Preparation method of lithium composite material, lithium composite material and lithium battery

The invention relates to a preparation method of a lithium composite material. The method comprises the following steps: preparing an electrostatic spinning solution containing porous graphene; performing electrostatic spinning on the electrostatic spinning solution to obtain a base material; and assembling the base material, a diaphragm, metal lithium and an electrolyte into a battery, and discharging to deposit the metal lithium on the base material to obtain the lithium composite material. According to the invention, lithium can be uniformly deposited, lithium dendrites are not easy to generate, and graphene also has a hindering effect on the formation of the lithium dendrites. Therefore, the formation of lithium dendrites can be inhibited, and the safety and cyclicity of the metal lithium battery are improved. 本申请涉及一种锂复合材料的制备方法，所述方法包括如下步骤：制备含多孔石墨烯的静电纺丝液；对所述静电纺丝液进行静电纺丝，得到基材；将所述基材与隔膜、金属锂、电解液组装成电池后进行放电，使所述金属锂沉积到所述基材上，得到所述锂复合材料。本申请可以使锂能够比较均匀地沉积，不容易产生锂枝晶，且石墨烯对锂枝晶的形成也具有阻碍作用。因此本申请能够抑制锂枝晶的形成，增加金属锂电池的安全性与循环性。