Fluorinated Gel Electrolyte for High-Power Battery Stability
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Solution Overview
Problem
Conventional secondary batteries face challenges in achieving both high power characteristics and stability, with issues such as explosion and combustion due to thermal runaway, and poor adhesion and workability of gel-polymer electrolytes.
Innovation Solution
A gel electrolyte composition is developed, incorporating a fluorine-containing copolymer, lithium salt, and an organic solvent, which is gelated on the surface of the negative electrode to enhance stability and prevent performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gel-polymer electrolyte is used to improve thermal stability and prevent electrolyte leakage, then flame retardant performance is improved, but adhesion property to the negative electrode surface deteriorates
Solution Approach 1:
The patent uses a composite gel-polymer electrolyte comprising a fluorinated polymer matrix (providing flame retardancy) and a non-fluorinated polymer component (improving adhesion). This composite structure combines the advantages of both materials: the fluorinated polymer contributes to thermal stability and flame resistance, while the non-fluorinated polymer enhances adhesion to the negative electrode surface, thereby resolving the technical contradiction between flame retardant performance and adhesion property.
2Power
If the power characteristic is increased to achieve higher capacity and faster charging, then energy output is improved, but stability deteriorates due to thermal runaway and side reactions
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by introducing fluorinated polymers with specific fluorine content (5-50 wt%) and using fluorinated solvents. This parameter change enhances the thermal stability and flame retardancy of the electrolyte system, allowing the battery to operate at higher power levels without triggering thermal runaway, thus resolving the contradiction between power characteristic and stability.
3Power
If the temperature of the secondary battery is increased to improve power output, then energy delivery is improved, but side reaction increases causing performance degradation
Solution Approach 1:
The fluorinated polymer electrolyte creates a chemically inert environment within the battery due to the strong C-F bonds and low reactivity of fluorinated compounds. This inert environment suppresses side reactions between the electrolyte and electrode materials even at elevated temperatures, allowing the battery to maintain stable charge/discharge capacity while delivering high power, thereby resolving the contradiction between energy delivery and composition 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 gel electrolyte composition exhibits excellent flame retardant properties, preventing fires and explosions in secondary batteries, while maintaining high power performance and extending the battery's lifespan.
Implementation Method 1
A gel electrolyte composition is developed, incorporating a fluorine-containing copolymer, lithium salt, and an organic solvent, which is gelated on the surface of the negative electrode to enhance stability and prevent performance degradation
Implementation Method 2
The gel-polymer electrolyte is an intermediate electrolyte which may improve both the lower stability of the liquid electrolyte and the lower ion conductivity of a solid-polymer electrolyte by using the principle that lithium ions rapidly move through pores formed along polymer fiber entangled in a gel form
Data Source
AI summary
The present disclosure relates to a gel electrolyte composition including a fluorine-containing copolymer including repeating units represented by following Formula 1 and following Formula 2, lithium salt, and an organic solvent, and a secondary battery including the same.