Lithium Battery Electrolyte Additive for Heat-Resistant Electrode Films
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Solution Overview
Problem
Lithium secondary batteries face issues with reduced lifespan and high-temperature stability due to side reactions and gas generation caused by the decomposition of organic solvents, leading to increased internal resistance and instability of the electrolyte.
Innovation Solution
Incorporating a compound represented by Formula 1 as an electrolyte additive, which forms a heat-resistant film on the electrodes, suppressing gas generation and enhancing ion conductivity, thereby improving the battery's high-temperature stability and cycle lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an organic electrolyte is used in a lithium secondary battery, then the battery can operate at high driving voltage, but side reactions occur between the electrodes and the organic electrolyte leading to decreased lifespan and high-temperature stability
Solution Approach 1:
A compound of Formula 1 is introduced as an intermediary substance in the electrolyte that mediates between the electrodes and the organic electrolyte. This compound forms a protective film on the electrode surfaces, preventing direct contact and side reactions between the electrodes and the organic electrolyte, thereby improving lifespan and high-temperature stability while maintaining high driving voltage operation
Solution Approach 2:
The chemical composition parameters of the electrolyte are changed by incorporating a specific compound of Formula 1 with particular functional groups (carboxylic acid, sulfonic acid, phosphoric acid, or their salts). This parameter change modifies the electrolyte's interaction characteristics with the electrodes, reducing side reactions and improving reliability without sacrificing voltage performance
2Quantity of substance
If an organic solvent is used as electrolyte, then the electrolyte can provide high ionic conductivity and high dielectric constant, but the organic solvent decomposes at high temperature causing gas generation and increased internal resistance
Solution Approach 1:
The compound of Formula 1 performs preliminary action by forming a protective film on the electrode surfaces before the organic solvent can decompose. This pre-formed film acts as a barrier that prevents the organic solvent from decomposing at high temperatures, thereby preventing gas generation and internal resistance increase while maintaining the solvent's ionic conductivity and dielectric constant properties
Solution Approach 2:
The compound of Formula 1 converts the potential harm of organic solvent decomposition into a benefit by forming a stable protective film. The decomposition-prone organic solvent is now constrained to function beneficially within the protected interface, maintaining its electrical properties without exhibiting its harmful decomposition behavior 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 use of the compound in the electrolyte reduces internal resistance, prevents gas generation, and enhances the battery's high-temperature stability and cycle lifespan, resulting in improved performance and reduced defects.
Implementation Method 1
Incorporating a compound represented by Formula 1 as an electrolyte additive, which forms a heat-resistant film on the electrodes
Implementation Method 2
An organic electrolyte is prepared by dissolving a lithium salt in an organic solvent... may have a high ionic conductivity
Data Source
AI summary
An electrolyte for a lithium secondary battery and a lithium secondary battery including the electrolyte are disclosed. The electrolyte may include a lithium salt, an organic solvent, and a compound represented by Formula 1:where, in Formula 1, A is oxygen or sulfur.