The invention provides a preparation method of a nano sheet MnO2-graphene composite material, which comprises the following steps: adding a manganese nitrate solution in a mixed solution of hydrogen peroxide and alkaline to perform redox reaction, washing and drying to obtain powder, dispersing the powder in an ammonium persulphate solution to treat, and then dispersing in an organic solvent to obtain a nano sheet MnO2 solution; and diluting the nano sheet MnO2 solution, mixing with a dispersion liquid of graphene powder to obtain the nano sheet MnO2-graphene composite material after ultrasonic treatment. According to the nano sheet MnO2-graphene composite material prepared by the method, the nano sheet MnO2 and the graphene are alternatively arranged and uniformly distributed to guarantee the high conductivity of the graphene, and high specific energy can be obtained. The composite material is used as a super capacitor of the positive electrode to realize high specific capacitance, good charging/discharging capacity and circulating performance, and good combination property.

Nano sheet MnO2-graphene composite material, preparation method thereof and super capacitor

The invention relates to a hydrothermal preparation method of a Fe2O3-SnO2/graphene ternary composite nano-material. The graphene ternary composite nano-material with a stable structure is prepared through the one-step hydrothermal method with graphene, iron chloride and stannous chloride as raw materials. A TEM spectrum shows that the prepared composite nano-material is formed by self-assembling sheet iron oxide nano-particles and two-dimensional graphene nano-sheets in a sheet-sheet combination mode, and the combination mode improves the structural stability of a graphene and metal oxide composite nano-material. More importantly, the graphene composite nano-material prepared through the method has potential application prospects in the fields of environment, energy and the like.

Hydrothermal preparation method of Fe2O3-SnO2/graphene ternary composite nano-material

The invention relates to a preparation method for a graphene loaded cobalt nickel phosphide composite material The method includes: dissolving a nickel salt and a cobalt salt in deionized water, putting graphene oxide in deionized water to conduct ultrasonic treatment into a homogeneous solution, mixing the two fully, then transferring the mixture into a polytetrafluoroethylene lining, then adding red phosphorus, finally performing water hydro-thermal treatment, and subjecting the obtained product to vacuum drying, thus obtaining the graphene loaded cobalt nickel phosphide composite material The method provided by the invention has the advantages of environment friendliness, simple and safe operation and the like

Preparation method for graphene loaded cobalt nickel phosphide composite material

The invention discloses a three-dimensional porous lithium ion battery anode material of a graphene composite material and a preparation method of the lithium ion battery anode material. The preparation method of the three-dimensional porous lithium ion battery anode material comprises the following steps: dissolving oxidized graphene, semiconductor nanoparticles and polyvinyl alcohol into water, and mixing the raw materials evenly; carrying out freeze drying on the mixture obtained from the previous step in a mold, and obtaining a solid oxidized graphene/semiconductor nanoparticle/polyvinyl alcohol three-dimensional porous nano-material; carrying out thermal treatment reduction on the product which is obtained from the previous step, restoring the electrical conductivity of the product, and obtaining a high-elasticity solid oxidized graphene/semiconductor nanoparticle/polyvinyl alcohol three-dimensional porous graphene composite material; and cutting the material obtained from the previous step into slices to serve as the anode material assembling battery of a lithium ion battery, and obtaining the three-dimensional porous lithium ion battery anode material of the graphene composite material. According to the three-dimensional porous lithium ion battery anode material disclosed by the invention, the electrical conductivity of the graphene material can be restored; the three-dimensional porous lithium ion battery anode material has a three-dimensional continuous conductive network and the cycling stability; and the mechanical property of the material can be adjusted.

Three-dimensional porous lithium ion battery anode material of graphene composite material and preparation method of three-dimensional porous lithium ion battery anode material

The invention discloses a preparation method of a manganese oxide/graphene nano-composite material, a lithium ion battery negative electrode and a lithium ion battery. The preparation method comprises the steps of: a hydrothermal process, a compounding process and a roasting process. The preparation method provided by the invention enables direct in-situ growth of hydroxyl manganese oxide on a graphene surface, hydroxyl manganese oxide is compounded on graphene to form a three-dimensional reduced graphene oxide composite material with unique appearance and large specific surface area, and after washing, drying and roasting, a colorless linear manganese oxide and three-dimensional reduced graphene oxide composite material can be obtained. The material solves the agglomeration problem of three-dimensional reduced graphene oxide and manganese oxide nanowire, and well solves the poor stability, poor electrical conductivity and other shortcomings in itself, thus reaching the purpose of enhancing battery performance. The material can be applied to a lithium ion battery negative electrode material, and has the advantages of good cyclic stability and high specific energy density, etc.

Preparation method of manganese oxide/graphene nano-composite material, lithium ion battery negative electrode and lithium ion battery

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 preparation method of a positive pole lithium iron phosphate/carbon composite material for a low-temperature battery The preparation method comprises the following steps: by adopting a ferrous compound as a raw material, and weighing the ferrous compound, a lithium compound and a phosphorus compound according to the mole ratio of Fe:Li:P=(098-1):(1-102):1; respectively dissolving or dispersing in deionized water; adding to a liquid-phase reducing agent with moderate volume according to a certain sequence; carrying out reflux reaction at specific temperature; carrying out solid-liquid separation to obtain lithium iron phosphate precursor; then calcining under the protection of inert gas to prepare the LiFePO4/C composite positive pole material Compared with other methods, the preparation method disclosed by the invention has the advantages of simple process equipment, moderation in condition, completeness in precursor crystallization, great shortening of high-temperature calcination time, great reduction of energy consumption, fine lithium iron phosphate particle diameter and more excellent normal-temperature discharge property and low-temperature charge-discharge property

Positive pole lithium iron phosphate/carbon composite material for low-temperature battery and preparation method of composite material

The invention discloses a preparation method of a lithium ion phosphate/carbon composite material for a high-rate-capability lithium ion battery. The preparation method comprises the following steps: analyzing the iron content and the phosphorus content of a precursor ferrous phosphate powder; adding into mixed slurry of a lithium source, a ferrous phosphate precursor and a phosphorus source according to the molar ratio of Li:Fe:P=(1.02-1):(0.98-1):1, adding a proper amount of a liquid phase reducing agent and a conductive additive, performing reflux reaction at the boiling point temperature of the reducing agent, distilling under reduced pressure and recovering a reducing solvent to obtain a lithium ion phosphate precursor; and calcining under the protection of inert gas to obtain a LiFePO4/C composite anode material. Compared with other methods, the preparation method has the advantages of simple flow, short reaction time, simple process equipment, fine synthesis product particles, uniform particle size distribution, good high-rate electrochemical performance and excellent circulating stability, and besides, the discharging specific capacity is up to 100 mAh/g at 10 C,. The synthesis reaction process does not need a high-pressure container and only needs short high-temperature calcining time, so the reducing solvent is easy to recover, energy consumption is greatly reduced; the industrial popularization is facilitated.

Preparation method of lithium ion phosphate/carbon composite material for high-rate-capability lithium ion battery

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

Positive pole lithium iron phosphate/carbon composite material for low-temperature battery and preparation method of composite material

Preparation method of lithium ion phosphate/carbon composite material for high-rate-capability lithium ion battery