Sandwich-type graphene composite structure for anode material of lithium ion secondary battery and manufacturing method thereof
AssigneeDongguk University Industry-Academic Cooperation Foundation
InventorsYongmook KANG, Daniel Adjei AGYEMAN, Kyeongse SONG, Gihyeok LEE
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Abstract
A sandwich-type graphene composite structure formed of carbon-coated silicon nanoparticles and graphene, and a method for manufacturing the same are provided. The sandwich-type graphene composite structure is formed of a carbon-coated silicon graphene through an environmentally friendly filtration process. The formed sandwich-type graphene composite structure relieves the volume expansion of the silicon. In addition, the carbon coated on the silicon surface improves electrical conductivity and may be used as a high-capacity anode material.
Claims9
A sandwich-type graphene composite structure, comprising:
- a first graphene oxide sheet layer;
- a silicon nanoparticles layer disposed on the first graphene oxide sheet layer;
- and
- a second graphene oxide sheet layer formed on the silicon nanoparticle layer.
A method of manufacturing a sandwich-type graphene composite structure, comprising:
- preparing a buffer solution containing dopamine hydrochloride;
- forming polydopamine-coated silicon nanoparticles by forming a first solution by mixing silicon nanoparticles in the buffer solution;
- forming a sandwich-type graphene composite structure by alternately filtering a second solution containing graphene oxide sheets and the first solution containing the polydopamine-coated silicon nanoparticles;
- and
- forming carbon-coated silicon nanoparticles by thermally treating the sandwich-type graphene composite structure, and inducing a chemical bond between the carbon-coated silicon nanoparticles and the graphene oxide sheets.
Dependencies are inferred from the claim text.