Fluorocarbonate Electrolyte for High-Temperature Lithium Battery Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium batteries face challenges in maintaining stability and performance, particularly at high temperatures, due to issues with ion conductivity and resistance, which affect their capacity retention and output characteristics.
Innovation Solution
An electrolyte for lithium batteries is developed, comprising an organic solvent and a compound represented by Formula 1, which forms a silicon-containing film on the anode, enhancing stability and reducing resistance, and includes a mixture of cyclic and chain carbonate compounds with a fluorocarbonate compound to improve ion conductivity and film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used, then the battery can operate, but capacity retention and output characteristics deteriorate at high temperatures
Solution Approach 1:
The patent modifies the chemical composition parameters of the electrolyte by introducing a fluorocarbonate compound with specific molecular structure (Formula 1) containing F, O, and C atoms in defined ratios. This chemical parameter change enables the electrolyte to maintain stability and ion conductivity at elevated temperatures while improving capacity retention, directly resolving the temperature-related reliability contradiction.
Solution Approach 2:
The patent creates a composite electrolyte system by combining the fluorocarbonate compound (Formula 1) with conventional carbonate solvents (EC, PC, DEC, DMC). This composite approach leverages the beneficial properties of both components: the fluorocarbonate provides high-temperature stability and film-forming capability, while the conventional carbonates ensure good ion conductivity and electrochemical window, together resolving the contradiction between temperature stability and capacity retention.
2Power
If conventional electrolytes are used, then the battery can function, but resistance increases and output characteristics worsen
Solution Approach 1:
The fluorocarbonate compound in the electrolyte performs preliminary action by forming a stable protective film on the electrode surfaces during initial cycles. This pre-formed film reduces subsequent resistance by preventing harmful side reactions and providing a stable interface for ion transport, thereby improving output characteristics while minimizing resistance increase during battery operation.
Solution Approach 2:
The patent changes the chemical parameters of the electrolyte by incorporating fluorocarbonate compounds with specific fluorine content and molecular weight ranges. These parameter changes reduce the electrolyte's resistance to ion transport and improve its ability to form conductive SEI layers, directly addressing the resistance issue and enhancing power output characteristics.
3Duration of action of stationary object
If conventional electrolytes are used, then the battery operates, but thermal stability and lifespan are reduced
Solution Approach 1:
The patent converts the potential harm of high temperature operation into a benefit by using the fluorocarbonate compound's unique properties. The compound's fluorine atoms and specific molecular structure enable it to form exceptionally stable films that not only withstand but actually improve thermal stability through repeated heating and cooling cycles, thereby extending battery lifespan while maintaining operation at elevated temperatures.
Solution Approach 2:
The patent employs a composite electrolyte formulation combining fluorocarbonate (Formula 1) with conventional carbonate solvents in specific proportions. This composite material approach creates synergistic effects where the fluorocarbonate provides thermal stability and long-term durability, while the conventional carbonates maintain electrochemical performance, together achieving both improved lifespan and thermal stability.
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 the lithium battery's capacity retention, output characteristics, and thermal stability, maintaining firmness and reducing resistance, thus enhancing the battery's lifespan and performance at high temperatures.
Implementation Method 1
a compound represented by Formula 1, which forms a silicon-containing film on the anode
Implementation Method 2
improve ion conductivity
Data Source
AI summary
An electrolyte for a lithium battery includes an organic solvent; and a compound represented by Formula 1:wherein, in Formula 1, X1 to X4, A1 to A4, and R1 to R4 are further defined in the specification.