▎ 摘　　要

NOVELTY - Preparing silicon-based material comprises dispersing the siloxane material and the metal magnesium powder with the set magnesium : silicon molar ratio in mineral oil to obtain dispersion liquid A, dispersing the dispersant in mineral oil to obtain dispersion B, dispersing expanded graphite in mineral oil to obtain dispersion C, mixing the dispersion liquid A, the dispersion liquid B and the dispersion liquid C according to the mass ratio of 1:1:1, sand grinding and emulsification treatment, exfoliating the graphene from the expanded graphite under the action of the shear force during the emulsification process to obtain Graphene slurry, spray-drying the graphene slurry, sintering the spray-dried product under a nitrogen atmosphere, cracking the siloxane material to generate silicon oxide, obtaining nano-silicon by reduction under the action of metal magnesium powder, and forming magnesium silicate. USE - The material is useful in lithium battery cathode material and pole piece (all claimed). ADVANTAGE - The material has higher energy density. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for silicon-based material prepared by the above method. DESCRIPTION OF DRAWING(S) - The diagram shows a flowchart of the method for preparing silicon-based material (Drawing includes non-English language text).