Lithium Battery Electrolyte Oligomer Suppresses Gas Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium secondary batteries face challenges with high-temperature durability due to gas generation and exothermic reactions during storage and overcharge, which affect internal pressure and electrode stability.
Innovation Solution
An electrolyte comprising a lithium salt, an organic solvent, and an oligomer with specific structural features, such as Formula 1, is used to suppress oxidation reactions and improve wettability, forming a stable ion conductive film on the electrode surface, thereby enhancing high-temperature durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used in lithium secondary batteries, then the batteries can operate and provide energy storage, but gas generation and exothermic reactions occur during high-temperature storage and overcharge, reducing stability and durability
Solution Approach 1:
The patent introduces a specific oligomer compound as an intermediary substance in the electrolyte formulation. This oligomer acts as a mediator that suppresses oxidation reactions and gas generation during high-temperature storage and overcharge conditions, thereby improving battery reliability without compromising electrochemical performance
Solution Approach 2:
The patent modifies the electrolyte composition by incorporating an oligomer with specific molecular structure parameters (Formula 1 with defined R groups, a values of 1-3, and n values of 1-75). This parameter change in the chemical composition suppresses harmful oxidation reactions and gas generation while maintaining ion conductivity
2Reliability
If conventional electrolytes are used in lithium secondary batteries, then the batteries can operate and provide energy storage, but oxidation reactions occur during high-temperature storage and overcharge, reducing stability and durability
Solution Approach 1:
The oligomer compound serves as a protective intermediary that suppresses oxidation reactions between the electrolyte and electrode materials during high-temperature storage and overcharge, thereby improving both reliability and compositional stability
Solution Approach 2:
The patent creates a composite electrolyte system by combining the oligomer (Formula 1) with lithium salts and organic solvents. This composite material approach enhances the overall stability and oxidation resistance of the electrolyte while maintaining its electrochemical functionality
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 significantly reduces gas generation and exothermic reactions, improving the stability and performance of lithium secondary batteries by maintaining ion conductivity and preventing side reactions during high-temperature storage and overcharge.
Implementation Method 1
there is provided an electrolyte for a lithium secondary battery in which high-temperature durability is improved by suppressing an oxidation reaction during high-temperature storage and overcharge
Implementation Method 2
forming a stable ion conductive film on the electrode surface
Implementation Method 3
Gas may be generated in the secondary battery due to the decomposition of the electrolyte during charge and discharge of the lithium secondary battery or a side reaction between the electrode and the electrolyte
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to an electrolyte for a lithium secondary battery and a lithium secondary battery including the same, and particularly, to an electrolyte for a lithium secondary battery, which includes a lithium salt, an organic solvent, and an oligomer represented by Formula 1 described in the present specification, and a lithium secondary battery in which overall performance is improved by suppressing reactivity with lithium metal by including the electrolyte.