41results about How to "Excellent electrochemical lithium storage performance" patented technology

The invention discloses a graphene / nickel sulphide nano composite electrode material and a preparation method thereof. The graphene / nickel sulphide nano composite electrode material is prepared under the crosslinked action of graphene with graphene oxide as a carrier, nickel acetate as a nickel source and carbon disulphide as a sulphur source. The graphene / nickel sulphide nano composite electrode material comprises graphene nanosheets and nickel sulphide flower-type submicrostructure ingredients in a mass ratio of (5-35%): (95-65%). The preparation method of the graphene / nickel sulphide nano composite electrode material has the advantages that graphene oxide, nickel acetate and carbon disulphide are taken as raw materials and the graphene / nickel sulphide nano composite electrode material is obtained by adopting a one-pot solvothermal method in an organic solvent, and the graphene / nickel sulphide nano composite electrode material has good electrochemical lithium storage property and can serve as a cathode material for a lithium ion battery.

The invention discloses a nano silicon and silicon / carbon composite material based on cut silicon waste and a preparation method and application thereof. The preparation method of the nano silicon comprises the following steps: mixing the cut silicon waste and metal magnesium powder, performing tabletting, performing wrapping with foamed nickel, and binding the mixture on a metal molybdenum rod current collector by using a fine molybdenum wire to serve as an anode; connecting the metal molybdenum rod with a stainless steel current collector to serve as a cathode; taking magnesium salt as molten salt; and performing soaking and alloying for 0.5-3 hours in the molten magnesium salt, applying a voltage of 1-2 V to the soaked and alloyed anode and cathode, carrying out constant-current electrolysis for 2-12 hours, taking out the anode and cathode, performing cooling, cleaning, pickling and drying to obtain the nano silicon; mixing carbon precursors and nano-silicon, and performing ultrasonic dispersion and hydrothermal-in-situ polymerization and pyrolysis carbonization to obtain a silicon / carbon composite material. The nano-silicon and silicon / carbon composite material prepared by the method shows good discharge specific capacity, rate capability and cycling stability, and the method has the advantages of rich raw materials, low cost, simple operation process and the like.

The invention discloses a phosphorus-doped bronze ore phase titanium dioxide nanowire array and preparation and application thereof. A specific preparation method comprises the steps: a titanium sheetis placed into a sodium hydroxide solution to be subjected to a hydrothermal reaction, then the titanium sheet is soaked in a hydrochloric acid solution, and drying is conducted after washing; and then the titanium sheet and sodium hypophosphite are placed into a tubular furnace, protective gas is introduced, thus the sodium hypophosphite and the titanium sheet are located in the upstream and thedownstream of airflow correspondingly, heating is conducted to 300-500 DEG C, heat preservation is conducted, and the phosphorus-doped bronze ore phase titanium dioxide nanowire array can be obtainedon the titanium sheet. By doping an phosphorus element into the phosphorus-doped bronze ore phase titanium dioxide nanowire array, designing the overall process of the preparation method, and improving parameter conditions of the key hydrothermal reaction and a heat treatment process, the electrochemical lithium storage capacity of the bronze ore phase titanium dioxide nanowire array is effectively enhanced, and a self-supporting lithium-ion battery anode which contains no binder and conductive agent and has the excellent electrochemical properties can be obtained.

The invention discloses a preparation method of a graphene / metal carbide porous micro-sphere electrode, and relates to a preparation method of a hierarchically structured three-dimensional composite material. The invention aims to solve the problems of battery performance degradation and cycling stability influence caused by volume expansion of an existing anode material. The method comprises the following steps: firstly, preparation of oxidized graphene; secondly, preparation of a mixed solution; thirdly, drying; fourthly, annealing treatment to obtain the graphene / metal carbide porous micro-sphere electrode. The graphene / metal carbide porous micro-sphere electrode prepared in the invention as a lithium ion battery anode material has good electrochemical lithium storage performance, the capacity of a battery prepared by using the graphene / metal carbide porous micro-sphere electrode as the battery anode material under the current density of 0.1 A / g is greater than 500 mAh / g, the capacity of the battery under the current density of 3 A / g is greater than 300 mAh / g, and the capacity is hardly attenuated after 500 times of circulation. The preparation method is suitable for preparing the graphene / metal carbide porous micro-sphere electrode.

