Nitrogen-doped carbon nanotube packaged nickel nanoparticle skeleton and preparation and application thereof

According to the nitrogen-doped carbon nanotube packaged nickel nanoparticle skeleton and the preparation and application thereof, the growth of sodium dendrites is inhibited, the electrodeposition and stripping reversibility of a sodium metal negative electrode is improved, and high coulombic efficiency and stable circulation of metal sodium in tests of half batteries and symmetrical batteries are achieved. The deposition framework disclosed by the invention has a large specific surface area, and can effectively reduce local current density, inhibit sodium dendrite growth and relieve volume expansion; nitrogen doping increases the sodium affinity of a deposition skeleton, can reduce nucleation overpotential, has high local electron density, and can induce uniform deposition of sodium. In addition, free electrons can be transferred to a carbon layer from nickel nanoparticles, so that electrons are enriched on the carbon surface, and uniform deposition of sodium on the surface of a skeleton is promoted. The de