Fluorinated Phosphate Electrolyte for Battery Safety
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Solution Overview
Problem
Lithium ion batteries face safety issues due to increased energy density, including gas production and degradation of kinetic performance, which are not adequately addressed by existing technologies.
Innovation Solution
An electrolyte comprising a fluorine-containing phosphate ester and a carboxylate ester, with optional boron or phosphazene compounds, is used to reduce gas production, enhance high-temperature storage performance, and improve safety by regulating the weight ratios and concentrations within specific ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If energy density of lithium ion batteries is increased, then battery capacity and operating voltage are improved, but safety issues and gas production increase
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing fluorine-containing phosphate esters with specific molecular structures (Formula 1 and Formula 2) and controlling their content within 1-10 wt%, which modifies the electrolyte's physical and chemical properties to improve safety while maintaining energy density
Solution Approach 2:
The patent creates a composite electrolyte system by combining fluorine-containing phosphate esters with conventional carbonate esters and chain carbonates, forming a multi-component electrolyte composition that leverages the flame-retardant properties of the fluorine-containing compounds while maintaining the good electrochemical performance of conventional electrolytes
2Use of energy by moving object
If energy density of lithium ion batteries is increased, then battery capacity is improved, but gas production increases
Solution Approach 1:
The patent modifies the electrolyte composition by incorporating fluorine-containing phosphate esters at controlled concentrations (1-10 wt%), which changes the chemical environment at the electrode-electrolyte interface to suppress gas-generating side reactions while maintaining high energy density performance
3Reliability
If conventional electrolyte composition is used, then electrochemical performance is maintained, but kinetic performance degradation occurs and safety is compromised
Solution Approach 1:
The patent optimizes the electrolyte composition parameters by precisely controlling the content of fluorine-containing phosphate esters (1-10 wt%) and their molecular structure parameters (R1, R2, R3 groups), which improves kinetic performance and cycle stability without compromising electrochemical compatibility
Solution Approach 2:
The fluorine-containing phosphate esters act as intermediary substances that mediate between the electrode and conventional electrolyte, forming protective interface layers that reduce degradation reactions and improve long-term cycle performance while maintaining good electrochemical 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 composition improves kinetic performance, reduces degradation, and enhances safety by inhibiting side reactions and ensuring better electrochemical stability and cycle performance in lithium ion batteries.
Implementation Method 1
The electrolyte composition improves kinetic performance, reduces degradation, and enhances safety by inhibiting side reactions and ensuring better electrochemical stability
Implementation Method 2
An electrolyte comprising a fluorine-containing phosphate ester and a carboxylate ester, with optional boron or phosphazene compounds, is used to reduce gas production, enhance high-temperature storage performance, and improve safety by regulating the weight ratios and concentrations within specific ranges
Data Source
AI summary
An electrolyte, including a fluorine-containing phosphate ester and a carboxylate ester, wherein the fluorine-containing phosphate ester is represented by Formula 1:R1, R2 and R3 are each independently selected from hydrogen, a C1-C10 alkyl group, C1-C10 alkoxy group, C1-C10 haloalkyl group, C1-C10 haloalkoxy group, C1-C10 phosphate ester group, or C1-C10 mono- or multiple-carbonate ester group, wherein at least one of R1, R2 and R3 comprises a fluorine atom. The weight ratio of the fluorine-containing phosphate ester to the carboxylate ester is 0.001-0.5.