Preparation method of graphene flower and use of graphene flower in lithium sulfur battery
AssigneeZhejiang University
InventorsChao Gao, Hao Chen
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Abstract
Disclosed in the present disclosure is a preparation method of a graphene flower, mainly lying in spray-drying graphene oxide solution to obtain a graphene oxide flower and then performing reduction on the same to obtain a graphene flower. Also disclosed in the present disclosure is use of the graphene flower in a lithium sulfur battery. The present disclosure is easy to operate, low cost, and suitable for scaled production, can improve the rate capability of a lithium sulfur battery while ensuring the high energy ratio of the lithium sulfur battery, thus greatly improving the energy density thereof, and can be applied in the field of high energy storage material and devices.
Claims8
A preparation method of a graphene flower, wherein comprising steps of:
- 1) dissolving a graphene oxide raw material in a solvent and stirring to obtain a graphene oxide solution;
- 2) spray-drying the graphene oxide solution to obtain graphene oxide flower powder;
- and
- 3) performing reduction on the graphene oxide flower by using a reducing agent or by high-temperature heat treatment to obtain the graphene flower;
- wherein a temperature for the spray-drying in the step 2) is 60-200° C., and a diameter of a spray nozzle is 0.1-100 microns.
- wherein the reducing agent the step 3) is selected from a group consisting of an aqueous solution of hydrogen iodide with a volume percentage being 5%-50%, a sodium ascorbate solution, and hydrazine hydrate vapor, and the high-temperature heat treatment is carried out at 1000-3000° C. in nitrogen or argon atmosphere for a time of 10-1000 minutes.
Dependencies are inferred from the claim text.