| abstract |
The invention belongs to potassium ion batteries, and in particular relates to a potassium ion battery vanadium phosphate@carbon/expanded microcrystalline graphite composite negative electrode active material, comprising expanded microcrystalline graphite, and vanadium phosphate embedded in the pores of the expanded microcrystalline graphite and between layers in situ @Carbon composite particles; the present invention also provides the preparation and application of the material. The negative electrode active material of the potassium ion battery of the present invention uses expanded microcrystalline graphite as a skeleton, and innovatively inserts (Qiaolian) carbon-coated vanadium phosphate particles in its pores and between layers, and the material also has excellent ionic conductivity. The properties and electronic conductivity help to improve the intercalation and deintercalation stability of potassium ions, and help to improve the capacity, rate and cycle stability of the material. |