The team of professor Wang Bo of the School of Materials Science and Engineering of Hebei University of Science and Technology and the team of professor Wang Wei of the School of Space and Environment of Beijing University of Aeronautics and Astronautics have successfully prepared a flexible amorphous carbon fiber that can generate a stable electrolyte interface film, and control the thickness of the electrolyte interface film. In the range of 2~4nm. Related research results were published online in "Nano Energy" recently.
In recent years, carbon anode materials have become a research hotspot in the field of potassium ion batteries due to their advantages such as low price and high electronic conductivity. However, the formation of too much solid electrolyte interface film consumes a lot of electrolyte and leads to a higher irreversible capacity, which is one of the important challenges faced by the scientific research of carbon materials.
Through the selection of raw materials and process control, the research team prepared a phosphorus-sulfur co-doped flexible carbon fiber film with silica and magnesium oxide nanoparticles on the surface. Due to the uniform distribution of silica and magnesium oxide nanoparticles, a solid electrolyte interface film with a thickness of 2 to 4 nm is formed. This solid electrolyte interface membrane can not only protect the electrolyte from continuous decomposition, but also prevent electron penetration, and at the same time achieve smooth insertion/extraction of potassium ions. In addition, phosphorus-sulfur co-doping can enhance the adsorption capacity of potassium ions, while improving electrical conductivity.
This research not only confirmed the formation mechanism of a uniform and stable electrolyte interface film, but also provided new ideas for the development of high-rate energy storage and low-cost flexible electrodes. (Reporter Gao Changan correspondent Shi Xiujie)
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