▎ 摘　　要

NOVELTY - Graphene bridged polythiophene coated germanium nanoparticle composite material comprises 70-98 wt.% germanium nanoparticles, 0.05-29.95 wt.% polythiophene and 0.05-29.95 wt.% reduced graphene oxide, where the polythiophene is coated on the surface of the germanium nanoparticles. The reduced graphene oxide is bridged to the polythiophene coated with germanium nanoparticles. The mass fraction of the polythiophene and reduced graphene oxide is less than or equal to 30%. USE - Graphene bridged polythiophene coated germanium nanoparticle composite material for lithium-ion batteries (claimed). ADVANTAGE - The graphene bridged polythiophene coated germanium nanoparticle composite material is prepared with high energy density, good cycle stability, good rate performance and good composite uniformity in a simple and cost-effective manner. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing graphene bridged polythiophene coated germanium nanoparticle composite material, which involves: (A) dissolving germanium dioxide in an alkaline solution, then adding dropwise acid solution to adjust to neutrality, then adding reduced graphene oxide and dispersant, and performing ultrasonic vibration to form a suspension, and transferring the suspension into a water bath at 50-60 degrees C to obtain solution A; (B) dissolving the sodium borohydride powder in water at 1-4 degrees C, pouring the resulting sodium borohydride solution into the solution A, and performing a stirring reaction in a water bath at 50-60 degrees C to obtain solution B; (C) filtering the solution B to obtain precipitate, and washing and drying the resulting precipitate, and then calcining in an inert gas or a reducing gas at 500-800 degrees C for 0.5-24 hours to obtain composite material; and (D) adding the composite material to water, ultrasonically dispersing, then adding an aqueous solution of polythiophene, performing ultrasonic vibration, and then vacuum freeze-drying at -10 degrees C to 0 degrees C to remove water, and then vacuum drying at 100-140 degrees C to obtain a graphene-bridged polythiophene-coated germanium nanoparticle composite material.