▎ 摘　　要

NOVELTY - Graphene battery negative electrode material layer comprises an active layer, a layer (I) formed on the active layer and a layer (II) formed on the layer (I). The layer (I) is a composite material layer composed of nano-metal alloy and graphene. The layer (II) is a thin film containing elemental doped gallium nitride. The layer (I) and the layer (II) are both porous structures. The porosity of the layer (II) is greater than the porosity of the layer (I). The pores of the layer (II) are filled with a sulfonated elastomer capable of forming branch crosslinks with the element-containing doped gallium nitride group. USE - Graphene battery negative electrode material layer. ADVANTAGE - The lithium ion battery prepared from the negative electrode material layer has high lithium ion transmission efficiency, and has good lithium storage capacity and cycle performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a preparation of the negative electrode material layer of a graphene battery, which involves mixing the nano metal alloy and graphene to obtain a mixture, attaching the mixture to the active layer and sintering to obtain a layer (I) solidified on the active layer, spin-coating the elemental doped gallium nitride-based material on the layer (I) to form a layer (II) on the layer (I), in an inert atmosphere; and (2) a lithium ion battery which comprises the negative electrode material layer and the barrier layer impregnated with electrolyte and the positive electrode material layer of the battery. Two sides of the barrier layer are respectively located in the grooves of the battery negative electrode material layer and the battery positive electrode material layer to connect the battery negative electrode material layer and the battery positive electrode material layer.