Lithium Battery Electrolyte Additive for High-Temperature Fast Charging
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Solution Overview
Problem
Rechargeable lithium batteries face performance degradation at elevated temperatures, particularly during rapid charging, due to issues with electrolyte stability and gas generation.
Innovation Solution
Incorporation of a specific additive, represented by Formula 1, which includes a nitrogen-containing oxalic acid derivative, sulfonyl, and terminal alkenyl moieties, into the electrolyte to enhance the stability and conductivity of the solid electrolyte interface (SEI) on the negative electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used in rechargeable lithium batteries, then the batteries can operate at normal temperatures, but the performance degrades at elevated temperatures due to electrolyte instability and gas generation
Solution Approach 1:
The patent introduces a specific additive compound as an intermediary substance in the electrolyte that mediates the interaction between the electrolyte and electrode at high temperatures. This additive acts as a buffer that prevents direct harmful reactions, stabilizes the interface, and suppresses gas generation, thereby improving battery reliability at elevated temperatures without compromising electrolyte stability
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte by incorporating a specifically structured additive compound. This changes the physical and chemical parameters of the electrolyte system, including its stability characteristics and reaction behavior at high temperatures, enabling the battery to maintain performance under thermal stress
2Productivity
If conventional electrolytes are used during rapid charging, then charging speed can be maintained, but gas generation increases and performance degrades at elevated temperatures
Solution Approach 1:
The patent converts the potentially harmful effect of high-temperature operation during rapid charging into a beneficial outcome. The additive compound is designed to specifically activate or become more effective at elevated temperatures, transforming the harmful thermal conditions into an opportunity to stabilize the electrolyte interface and suppress gas generation, thereby enabling fast charging without the usual penalty of excessive gas evolution
3Reliability
If the electrolyte is stabilized to prevent degradation, then battery reliability improves, but conductivity may be reduced affecting charging performance
Solution Approach 1:
The patent applies local quality by having the additive compound concentrate its stabilizing effect specifically at the electrolyte-electrode interface where degradation occurs, rather than uniformly throughout the entire electrolyte bulk. This localized action maintains high conductivity in the bulk electrolyte while providing stability exactly where needed at the interface, thus resolving the contradiction between stability and conductivity
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 additive significantly reduces gas generation and improves battery performance at high temperatures and during rapid charging by stabilizing the SEI, thereby enhancing the overall performance of rechargeable lithium batteries.
Implementation Method 1
the additive significantly reduces gas generation and improves battery performance at high temperatures and during rapid charging by stabilizing the SEI
Data Source
AI summary
A compound, an electrolyte including the compound, and a rechargeable lithium battery including the electrolyte are provided. The electrolyte may include a non-aqueous organic solvent, a lithium salt, and an additive, and the additive may include the compound that is represented by Formula 1.