Fluorinated Vacancy Graphene Electrodes for Fast-Charging Li-Ion Batteries
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Solution Overview
Problem
Current lithium-ion secondary batteries face challenges in maintaining high output and energy density while minimizing deterioration and ensuring safety, particularly in high-temperature environments and during rapid charging, due to limitations in electrode materials and electrolyte stability.
Innovation Solution
The development of a graphene-based electrode with a vacancy formed by a many-membered ring composed of carbon atoms, where some carbon atoms are terminated with fluorine, which covers active material particles, enhancing lithium ion passage and reducing barrier energy for high conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional electrode materials are used, then the battery can operate, but the output and energy density are limited and deterioration occurs during rapid charging and high-temperature operation
Solution Approach 1:
The patent uses a composite structure where graphene with fluorine-terminated vacancies coats active material particles. This composite design combines the high conductivity of graphene with the stability of fluorine-terminated structures, enabling high output while preventing electrode deterioration during rapid charging and high-temperature operation.
Solution Approach 2:
The invention introduces fluorine atoms at specific vacancy sites in the graphene lattice, creating localized regions of high electron density and enhanced stability. This local modification of graphene structure at the vacancy sites improves both conductivity and resistance to deterioration without compromising the overall electrode structure.
2Quantity of substance
If conventional electrode structures are used, then the battery can be manufactured, but energy density and conductivity are insufficient for high-performance applications
Solution Approach 1:
The patent modifies the graphene structure by introducing fluorine atoms at vacancy sites, which changes the electronic parameters of the material. This parameter change enhances both the conductivity (for power) and the capacity for lithium ion insertion/extraction (for energy density) simultaneously.
3Power
If standard graphene is used as coating, then conductivity is improved, but stability and resistance to deterioration are insufficient
Solution Approach 1:
The patent creates a composite structure by combining graphene with fluorine atoms at vacancy sites. This composite maintains the high conductivity of graphene while adding the stability and protective properties of fluorine-terminated structures, resolving the contradiction between conductivity and stability.
Solution Approach 2:
The fluorine-terminated vacancy sites in the graphene coating provide preliminary protection to the active material particles against degradation during charging cycles. This pre-established protective structure prevents deterioration before it occurs, maintaining both conductivity and stability over time.
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
This approach results in a secondary battery with improved output, reduced deterioration, and enhanced safety, capable of operating across a wide temperature range with high energy density and rapid charging capabilities.
Implementation Method 1
enhancing lithium ion passage and reducing barrier energy for high conductivity and stability
Data Source
AI summary
Novel graphene is provided. A novel graphene compound is provided. An electrode having a high output is provided. A novel electrode is provided. A secondary battery with little deterioration is provided. A secondary battery with a high degree of safety is provided. Graphene has a vacancy formed with a many-membered ring that is a nine- or more-membered ring composed of carbon atoms. One or more of the carbon atoms included in the many-membered ring are terminated with fluorine.