Lithium Battery Electrolyte Composition for High-Temperature Stability
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Solution Overview
Problem
Existing rechargeable lithium batteries face degradation in lifespan characteristics and stability due to side reactions caused by F- ions, particularly at high temperatures, when using lithium salts like LiPF6 and fluorophosphite-based additives.
Innovation Solution
Incorporating a specific electrolyte composition comprising a lithium salt, a non-aqueous organic solvent, a first additive represented by Chemical Formula 1, and a second additive represented by Chemical Formula 2, which effectively suppresses side reactions and enhances stability and lifespan characteristics at both room and high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If lithium salt like LiPF6 and fluorophosphite-based additives are used in the electrolyte, then the battery can operate at high temperatures, but side reactions occur causing degradation in lifespan characteristics and stability
Solution Approach 1:
The patent removes fluorophosphite-based additives from the electrolyte composition, extracting the harmful component that causes side reactions at high temperatures. This elimination of the problematic substance resolves the contradiction by allowing high temperature operation without the associated degradation issues.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrolyte by substituting fluorophosphite-based additives with alternative substances having different chemical properties. This parameter change modifies the electrolyte's reaction characteristics, enabling stable operation at high temperatures without sacrificing lifespan characteristics.
2Productivity
If conventional electrolyte composition is used, then the battery shows initial performance, but performance degrades over time particularly at high temperatures
Solution Approach 1:
The patent employs a composite electrolyte formulation combining lithium salt with specifically selected additives that work synergistically. This composite material approach maintains initial performance characteristics while providing long-term stability, resolving the contradiction between initial productivity and duration of action.
Solution Approach 2:
The patent replaces unstable, short-lived chemical components (fluorophosphite-based additives that decompose at high temperatures) with more stable alternatives. This substitution uses materials that maintain their functional properties over extended periods, thereby extending the battery's operational lifespan without sacrificing initial performance.
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 composition improves the stability and lifespan of rechargeable lithium batteries by reducing side reactions, maintaining performance across varying temperature ranges.
Implementation Method 1
A lithium salt dissolved in a non-aqueous organic solvent may be used as the electrolyte of the rechargeable lithium battery
Implementation Method 2
generate electrical energy caused by oxidation and reduction reactions if (e.g., when) lithium ions are intercalated and deintercalated
Data Source
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AI summary
Disclosed are electrolytes and rechargeable lithium batteries. The electrolyte for a rechargeable lithium battery includes a lithium salt, a non-aqueous organic solvent, a first additive represented by Chemical Formula 1, and a second additive represented by Chemical Formula 2.