▎ 摘　　要

NOVELTY - Preparing three-dimensional porous copper/graphene composite current collector comprises e.g. (i) taking 30 wt.% copper, and 70 wt.% manganese, and dealloying, and (ii) placing the nano-porous metal foil in a quartz boat, placing quartz boat in a reaction tube furnace near the nozzle area, introducing argon gas and hydrogen gas, heating the furnace, rapidly moving the quartz boat to the constant temperature zone in the middle of the reaction tube, and calcinating, introducing ammonia, acetylene, argon, and hydrogen gas, opening the lid, removing the sample from the tube furnace. USE - The three-dimensional porous copper/graphene composite current collector is useful for cathode lithium secondary battery (claimed). DETAILED DESCRIPTION - Preparing three-dimensional porous copper/graphene composite current collector comprises (i) taking 30 wt.% copper, and 70 wt.% manganese based on atomic percentage to obtain copper-manganes alloy foil, and dealloying to obtain clean nanoporous metal foil, (ii) placing the nano-porous metal foil obtained in the previous step in a quartz boat, placing quartz boat in a reaction tube furnace near the nozzle area, introducing argon gas and hydrogen gas, and setting the ratio of argon gas and hydrogen gas at flow rate of 500:200, heating the furnace at 800-1000 degrees C, heating the furnace temperature to the specified temperature, rapidly moving the quartz boat to the constant temperature zone in the middle of the reaction tube, and calcinating at this temperature for 0.5-5 minutes, introducing ammonia, acetylene, argon, and hydrogen gas at flow rate of 0-30:5-50:500:200, quickly moving the quartz boat from the constant temperature zone in the middle of the reaction tube to the nozzle area, opening the lid, allowing to cool the sample to room temperature in an argon atmosphere, removing the sample from the tube furnace to obtain three-dimensional porous copper/graphene composite current collector. An INDEPENDENT CLAIM is also included for preparing metallic lithium cathode using the current collector, comprising using three-dimensional porous copper/graphene composite current collector obtained in the step (ii) as working electrode, and the counter electrode as lithium plate, forming electrochemical system, first circulating 5 cycles at current density of 0.05 mA/cm2 in a voltage range of 0.01-3 V, forming stable SEI film, and depositing metal lithium at current density of 0.5-2.0 mA/cm2 for 1-2 hours to obtain metal lithium cathode with different capacities.