Rechargeable Lithium Battery Electrolyte for High-Temperature Stability
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in achieving high-temperature lifetime and stability, particularly with high-capacity and high-density batteries due to side reactions and gas generation at elevated temperatures.
Innovation Solution
An electrolyte composition for lithium batteries comprising a non-aqueous organic solvent, lithium salt, and specific additives (Chemical Formulas 1 and 2) that form a stable solid electrolyte interface (SEI) layer, reducing gas generation and internal resistance, and enhancing ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional electrolytes are used in high-capacity and high-density batteries, then battery capacity and energy density are improved, but side reactions and gas generation increase at elevated temperatures
Solution Approach 1:
The patent introduces a mediating substance (specific additive compound with formula (1)) that acts as an intermediary between the conventional electrolyte and the high-capacity battery system. This additive forms a protective interface layer that mediates the interaction between electrolyte and electrode, preventing direct harmful reactions while maintaining ionic conductivity, thus resolving the contradiction between high capacity and reduced side reactions at elevated temperatures
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte by incorporating a specific additive compound with formula (1) at controlled concentrations (0.1-5 wt%). This parameter change alters the electrochemical properties of the electrolyte system, enabling it to maintain stability and reduce gas generation at high temperatures while preserving high battery capacity and energy density
2Reliability
If high-temperature performance is improved through electrolyte modification, then stability and lifetime are enhanced, but internal resistance increases
Solution Approach 1:
The patent optimizes the concentration parameter of the additive compound (formula (1)) within a specific range (0.1-5 wt%) to achieve the desired balance. By precisely controlling this compositional parameter, the electrolyte forms an optimal protective layer that enhances high-temperature stability and lifetime without creating excessive internal resistance, thus resolving the contradiction between reliability and harmful factors
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 improves high-temperature stability and lifetime of lithium batteries by minimizing side reactions and maintaining conductivity, especially when combined with high-nickel-based positive electrodes and silicon particles, thus optimizing battery performance.
Implementation Method 1
specific additives (Chemical Formulas 1 and 2) that form a stable solid electrolyte interface (SEI) layer
Implementation Method 2
enhancing ion conductivity
Data Source
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AI summary
An electrolyte for a rechargeable lithium battery and a rechargeable lithium battery including the same are provided. The electrolyte includes a non-aqueous organic solvent, a lithium salt, and an additive. The additive includes a first compound represented by Chemical Formula 1 and a second compound represented by Chemical Formula 2.