Fluorinated Cyclic Carbonate Additive for Lithium Battery Electrolyte
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Solution Overview
Problem
Conventional rechargeable lithium batteries face challenges in maintaining stability and performance due to the limitations of existing electrolytes, particularly in terms of flame retardancy and cycle-life characteristics.
Innovation Solution
An electrolyte additive represented by specific chemical formulas is introduced, which improves flame retardancy and stability by forming a stable passivation film on the electrodes, enhancing the cycle-life characteristics of the battery. The additive is included in the electrolyte in specific weight or volume percentages, along with a lithium salt and non-aqueous organic solvents, to optimize battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used, then the battery can operate, but flame retardancy is insufficient and stability is compromised
Solution Approach 1:
The patent introduces a fluorinated cyclic carbonate compound as an intermediary additive in the electrolyte. This compound acts as a mediator that reacts with electrode surfaces to form stable passivation films, thereby improving both stability and flame retardancy without compromising battery operation
Solution Approach 2:
The electrolyte is formulated as a composite system containing multiple components: cyclic carbonate, chain carbonate, and fluorinated cyclic carbonate compound. This composite electrolyte composition synergistically combines the benefits of each component to achieve both operational stability and enhanced flame retardancy
2Reliability
If electrolyte additives are added to improve performance, then flame retardancy and stability improve, but the electrolyte composition becomes more complex
Solution Approach 1:
The fluorinated cyclic carbonate compound is specifically designed to act locally at the electrode-electrolyte interface. It concentrates at the electrode surface to form passivation films, providing localized protection and stability enhancement without requiring complex bulk electrolyte modifications
Solution Approach 2:
The patent optimizes the concentration parameter of the fluorinated cyclic carbonate compound within a specific range (0.01-50 wt%, preferably 0.1-30 wt%). By controlling this parameter, the electrolyte achieves improved cycle-life characteristics while maintaining manageable composition complexity
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 additive significantly enhances flame retardancy and cycle-life characteristics of the rechargeable lithium battery by forming a stable passivation film on the electrodes, leading to improved battery performance and stability.
Implementation Method 1
The electrolyte additive may be used to form a stable passivation film on the surface of an electrode
Implementation Method 2
A conventional electrolyte includes an organic solvent in which a lithium salt is dissolved
Implementation Method 3
Batteries transform chemical energy generated from an electrochemical redox reaction of a chemical material in the battery into electrical energy
Data Source
AI summary
An electrolyte additive represented by the following Chemical Formula 1, an electrolyte, and a rechargeable lithium battery are disclosed:In Chemical Formula 1, R1 to R3 and L1 to L3 are the same as defined in the detailed description.