Lithium Battery Electrolyte Additives for High-Temperature Stability
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in maintaining high energy density and capacity while ensuring stability and longevity, particularly at high temperatures.
Innovation Solution
An electrolyte solution comprising a non-aqueous organic solvent, a lithium salt, a first additive represented by Chemical Formula 1, and a second additive represented by Chemical Formula 2, which includes specific functional groups to stabilize the electrolyte and reduce gas generation and resistance, enhancing the battery's high-temperature performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional electrolyte solutions are used to achieve high energy density and capacity, then battery performance is improved, but stability and lifetime characteristics deteriorate at high temperatures
Solution Approach 1:
The patent modifies the chemical composition parameters of the electrolyte by introducing specific additives (cyclic carbonate and chain carbonate in defined ratios) to change the physical and chemical properties of the electrolyte solution, thereby improving high-temperature stability while maintaining energy density
Solution Approach 2:
The patent creates a composite electrolyte system by combining multiple components (cyclic carbonate, chain carbonate, lithium salt, and specific additives) in defined proportions, where the synergistic interaction between components achieves both high energy density and improved thermal stability
2Use of energy by moving object
If conventional electrolyte solutions are used to achieve high capacity, then battery performance is improved, but gas generation increases leading to reduced lifetime characteristics
Solution Approach 1:
The patent converts the potentially harmful gas generation side effect into a beneficial outcome by using specific additives that control the decomposition reactions, transforming the harmful gas evolution into controlled reactions that form protective films on electrodes, thereby reducing overall gas generation while maintaining high capacity
Solution Approach 2:
The patent introduces cyclic carbonate and chain carbonate as intermediary substances that mediate between the lithium salt and electrode surfaces, controlling the electrochemical reactions to prevent excessive gas generation while maintaining high capacity through facilitated ion transport
3Ease of operation
If conventional electrolyte solutions are used, then battery operation is achieved, but internal resistance increases at high temperatures reducing performance
Solution Approach 1:
The patent changes the viscosity and conductivity parameters of the electrolyte by optimizing the ratio of cyclic to chain carbonate and selecting appropriate lithium salts, thereby maintaining low internal resistance and stable operation at high temperatures
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 solution improves the battery's lifetime characteristics and stability at high temperatures by reducing gas generation and internal resistance, thereby maximizing capacity and performance.
Implementation Method 1
a lithium salt is dissolved in a non-aqueous organic solvent
Implementation Method 2
a lithium salt is dissolved in a non-aqueous organic solvent
Implementation Method 3
The rechargeable lithium battery exhibits its characteristics by complex reactions between the positive electrode and the electrolyte and between the negative electrode and the electrolyte
Implementation Method 4
generates electrical energy by oxidation and reduction reactions when the lithium ions are intercalated/deintercalated
Implementation Method 5
generates electrical energy by oxidation and reduction reactions when the lithium ions are intercalated/deintercalated
Implementation Method 6
the positive electrode and the negative electrode each include an active material capable of intercalating and deintercalating lithium ions
Data Source
AI summary
The present disclosure relates to an electrolyte solution for a rechargeable lithium battery and a rechargeable lithium battery including the same, wherein the electrolyte solution includes a non-aqueous organic solvent, a lithium salt, the above-described first additive represented by Chemical Formula 1, and the above-described second additive represented by Chemical Formula 2.