Flash Joule Heating Machine: 154 seconds 950℃ thermal shock to construct defect-rich nitrogen-doped expanded graphite

Similarity of technical principles and applications

Rapid heating and non-equilibrium reaction: The "Ultrafast thermal shock synthesis" paper mentioned that ultrafast non-equilibrium thermal shock is used to generate defect-rich structures and achieve nitrogen doping, thereby improving the sodium ion adsorption capacity and diffusion kinetics of the material. The Flash Joule Heating Machine (FJH) technology can also quickly heat the material to a high temperature, trigger a non-equilibrium reaction, and achieve rapid synthesis and structural transformation of the material. Both use the non-equilibrium state brought about by rapid heating to promote the reorganization of the internal structure of the material and the formation of defects, laying the foundation for subsequent electrochemical performance improvement.

Regulation of structural defects and doping: In the "Ultrafast thermal shock synthesis" study, the thermal shock process introduces a large number of structural defects and achieves doping of pyridine nitrogen and pyrrole nitrogen. FJH technology can also achieve regulation of material defects and doping elements by precisely controlling heating parameters. For example, in the synthesis of two-dimensional materials, FJH technology has been used to regulate the defect density and doping type of the material. This precise regulation of structural defects and doping is crucial to improving the electrochemical performance of the material, and helps to optimize the sodium storage capacity and cycle stability of the negative electrode material of the sodium ion battery.

Complementarity of technical advantages

High efficiency and low cost: The "Ultrafast thermal shock synthesis" method can complete the synthesis and structural optimization of materials in a short time, and is highly efficient. FJH technology also has the characteristics of rapid heating and cooling, which greatly shortens the time of material preparation and improves production efficiency. The combination of the two can further improve the efficiency of material preparation, reduce production costs, and provide technical support for the large-scale production of high-performance sodium-ion battery negative electrode materials.

Environmental friendliness: The "Ultrafast thermal shock synthesis" method avoids the complex steps and high-temperature and long-term treatment in traditional methods, reducing energy consumption and environmental pollution. FJH technology does not require the use of solvents or reaction gases during the material synthesis process, and is an environmentally friendly preparation method. The combination of the two helps to achieve a greener and more sustainable material preparation process, which meets the current requirements of environmental protection and sustainable development.

Combination direction of future research and application

Further optimization of material properties: FJH technology can be applied to the subsequent treatment of nitrogen-doped expanded graphite (EGN) materials prepared by "Ultrafast thermal shock synthesis". Through further rapid heat treatment, the crystal structure and defect distribution of the material can be optimized, and its sodium storage performance and cycle stability can be improved. For example, more uniform nitrogen doping and richer active sites can be achieved through FJH technology, which can enhance the adsorption and diffusion dynamics of sodium ions.

Development of new negative electrode materials: Combine the rapid synthesis capability of FJH technology and the structural regulation advantages of the "Ultrafast thermal shock synthesis" method to explore and develop new negative electrode materials for sodium ion batteries. For example, try to use other types of carbon materials or composite materials for rapid heat treatment and structural optimization through FJH technology to achieve higher specific capacity and better rate performance.

Optimization and standardization of process parameters: In-depth study of the synergistic mechanism of FJH technology and "Ultrafast thermal shock synthesis" method in the material preparation process, optimize process parameters such as heating temperature, heating time, current density, etc. Establish a standardized process flow to ensure the stability and consistency of material performance, and provide reliable technical support for the commercial production and application of negative electrode materials for sodium ion batteries.

Electrospinning Nanofibers Article Source:

https://doi.org/10.1016/j.cej.2025.159326