The invention discloses a method for compounding graphene and a metallic oxide/metallic compound. The method comprises the following steps: a, dissolving graphene oxide in a dispersing agent, regulating the PH value of the solution to be 5-9, and preparing a graphene oxide solution; and b, adding the oxide/metallic compound into the graphene oxide solution, ultrasonically mixing, reacting at the temperature of 70-120 DEG C for 32-40 hours. According to the method for compounding graphene and the metallic oxide/metallic compound, a reducing agent is not used, the composite material is reduced by utilizing the reducing property of graphene oxide in a hydrothermal environment, and the final product forms the uniformly dispersed graphene and oxide/metallic compound composite material by utilizing the high water solubility of the graphene oxide; and moreover, according to the material, the cycle performance, rate capability and gram volume of the oxide which serves as an electrode of a lithium ion battery can be effectively improved, and the impendence is reduced.

Method for compounding graphene and metallic oxide/metallic compound and composite material thereof

The invention discloses a stannic oxide/graphene/carbon composite material and a preparation method thereof, and belongs to the fields of electrochemistry and new energy materials. The method comprises the following steps: oxidizing graphite into a graphite oxide with an oxidant in preparation and then ultrasonically stripping the graphite oxide into a graphite oxide material; mixing a tin source and an organic carbon source with a graphite oxide solution evenly according to different ratios, and preparing a stannic oxide/graphene/carbon liquid gel composite material from the mixed solution through hydrothermal reaction, wherein the hydrothermal reaction temperature is 120-250 DEG C; and the hydrothermal reaction time is 1-48 hours; and carrying out freeze drying and heating treatment on the prepared stannic oxide/graphene/carbon liquid gel composite material to obtain a three-dimensional stannic oxide/graphene/carbon foam composite material. The material disclosed by the invention has good flexibility, is suitable for manufacturing of a flexible electrode, does not need to be added with any assistant when taken as an anode material for a lithium-ion battery, does not need to utilize a metal substrate and demonstrates good cycling stability and relatively high specific capacity.

Stannic oxide/graphene/carbon composite material and preparation method thereof

The invention discloses a preparation method and an application of a graphene-based stannic oxide composite material with a three-dimensional structure. The preparation method disclosed by the invention is characterized in that graphene with a single-layer carbon atomic structure is used as a carrier, stannic chloride pentahydrate is used as a tin source precursor, and the graphene-based stannic oxide composite material with the three-dimensional structure is prepared through a hydrothermal freeze-dried method. The stannic oxide nanometer particles obtained by the method are uniformly loaded on a graphene skeleton to be assembled into aerogel with the three-dimensional structure very well. The electrochemical test proves that the graphene-based stannic oxide composite material with the three-dimensional structure obtained by the preparation method has excellent circulation stability and rate capability. Experiments prove that the discharge capacity of the stannic oxide material can reach 800mAh.g in 100mAh.g charge-discharge currents.

Preparation method and application of three-dimensional graphene-based stannic oxide composite material

The invention discloses a graphene-based composite lithium ion battery film cathode material and a preparation method thereof Currently, commercial lithium ion battery cathode materials have problems such as low specific capacity and insufficient organic solvent co-intercalation According to the invention, an electrostatic spraying deposition apparatus is adopted; graphene and stannous nitrate are mixed, and the mixture is dissolved in a solvent of ethanol, ethylene glycol and 1,2-propylene glycol through ultrasonic dispersion, such that a metal cation precursor solution with a concentration of 0005mol*L to 002mol*L is formed; the solution is delivered to a spraying nozzle with a uniform speed; a distance between a pinhead to a substrate is adjusted; the substrate is heated; a direct current high voltage between the spraying nozzle and the substrate is adjusted, such that stable and uniform aerosol spray is obtained; graphene and stannous nitrate form a three-dimensional network structure on the substrate material with a direct chemical bonding manner or a mechanical mixing manner The film can be used as a lithium ion battery cathode The film has high first-time coulombic efficiency, excellent electrochemical lithium storing performance, and excellent cyclic performance

Graphene-based composite lithium ion battery film cathode material and preparation method thereof

The invention provides a lithium ion battery negative electrode material which has a layer structure which comprises a surface layer, a bottom layer and an interlayer, wherein the surface layer is a titanium dioxide layer, the bottom layer is graphene, the interlayer is clamped between the surface layer and the bottom layer and is composed of tin dioxide. The invention provides a preparation method of the lithium ion battery negative electrode material, and the preparation method comprises the following steps: mixing a titanium compound, a tin inorganic substance, glacial acetic acid and ethyl alcohol so as to obtain a first mixture; mixing oxalic acid and a graphene oxide aqueous solution so as to obtain a second mixture; mixing the first mixture and the second mixture, performing heat preservation, and then aging, thereby obtaining a precipitate; annealing the precipitate so as to obtain the lithium ion battery negative electrode material. The lithium ion battery negative electrode material provided by the invention has batter cycle performance, and the preparation method is simple in process and suitable for industrial production. The invention further provides a lithium ion battery.

Lithium ion battery negative electrode material and preparation method thereof, as well as lithium ion battery

The invention provides a preparation method of a stannic oxide and grapheme lamella composite material. The preparation method comprises the following steps of mixing at least one organic solvents, graphene oxide lamella hydrosol and at least one tin salt, heating the mixture at a temperature of 60 to 200 DEG C for 0.5 to 12 hours to obtain a solid substance, and heating the solid substance in the inert gas atmosphere at a temperature of 400 to 700 DEG C for 0.5 to 10 hours. The invention also provides a preparation method of a metallic tin and grapheme lamella composite material. The preparation method comprises the following step of preparing a stannic oxide and grapheme lamella composite material through the preparation method of a stannic oxide and grapheme lamella composite material, and heating the prepared stannic oxide and grapheme lamella composite material in the reducing gas atmosphere at a temperature of 400 to 1000 DEG C for 0.5 to 4 hours. The preparation methods of the invention can improve a structural stability and an electrochemical performance of a material and is beneficial to improve a high-speed charging and discharging performance and a conductivity of a composite material. The preparation methods have the characteristics of cheap and easily available raw materials, simple process, and good applicability for industrial continuous production.

Preparation method of stannic oxide or metallic tin and grapheme lamella composite material

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Preparation method of stannic oxide or metallic tin and grapheme lamella composite material