Amorphous Fluoroelastomer Electrolyte for Low-Volatility Solid-State Batteries
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Solution Overview
Problem
Existing polymer-based solid-state batteries face limitations due to high volatile content in their electrolytes, leading to a limited operating temperature range and poor long-term reliability, while existing solid-state electrolytes lack sufficient oxidation resistance and flame retardancy.
Innovation Solution
A composite comprising an amorphous fluorine-containing elastomer with a glass transition temperature of 25°C or less and a volatile content of 0.1% or less, combined with an alkali metal salt, ionic liquid, and optional additives, enhances ion-conducting properties, oxidation resistance, and flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing polymer-based solid-state batteries use conventional electrolytes, then they can be manufactured, but they exhibit high volatile content leading to limited operating temperature range and poor long-term reliability
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte by incorporating fluorinated cyclic carbonate and chain carbonate in specific ratios (60-95 wt% and 5-40 wt% respectively), which fundamentally alters the volatility characteristics and thermal stability of the electrolyte system, enabling low volatile content and wide temperature operation
Solution Approach 2:
The patent creates a composite electrolyte system by combining fluorinated cyclic carbonate and chain carbonate in specific proportions, forming a synergistic mixture that achieves both low volatility and high ion conductivity, resolving the contradiction between reliability and substance loss
2Object-affected harmful factors
If existing solid-state electrolytes are used to improve safety, then oxidation resistance may be enhanced, but flame retardancy and operating temperature range remain insufficient
Solution Approach 1:
The patent modifies the electrolyte composition by introducing fluorinated cyclic carbonate with specific molecular structure parameters, which enhances oxidation resistance through fluorine atoms while simultaneously expanding the operating temperature range through optimized glass transition temperature and viscosity parameters
Solution Approach 2:
The patent applies local quality enhancement by using fluorine substitution at specific positions in the cyclic carbonate structure, creating regions of high oxidation resistance while maintaining overall fluidity and temperature adaptability of the electrolyte system
3Reliability
If conventional electrolyte compositions are used, then manufacturing is straightforward, but ion-conducting properties and flame retardancy are insufficient
Solution Approach 1:
The patent optimizes the weight percentage parameters of fluorinated cyclic carbonate (60-95 wt%) and chain carbonate (5-40 wt%) to achieve flame retardancy while maintaining ease of manufacture through straightforward mixing and filling processes without complex synthesis steps
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 composite provides excellent ion-conducting properties, oxidation resistance, and flame retardancy, ensuring a wider operating temperature range and improved long-term reliability for polymer-based solid-state batteries.
Implementation Method 1
solid-state electrolytes having high ion-conducting property comparable to non-aqueous electrolytic solution have been developed
Implementation Method 2
at least one ionic liquid selected from combinations of 1-butyl-3-methyl imidazolium (BMI) cation or N-methyl-N-butyl-pyrrolidium (Pyr14) cation as an organic cation and BF4 anion or bis(trifluoromethanesulfonyl)imide (TFSI) anion as an anion
Data Source
AI summary
Provided are a composite that can be suitably used as an electrolyte in polymer-based solid-state batteries, and various electrochemical devices using the composite. The composite includes a fluorine-containing elastomer and an alkali metal salt as essential components, wherein the fluorine-containing elastomer is an amorphous fluorine-containing elastomer having a glass transition temperature of 25° C. or less, and the composite has a volatile content of 0.1 mass % or less with respect to the entire composite.