The invention discloses a
tin cobalt alloy /
graphene composite material and a preparation method of the
tin cobalt alloy /
graphene composite material. The preparation method of the
tin cobalt alloy /
graphene composite material includes the following steps that firstly, graphene
oxide is dispersed into methyl
alcohol or ethylalcohol or
ethylene glycol or
diethylene glycol, and then suspension liquid is prepared; secondly,
cobalt salt and tin slat of which the
mass ratio of the sum of
mass to the
mass of graphene
oxide ranges from 60:1 to 30:1 dissolve in the suspension liquid prepared through the first step, wherein the
molar ratio of a cobalt element to a
tin element ranges from 1: 0.66 to 1:3; thirdly, a
sodium borohydride alcoholic solution of which the concentration ranges from 1 mol / L to 2.5 mol / L is prepared,
alcohol used in the first step is used in this step, the
sodium borohydride alcoholic solution is mixed with the suspension liquid obtained through the second step,
nitrogen is injected, and after 10 minutes of bubbling,
solvent heat treatment is conducted, wherein
solvent heat treatment refers to the process that a mixture reacts for 6 h to 12 h at the temperature of 100 DEG C to 160 DEG C in a closed reaction kettle and then is cooled to the
room temperature, and the
molar ratio of the cobalt element in
sodium borohydride to the cobalt element in the
cobalt salt is 6-13 to 1; fourthly, a sample obtained in the third step is repeatedly washed centrifugally in ethyl
alcohol and deionized water, and a product is obtained after
vacuum drying.