▎ 摘　　要

NOVELTY - Method for preparing nano-copper oxalate composite three-dimensional graphene anode material, involves (a) putting the lithium sheet in a ceramic boat in the inert gas glove box, putting the ceramic boat in a tube furnace, and evacuating the tube furnace until the pressure in the tube furnace is reduced to 10 Pa, (b) filling the tube furnace with carbon dioxide gas, and heating the tube furnace to obtain a crude three-dimensional graphene product, (c) pulverizing the crude three-dimensional graphene product to obtain a powdery crude three-dimensional graphene product, (d) soaking the powdery three-dimensional graphene crude product in concentrated nitric acid, (e) adding metal copper powder or copper salt into the suspension and fully stirring, and (f) continuously magnetically stirring the suspension and slowly dripping absolute ethyl alcohol. USE - The method is used for preparing nano-copper oxalate three-dimensional graphene anode material, which is used in a lithium ion battery (all claimed). ADVANTAGE - The prepared nano-copper oxalate three-dimensional graphene anode material improves the coulombic efficiency of the obtained three-dimensional graphene anode material. DETAILED DESCRIPTION - Method for preparing nano-copper oxalate composite three-dimensional graphene anode material, involves (a) putting the lithium sheet in a ceramic boat in an inert gas glove box, putting the ceramic boat in a tube furnace, and evacuating the tube furnace until the pressure in the tube furnace is reduced to 10 Pa, (b) filling the tube furnace with carbon dioxide gas, and heating the tube furnace to 550-600 degrees C for 24-48 hours to obtain a crude three-dimensional graphene product, (c) pulverizing the crude three-dimensional graphene product to obtain a powdery crude three-dimensional graphene product, (d) soaking the powdery three-dimensional graphene crude product into concentrated nitric acid for more than 2 hours, where the mass ratio of the three-dimensional graphene crude product to concentrated nitric acid is more than 1:2, (e) adding metal copper powder or copper salt into the suspension and fully stirring, so that the mass ratio of the crude product of the three-dimensional graphene to the copper in the suspension reaches 100:(1-5) and (f) continuously magnetically stirring the suspension and slowly dripping absolute ethyl alcohol until the molecular weight ratio of copper to ethanol in the suspension reaches 1:(1-2).