2results about How to "Increase the distance between layers" patented technology

The application discloses a preparation method of functionalized iron oxide nanoparticles. Firstly, the interlayer distance of graphite is increased under the action of a bicarbonate ammonia dispersant through high-energy ball milling treatment, and bismuth trisulfide which can inhibit hydrogen evolution is uniformly loaded on the graphite powder through the ball milling effect; then, the formed iron oxide and bismuth trisulfide are fully mixed through an in-situ deposition method; after further high-energy ball milling treatment to form uniform particles, the particles are subjected to hydrothermal treatment together with carbon nanotubes, so that the carbon nanotubes and the graphite and iron oxide particles form an interwoven network structure, a large amount of space is provided in the electrode, and the interlayer structure of the graphite also fully weakens the passivation phenomenon of the iron electrode. When the functionalized iron oxide nanoparticles are applied to an iron-air battery, the main problems existing in the iron-air battery can be solved in a targeted manner, and the application has important practical significance.

This application provides a negative electrode active material and its preparation method, a negative electrode sheet, a sodium-ion battery, and electrical devices, relating to the field of sodium-ion batteries. The negative electrode active material includes a carbon matrix and phosphorus, nitrogen, sulfur, and boron doped into the carbon matrix; based on the total mass of the negative electrode active material, the phosphorus content is 1-10 wt%, the nitrogen content is 1-10 wt%, the sulfur content is 1-3 wt%, and the boron content is 1-3 wt%. The specific doping amounts of phosphorus, nitrogen, sulfur, and boron in this application, combined with the carbon matrix, enable the negative electrode active material to possess excellent cycle stability, excellent rate performance, and high capacity, while reducing volume expansion during cycling and minimizing adverse problems such as electrode breakage.