Battery Electrolyte Additives for High-Temperature Electrode Stability
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in maintaining high-temperature lifetime characteristics, with existing electrolytes not adequately addressing issues of electrode stability and resistance increase at elevated temperatures.
Innovation Solution
The use of an electrolyte comprising a non-aqueous organic solvent, a lithium salt, and specific additives such as Compound 1 and Compound 2, which form a stable film on the electrode surface, improving cycle characteristics and reducing electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional electrolytes are used in rechargeable lithium batteries, then the battery can operate at high temperature, but the electrode stability deteriorates and electrical resistance increases
Solution Approach 1:
The patent introduces a fluorinated cyclic carbonate compound as an intermediary substance that mediates between the electrode and the conventional electrolyte. This compound forms a protective interfacial layer that stabilizes the electrode at high temperatures while maintaining ionic conductivity, thus resolving the contradiction between high-temperature operation and electrode stability
Solution Approach 2:
The patent modifies the electrolyte composition by adding a fluorinated cyclic carbonate compound with specific molecular structure parameters (fluorine substitution, cyclic carbonate group). This parameter change in the electrolyte composition enables the formation of a stable solid electrolyte interface (SEI) layer that prevents electrode degradation at high temperatures
2Temperature
If conventional electrolytes are used in rechargeable lithium batteries, then the battery can operate at high temperature, but electrical resistance increases
Solution Approach 1:
The fluorinated cyclic carbonate compound acts as an intermediary that forms a low-resistance interfacial layer between the electrode and electrolyte. This intermediate layer facilitates lithium ion transport while blocking harmful reactions, thus maintaining low electrical resistance during high-temperature operation
Solution Approach 2:
The patent creates a composite electrolyte system combining conventional carbonate solvents with fluorinated cyclic carbonate additive. This composite electrolyte formulation produces a composite interface structure that combines the high ionic conductivity of conventional electrolytes with the thermal stability and low resistance characteristics of the fluorinated compound
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 proposed electrolyte solution enhances the high-temperature lifetime characteristics of rechargeable lithium batteries by stabilizing the electrodes and suppressing resistance increases, thereby improving battery performance and longevity.
Implementation Method 1
specific additives such as Compound 1 and Compound 2, which form a stable film on the electrode surface
Data Source
AI summary
Disclosed are electrolytes and rechargeable lithium batteries including the same. The electrolyte includes a non-aqueous organic solvent, a lithium salt, and an additive. The additive includes Compound 1 represented by Chemical Formula 1 and Compound 2 represented by Chemical Formula 2.