a fluorine content of 31.0 to 70.0 mass %.