Flash Joule Heating Machine: High temperature thermal shock constructs oxygen-rich vacancy MgFeSiO₄ positive electrode, nearly doubling the capacity

Similarity of technical principles and applications

High-temperature thermal shock and defect regulation: Associate Professor Chen Yanan's team used ultrafast high-temperature shock technology (HTS) to introduce a large number of oxygen vacancies into MgFeSiO4. Through the non-equilibrium high-temperature shock method, the material was heat-treated at an extremely fast heating rate (~10³ K s⁻¹), generating and retaining oxygen vacancies in a short time. Flash Joule Heating Machine (FJH) technology can also quickly heat the material to a high temperature, triggering the reorganization of the internal structure of the material and the formation of defects, and realizing precise regulation of the material's microstructure. Both use the violent reaction conditions brought about by high-temperature thermal shock to promote the efficient introduction of defects (such as oxygen vacancies) in the target material, providing strong support for improving material performance.

Rapid heating and material performance optimization: HTS technology achieves the introduction of high-content oxygen vacancies in MgFeSiO4 cathode materials through rapid heating, significantly improving the magnesium ion diffusion kinetics and electrochemical performance. FJH technology is also commonly used for rapid heating and performance optimization in the preparation of other materials. For example, in the preparation of carbon-based materials such as graphene, the defect density and electronic structure of the material can be regulated by rapid heating, thereby optimizing its conductivity and chemical activity. This association between rapid heating and material performance optimization is of great significance for the development of high-performance energy storage materials.

Complementarity of technical advantages

High efficiency and low cost: HTS technology can complete the defect introduction and structural optimization of materials in a short time, and is highly efficient. FJH technology also greatly shortens the time for material preparation, improves production efficiency, and reduces production costs with its characteristics of rapid heating and cooling. The combination of the two can further improve the efficiency and performance of material preparation, reduce production costs, and provide technical support for the large-scale production of high-performance magnesium battery positive electrode materials.

Environmental friendliness: HTS technology avoids the long-term energy consumption and possible environmental pollution in traditional high-temperature treatment processes. 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 MgFeSiO4 positive electrode materials. Through further rapid heat treatment, the crystal structure and defect distribution of the material can be optimized to improve its magnesium storage performance and cycle stability. For example, more uniform oxygen vacancy distribution and stronger metal-oxygen bonds can be achieved through FJH technology, which can enhance the structural stability of the material and the diffusion kinetics of magnesium ions.

Development of new positive electrode materials: Combine the rapid synthesis capability of FJH technology and the defect regulation advantage of HTS technology to explore and develop new magnesium battery positive electrode materials. For example, try to use FJH technology to perform rapid heat treatment and structural optimization on other types of transition metal oxides or composite materials 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 HTS technology in the material preparation process, and 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 magnesium battery positive electrode materials.

Electrospinning Nanofibers Article Source:

https://doi.org/10.1021/acs.nanolett.4c04908