Shenzhen Eigen-equation Graphene Technology Co., Ltd.

Other

Shenzhen University

Qianling Zhang

Jianhong Liu

Chuanxin He

Chuhong Liao

Jian Xu

Xiaoming Li

Dayong Gui

Caizhen Zhu

Xiangning Ren

Chao Hu

Hongzhen Zhang

A method of preparing graphene-coated alumina, the method including: (1) preparing a liquid polyacrylonitrile (LPAN) solution, stirring the LPAN solution at between 100 and 200&#xb0; C. to yield a cyclized polyacrylonitrile solution; (2) heating the cyclized LPAN solution at between 200 and 300&#xb0; C. to yield a thermally-oxidized polyacrylonitrile (OPAN) having a ladder structure; (3) mixing the thermally-oxidized polyacrylonitrile with an aluminum compound, to yield a mixture, and adding a solvent to the mixture, uniformly mixing, to yield a polyacrylonitrile-coated aluminum compound; (4) drying the polyacrylonitrile-coated aluminum compound until the solvent is evaporated, to yield a carbonized precursor-coated aluminum compound; and (5) calcining the carbonized precursor-coated aluminum compound in the presence of an inert gas flow, to yield graphene-coated alumina.

Method of preparing graphene-coated alumina and graphene-coated alumina prepared using the method

A method of preparing a copper-based composite conductive powder. The method includes: (1) preparing a liquid polyacrylonitrile (LPAN) solution, stirring the LPAN solution to yield a cyclized polyacrylonitrile solution; (2) heating the cyclized LPAN solution at between 200 and 300&#xb0; C. for between 1 and 10 hrs to yield a thermally-oxidized polyacrylonitrile having a ladder structure; (3) adding the thermally-oxidized polyacrylonitrile and a copper compound to a solvent, and uniformly mixing, to yield a polyacrylonitrile coated copper compound; (4) drying the polyacrylonitrile coated copper compound to yield a carbonized precursor coated copper compound; and (5) calcining the carbonized precursor coated copper compound in the presence of an inert gas flow of between 10 and 500 mL/min for between 6 and 24 hrs at the temperature of between 300 and 1800&#xb0; C.

Method of preparing copper-based composite conductive powder

A method of preparing a graphene material. The method includes: (1) preparing a liquid polyacrylonitrile (LPAN) solution, stirring the LPAN solution to yield a cyclized polyacrylonitrile solution; (2) stirring the cyclized LPAN solution at between 200 and 300&#xb0; C. to yield a thermally-oxidized polyacrylonitrile; (3) grinding and sieving the thermally-oxidized polyacrylonitrile, and drying a resulting product at room temperature, to yield a thermally-oxidized precursor; (4) calcining the thermally-oxidized precursor in the presence of an inert gas flow of between 10 and 500 mL/min for between 1 and 24 hrs at the temperature of between 400 and 1000&#xb0; C., to yield a carbonized precursor; and (5) calcining the carbonized precursor in the presence of an inert gas flow of between 10 and 500 mL/min for between 1 and 10 hrs at the temperature of between 1000 and 3000&#xb0; C., to yield a graphene material.

Graphene material and method of preparing the same

A method of preparing carbon-coated manganous oxide, the method including: (1) preparing a liquid polyacrylonitrile (LPAN) solution as a carbon source, stirring the LPAN solution at between 100 and 200&#xb0; C. to yield a cyclized polyacrylonitrile solution; (2) heating the cyclized LPAN solution at between 200 and 300&#xb0; C. to yield a thermally-oxidized polyacrylonitrile (OPAN) having a ladder structure; (3) mixing the thermally-oxidized polyacrylonitrile with a manganese compound, to yield a mixture, and adding a solvent to the mixture, uniformly mixing, to yield a polyacrylonitrile coated manganese compound; (4) drying the polyacrylonitrile coated manganese compound until the solvent is evaporated completely and the polyacrylonitrile coated on the manganese compound is crosslinked to form a solid, to yield a carbonized precursor coated manganese compound; and (5) calcining the carbonized precursor coated manganese compound in the presence of an inert gas flow, to yield a carbon-coated manganous oxide.

Method of preparing carbon-coated manganous oxide and carbon-coated manganous oxide prepared using the method

A method of preparing carbon-coated cuprous oxide, including: (1) preparing a liquid polyacrylonitrile (LPAN) solution, stirring the LPAN solution to yield a cyclized polyacrylonitrile solution; (2) heating the cyclized LPAN solution to yield a thermally-oxidized polyacrylonitrile (OPAN); (3) mixing the thermally-oxidized polyacrylonitrile with a copper compound to yield a mixture, and adding to the mixture a hydrophilic solvent or a hydrophobic solvent, thus yielding a polyacrylonitrile coated copper compound; (4) drying the polyacrylonitrile coated copper compound in an oven until the solvent is evaporated completely and the polyacrylonitrile coated on the copper compound is crosslinked to form a solid, where yielding a carbonized precursor coated copper compound; and (5) calcining the carbonized precursor coated copper compound in the presence of an inert gas flow of between 10 and 500 mL/min.

Method of preparing carbon-coated cuprous oxide

A method for modifying a positive electrode material for a lithium-ion battery. The method includes: a) grinding a mixture of manganese dioxide and lithium carbonate, and calcining the mixture at no less than a temperature of 600&#xb0; C. for no less than 20 hrs in the presence of air, to yield a powdery lithium manganese oxide (LiMnO); b) adding a precursor for forming a graphene-like structure to the powdery LiMnO, mixing, curing at a constant temperature of no less than 180&#xb0; C. for between 2 and 4 hrs, grinding, and calcining at no less than a temperature of 500&#xb0; C. for between 1 and 50 hrs in the presence of an inert gas, to yield a composite powder comprising a graphene-like structure and LiMnO; and c) collecting and sintering the composite powder at a temperature of between 300 and 500&#xb0; C. for between 1 and 10 hrs in the presence of air.

Positive electrode materials for lithium-ion batteries and method for preparing the same

A method for modifying a positive electrode material for a lithium-ion battery. The method includes: a) stirring a liquid polyacrylonitrile (LPAN) solution at the temperature of between 80 and 300&#xb0; C. for between 8 and 72 h to yield a cyclized LPAN solution; b) adding positive electrode material for a lithium-ion battery, in a powder form, to the cyclized LPAN solution, and evenly mixing a resulting mixture; c) grinding the mixture, and drying the mixture at room temperature; and d) calcining the mixture at the temperature of between 500 and 1800&#xb0; C. for between 6 and 24 h in the presence of an inert gas to form a graphene-like structure by the cyclized LPAN. The graphene-like structure is evenly distributed in the positive electrode material of the lithium-ion battery to yield a graphene-like structure modified positive electrode material of the lithium-ion battery.

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Shenzhen, China

Qianling Zhang