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Mr. Kai Zhu and Mr. Dengxue Cao and their team at Harbin Engineering University have recently published a new article on Joule heating, which focuses on the preparation of highly defective graphene by flash Joule heating technique and investigates its application in lithium-ion batteries - the study of high-capacity lithium anode materials based on defect design, and in-depth discussion of its energy storage mechanism, and get the conclusion that this graphene has ultra-high lithium ion storage capacity. This article provides a new perspective for the application of graphene in lithium-ion batteries.
Using graphite oxide (GO) as a precursor for defect engineering and doping, GO is rapidly processed by lightning Joule heating technology to remove complex functional groups and introduce a large number of defects to prepare highly defective reduced graphite oxide (F-rGO), and the entire process is completed within 1 millisecond.
Innovative preparation technology:
Highly defective reduced graphite oxide (F-rGO) is prepared in less than 1 millisecond (620 microseconds) by Joule thermal flash evaporation technology.
High defect density:
FJH technology can produce a high density of defects in the graphene lattice, which helps to improve the lithium-ion storage capacity.
Ultra-high capacity:
The material achieves an ultra-high storage capacity of up to 2500mAh/g, which is significantly better than existing graphene-based negative electrode materials.
Stable and long-lasting performance:
High storage capacity can be achieved despite the increase in the number of cycles.
Composite Structure Preparation:
Electrospinning can be used to mix F-rGO prepared by Lightning Joule Heating with other polymers or nanomaterials to form composite materials with specific functions. For example, F-rGO can be used as a reinforcing agent or conductive filler, combined with a polymer matrix, and formed into functional nanofibers by electrospinning.
Surface Modification:
Electrospinning technology can wrap a layer of polymer on the surface of F-rGO to improve its stability and compatibility in specific applications, such as as a drug carrier or tissue engineering scaffold in the biomedical field.
Structural Optimization:
Through electrospinning technology, F-rGO can be dispersed in a polymer solution, and then the morphology and structure of the final fiber can be controlled by adjusting the spinning parameters (such as voltage, flow rate, collection distance, etc.), thereby optimizing its performance in energy storage and conversion devices.
Functionalized Fibers:
Electrospinning technology can be used to prepare fibers with specific surface functionalization, for example, by adding specific chemical groups or molecules to the spinning solution to make F-rGO fibers have specific chemical activity or biocompatibility.
The FJH method effectively reduced GO, significantly reduced the oxygen content, and formed a 3D carbon network containing a large number of intrinsic defects. The emerging defects that appeared during the cycling process promoted the increase in capacity, and the capacity was as high as 2450mAh/g (1A/g) after 1000 cycles, which is higher than graphene synthesized by other methods. Although the formation of deposited lithium will reduce the capacity, the tightly connected 3D network can withstand the volume expansion during the negative electrode cycling process, and the reversible capacity is 1007mAh/g at a current density of 5A/g after 5000 cycles. Although graphene-based lithium batteries still face challenges such as low first discharge efficiency and self-discharge, this preparation method provides a new approach and provides new insights into the changes in similar thin-layer electrodes during cycling.
Electrospinning Nanofibers Article Source:
https://www.sciencedirect.com/science/article/pii/S1385894723067207
