• 专利标题:   Making sulfur-graphene composite material, by adding elemental sulfur solution in graphene oxide dispersion, and adding reducing agent to mixed solution, where solution includes first solvent and elemental sulfur dissolved in first solvent.
  • 专利号:   US2013171355-A1, JP2013139371-A, TW201326027-A, CN103187558-A, JP5538498-B2, TW455871-B1, CN103187558-B
  • 发明人:   WANG L, HE X, LI J, GUO J, SUN W, REN J, LI W, XIANGMING H, LI J J, GUO J W, SUN W T
  • 专利权人:   HON HAI PRECISION IND CO LTD, UNIV TSINGHUA, UNIV TSINGHUA, HON HAI PRECISION IND CO LTD, HON HAI PRECISION IND CO LTD, HONGFUJIN PRECISION IND SHENZHEN CO LTD, UNIV TSINGHUA, UNIV TSINGHUA, HON HAI PRECISION IND CO LTD
  • 国际专利分类:   B05D001/18, B05D003/04, B05D003/10, B82Y030/00, B82Y040/00, C01B031/02, H01M004/58, C01B017/00, C01B031/04, H01M004/38
  • 专利详细信息:   US2013171355-A1 04 Jul 2013 B05D-001/18 201348 Pages: 8 English
  • 申请详细信息:   US2013171355-A1 US554120 20 Jul 2012
  • 优先权号:   CN10447288

▎ 摘  要

NOVELTY - The method comprises adding an elemental sulfur solution in a graphene oxide dispersion to form a mixture or mixed solution, where: elemental sulfur particles are precipitated from a second solvent and attracted to a surface of each graphene sheets to form the sulfur-graphene composite material; the elemental sulfur solution comprises a first solvent and an elemental sulfur dissolved in the first solvent; the graphene dispersion comprises a second solvent and graphene sheets dispersed in the second solvent; and the elemental sulfur is insoluble in the second solvent. USE - The method is useful for making a sulfur-graphene composite material (claimed) that is useful as a cathode active material for lithium-sulfur battery. ADVANTAGE - The method simply and economically makes the sulfur-graphene composite material with good conductivity in an environmental friendly manner thus increasing capacity retention, charge-discharge performance, cycle life, capacity and energy efficiency of the lithium-sulfur battery. DETAILED DESCRIPTION - The method comprises adding an elemental sulfur solution in a graphene oxide dispersion to form a mixture or mixed solution, where: elemental sulfur particles are precipitated from a second solvent and attracted to a surface of each graphene sheets to form the sulfur-graphene composite material; the elemental sulfur solution comprises a first solvent and an elemental sulfur dissolved in the first solvent; the graphene dispersion comprises a second solvent and graphene sheets dispersed in the second solvent; and the elemental sulfur is insoluble in the second solvent, adding a reducing agent to the mixed solution to reduce the graphene oxide sheets to the graphene sheets to form the sulfur-graphene composite material, and separating the sulfur-graphene oxide composite material from the mixture. A concentration of the elemental solution is present 20-80 grams per liter. The graphene sheets are uniformly dispersed in the graphene dispersion, and a mass percentage of the graphene oxide sheets in the graphene oxide dispersion is 1-20 wt %. The method further comprises adding a surfactant in the graphene dispersion before the elemental sulfur solution is added. The elemental sulfur solution is dripped in the graphene dispersion. The sulfur-graphene composite material: is separated by leaching; and is air-dried or freeze-dried material. A diameter of the elemental sulfur particles is present in 20-200 nm. DESCRIPTION OF DRAWING(S) - The figure shows a flow chart of a method for making a sulfur-graphene composite material.