The invention discloses a graphene / nickel sulfide nano composite electrode material and a preparation method thereof. With graphene oxide as a carrier, nickel acetate providing a nickel source and carbon disulfide providing a sulfur source, the electrode material is prepared under the crosslinking effect of the graphene; the nano composite material comprises a graphene nanosheet and a nickel sulfide flower-like submicrostructure component in a weight ratio of (5 to 35%):(95 to 65%). In the invention, the graphene / nickel sulfide nano composite material is prepared from the raw materials graphene oxide, nickel acetate and carbon disulfide, by a one-pot solvothermal process in an organic solvent; the nano composite material has good electrochemical lithium storage property and can be used asa cathode material of a lithium ion battery.

The invention discloses a CuCo-BDC ultrathin nanosheet, a preparation method and application thereof. The preparation method comprises the following steps: dissolving copper chloride dihydrate, cobalt chloride hexahydrate and terephthalic acid in a mixed solution of N, N-dimethylformamide, ethanol and deionized water in an ultrasonic manner; and stirring the solution obtained in the previous step, adding triethylamine in a stirring state, then putting the solution into an ultrasonic machine for ultrasonic treatment, then centrifuging, cleaning the product obtained after centrifuging with ethanol multiple times, and drying to obtain Cu / Co-BDC powder, namely the CuCo-BDC ultrathin nanosheet. According to the invention, the Cu / Co-BDC ultrathin nanosheet with the optimal performance is obtained by regulating and controlling the proportion of metal elements, and then the Cu / Co-BDC ultrathin nanosheet is directly used as a lithium ion battery negative electrode material, wherein the average discharge potential of the material is improved by doping Cu<2+> ions, the Cu<2+> ions and Co<2+> form a bimetal organic framework, and the electrochemical lithium storage performance of the material is further improved through the coordination effect of bimetal ions.

The invention discloses a preparation method of SnS2 nanoplate anode material of a lithium-ion battery, comprising the following steps: dissolving L-cysteine in deionized water, then adding stannic chloride and fully stirring the solution to dissolve the stannic chloride; transferring the mixed solution in a reaction kettle with a polytetrafluoroethylene tank to react hydrothermal reaction at 180-220 DEG C for 8-12h, then cooling to the room temperature, centrifugalizing the products to obtain precipitate, cleaning and drying the precipitate fully to obtain the SnS2 nanoplate anode material of a lithium-ion battery; wherein, the molar ratio of L-cysteine to stannic chloride is 4:1-8:1. The SnS2 nanoplate anode material of a lithium-ion battery prepared by the method of the invention has high electrochemical capacity and good cyclic stability.

The invention belongs to the technical field of preparation of nano composite materials, and relates to a preparation method of a nano germanium / three-dimensional porous graphene composite material. The preparation method comprises the following steps: preparing a graphene oxide dispersion liquid; then preparing a cationic polyelectrolyte modified polystyrene microsphere dispersion liquid; slowly adding polyvinylpyrrolidone and germanium dioxide into a sodium hydroxide solution, then adding the mixed solution into a cationic polyelectrolyte modified polystyrene microsphere dispersion liquid, then adding a graphene oxide dispersion liquid, adjusting the pH value with hydrochloric acid, dropwise adding into a sodium borohydride solution, precipitating and centrifuging, and drying to obtain the cationic polyelectrolyte modified polystyrene microspheres. And heating in inert / reducing mixed gas at 600-800 DEG C for 4-8 hours to obtain the catalyst. The nano germanium / three-dimensional porous graphene composite material is prepared by combining template-assisted thermal reduction with a freeze-drying method, the operation process is simple and easy to implement, the reaction time is short, the method is environmentally friendly and safe, the cost is low, and industrial implementation is easy. The prepared composite material has excellent lithium storage performance and is expected to be used as a negative electrode material of a lithium ion battery.

The invention discloses a thermal-assisted preparation method of a solvent of a LiFePO4@C / rGO (reduced graphene oxide) multi-stage composite microsphere, which belongs to the technical field of electrochemical energy storage materials. In the thermal-assisted preparation method, Fe<3+> salt serves as an iron source, and a LiFePO4OH multi-stage composite microsphere LiFePO4OH@RF / GO modified by RF (resorcinol-formaldehyde resin) and GO (formaldehyde resin) is prepared in situ synthesis by a one-step mixed solvent-thermal method. The composite microsphere is further translated into a LiFePO4 / C multi-stage composite microsphere LiFePO4@C / rGO modified by rGO by high-temperature carbon thermal reduction treatment under an effect of protecting gas, the tap density is 1.3g / cm<3>; due to nanoscale primary particles, the sufficient activity contact area with an electrode / electrolyte is ensured; in addition, due to the loaded large-area rGO nanosheets, the electronic conductivity inside the microsphere or between every two adjacent microspheres is greatly improved; therefore, the material has excellent electrochemical lithium storage performance, so that the material has the potential application prospect in high-energy / power lithium-ion batteries.

