The invention discloses a preparation method of a hollow nickel cobaltate nano polyhedron The method comprises the following steps: (1) mixing an organic metal framework complex ZIF-67 and an alcoholic solution of nickel nitrate uniformly, and reacting at the temperature condition of 80-100 DEG C; (2) cooling to room temperature after reaction, collecting precipitate, cleaning by ethyl alcohol or other non-polar solvents, centrifuging, removing the solvents, and carrying out vacuum drying so as to obtain a hollow nickel cobalt hydroxide polyhedron; and (3) annealing the hollow nickel cobalt hydroxide polyhedron in air heating so as to obtain the porous nickel cobaltate nano hollow polyhedron The method is simple to operate, and is environmentally friendly, and the mold plate removing process is omitted; the hollow obtained nickel cobaltate nano polyhedron has the relatively high specific surface area, relatively low mass transfer resistance and relatively excellent structure stability; as an electrode material of the lithium ion battery, the hollow nickel cobaltate nano polyhedron is superior to an existing transition metal oxide electrode material in cost and performance

Preparation method of hollow nickel cobaltate nano polyhedron

The invention discloses a surface modified porous carbon structural carbon fiber/sulfur composite cathode material and a preparation method thereof The composite cathode material is formed by compounding surface modified porous carbon structural carbon fiber and elemental sulfur The preparation method comprises the steps: firstly, preparing an organic metal frame coated carbon fiber composite by using a solvothermal method; carbonizing the composite at high temperature; and then, compounding the composite with sulfur to obtain the surface modified porous carbon structural carbon fiber/sulfur composite cathode material The preparation method is simple; the adopted raw materials are low in cost; the prepared composite cathode material has high specific capacity and high utilization ratio of active sulfur; the cycle performance of a lithium sulfur battery is greatly improved

Surface modified porous carbon structural carbon fiber/sulfur composite cathode material and preparation method thereof

The invention discloses a dye/metal-organic framework composite material for white light emission. The dye/metal-organic framework composite material for white light emission is composed of 70-90% of indium-containing metal-organic framework, 5-15% of pyridine hemicyanine dye and 5-15% of acridine dye by molar percent. The preparation method comprises the steps of: firstly, synthesizing the indium-containing metal-organic framework from a benzene polycarboxylic acid organic ligand and an indium salt through a solvothermal reaction, and secondly, introducing the pyridine hemicyanine dye and the acridine dye into the indium-containing metal-organic framework by the ion exchange method to obtain the dye/metal-organic framework composite material. The synthetic method is simple in process and mild in conditions; the raw materials are easy to get and the yield of the dye/metal-organic framework composite material is high; the prepared dye/metal-organic framework composite material is high in chemical stability; the chromaticity coordinates of the emitted color are quite close to the chromaticity coordinates of the ideal white light; the color rendering index of the composite material is higher than 80 and the luminous quantum efficiency of the composite material is greater than 20%; therefore, the dye/metal-organic framework composite material for white light emission is expected to be applied to the fields of display and light emitting devices and the like as a novel white light emitting material.

Dye/metal-organic framework composite material for white light emission and preparation method thereof

The invention discloses graphene activated metal organic framework electrode material and preparation and applications thereof The preparation method comprises the steps that soluble salt containing metal ions and organic ligands are added in a solvent, and reaction temperature is controlled within 100 DEG C-150 DEG C and maintained for 24h-30h so that MOF structural material is obtained; and the MOF structural material is ultrasonically dispersed in the solvent and then graphene is added, and reaction is performed for 10-60min so that the graphene activated MOF electrode material is prepared The metal organic framework material has the advantages of being porous, high in specific surface area, adjustable in structure and diverse in structure and is simple in the material preparation process; and the metal organic framework material has excellent cyclic stability and high specific discharge capacity when the metal organic framework material is applied to superconductor electrode material, and specific capacitance is 280F/g and thus stability is great

Graphene activated metal organic framework electrode material and preparation and applications thereof

The invention relates to a metal organic frame Uio-66@S lithium-sulfur positive electrode material and a preparation method, and belongs to the technical field of lithium-sulfur batteries. The metal organic frame Uio-66@S lithium-sulfur positive electrode material is formed by mixing a metal-organic frame Uio-66@S composite material with a conductive agent and an adhesive; the metal-organic frame Uio-66@S composite material is formed by mixing a metal-organic frame material generated by a metal salt and terephthalic acid with sulfur and performing ball milling; and the preparation method is as follows: 1) synthesizing the metal-organic frame material Uio-66@S: taking the metal salt, and reacting with the terephthalic acid to generate the metal-organic frame material; 2) forming the Uio-66@S composite material: mixing with the sulfur and performing the ball milling uniformly, and forming the Uio-66@S composite material by employing a melting method; and 3) preparing the electrode material: stirring with the conductive agent and the adhesive in a solvent uniformly to form a slurry, coating on a current collector, drying and cutting into pieces. The metal organic frame Uio-66@S lithium-sulfur positive electrode material related by the invention has the advantages of extremely high specific surface area, rich mesoporous channels, simple preparation process, low cost, and capability of large-scale production, etc.

Metal organic frame Uio-66@S lithium-sulfur positive electrode material and preparation method

The present invention discloses a preparation method for a lithium-sulfur battery positive electrode material adopting a metal-organic framework material as a sulfur carrier. According to the present invention, heating is adopted to melt sulfur, such that sulfur molecules enter an activated metal-organic framework material, and are subjected to composite interaction with the material; and then the sulfur-metal-organic framework composite material, a binder and a conductive agent are mixed to prepare the lithium-sulfur battery positive electrode material. According to the prepared lithium-sulfur battery positive electrode material, high porosity and a binding effect of a unique micropore structure on sulfur molecules and polysulfides of the metal-organic framework material are adopted so as to reduce sulfur content reduction in a reaction system during a circulation process and effectively improve a cycle performance of the lithium-sulfur battery.

Preparation method for lithium-sulfur battery positive electrode material adopting metal-organic framework material as sulfur carrier

The invention discloses a preparation method for a lithium ion battery from an electrode material with a core-shell structure. The preparation method comprises the following steps: cladding titanium dioxide on the surface of a metal-organic framework material by using different precursors under different conditions; performing two-step calcining on the metal-organic framework material to form the core-shell structure of oxide cladded by the titanium dioxide; then mixing the core-shell material with a binder and a conductive agent to obtain the electrode material of the lithium ion battery. According to the electrode material of the lithium ion battery, prepared by the preparation method disclosed by the invention, the metal-organic framework material is used as a template; the metal-organic framework material is converted into metal oxide through calcining and a porous structure of the metal-organic framework material is retained; the metal-organic framework material is coated with the titanium dioxide to form the core-shell structure, so that the dissolution of metal elements in the cycle process of the battery is reduced; besides, the problem about structural damage caused by lithium insertion is relieved, so that the cycle performance of the lithium ion battery is improved.

Preparation method for lithium ion battery from electrode material with core-shell structure

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Preparation method for lithium-sulfur battery positive electrode material adopting metal-organic framework material as sulfur carrier

Preparation method for lithium ion battery from electrode material with core-shell structure