The invention discloses a carbon-assembled zinc sulfide hollow nano-polyhedron honeycomb material. The zinc sulfide hollow nano-polyhedron is assembled into a three-dimensional honeycomb structure through carbon, and the carbon is amorphous carbon formed by carbonization of polyvinylpyrrolidone. The invention also discloses a method for preparing the carbon-assembled zinc sulfide hollow nano-polyhedral honeycomb material. First, the zinc MOF material ZIF-8 is synthesized, and then ZIF-8 is densely assembled with polyvinylpyrrolidone, and then through one-step gas phase vulcanization and carbonization method to obtain the final product. The invention can improve the electrical conductivity, structural stability and cycle stability of the zinc sulfide, so that the zinc sulfide has high specific capacity and stable cycle performance. Carbon-assembled zinc sulfide hollow nanopolyhedral honeycomb materials have important application value as anode materials for lithium-ion batteries.

The invention relates to a preparation process of a flexible electrode with long cycle life and high specific capacity, which comprises the following steps: (1) acid treatment of multi-walled carbon nanotubes; (2) preparation of the electrode: manganese source and The treated multi-walled carbon nanotubes are mixed and dispersed in the solution according to a predetermined ratio, and the manganese ions in the manganese source are adsorbed on the multi-walled carbon nanotubes through electrostatic interaction at a predetermined temperature, and then carbonate solution is added for a predetermined time of reaction Generate manganese carbonate anchored on the multi-walled carbon nanotubes, and then perform vacuum filtration and drying to form a flexible film. Finally, the flexible film is reacted at a predetermined temperature and an inert gas atmosphere for a predetermined time to decompose the manganese carbonate to form manganese oxide. The preparation method of the present invention is simple and easy, the raw materials used are low in price, and the prepared product has good flexibility and high active material content, and when used as a flexible negative electrode of a lithium battery, it exhibits long cycle life and high specific capacity.

The invention belongs to the field of lithium battery electrode materials and in particular relates to a preparation method of nano-V2O5. The invention aims to provide the preparation method of the nano-V2O5; the preparation method comprises the following steps: uniformly stirring and mixing a vanadium-containing substance, a chelate compound and a surfactant to prepare a precursor solution; enabling the precursor solution to react under a room-temperature or heating condition; separating out sediment; filtering to obtain a solid; washing and drying the solid to obtain the nano-V2O5. The method provided by the invention is simple to operate and the nano-grade V2O5 can be prepared.

The invention discloses a carbon-assembled copper sulfide hollow nano-cube honeycomb material. The copper sulfide hollow nano-cube is assembled into a three-dimensional honeycomb structure through carbon, and the carbon is amorphous carbon formed by carbonization of polyvinylpyrrolidone. The invention also discloses a method for preparing the carbon-assembled copper sulfide hollow nano-cube honeycomb material, first synthesizing cuprous oxide cubes, then forming copper sulfide hollow nano-cubes by vulcanization and etching, and then obtaining by polyvinylpyrrolidone assembly and carbonization . The invention can improve the electrical conductivity and structural stability of copper sulfide, and further improve its electrochemical activity and cycle stability, so that it has higher charge and discharge capacity and better cycle performance. Carbon-assembled copper sulfide hollow nanocube honeycomb materials have important application value as anode materials for lithium-ion batteries.

The invention discloses a method for preparing NiCo-BTC nanosheets induced by amorphous metal oxides and its application. Cobalt nitrate, nickel nitrate, sodium borohydride, etc. are used as raw materials to prepare amorphous metal oxide nanosheet powder (NiCo BTC ‑ONs), and then dispersed in N, N‑dimethylformamide, and adding a mixed solution of trimesic acid and N, N‑dimethylformamide, through centrifugation, ethanol washing, drying and other steps, and finally Metal-organic framework (MOF) NiCo‑BTC nanosheet powder was prepared. The invention relates to a method for preparing metal-organic framework NiCo-BTC nanosheets. The prepared metal-organic framework nanosheets can be directly used as negative electrode materials for high-performance lithium-ion batteries. The preparation method is mild, safe and pollution-free, and simple and easy to operate. The cost is low, which is conducive to further improving the electrochemical lithium storage performance of the material.