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7866 results about "Carbon source" patented technology

A carbon source is anything that gives out carbon. For example, burning fossil fuels is a carbon source. The burning releases carbon, which joins with oxygen to become CO2.

Comprehensive recovering method of waste lithium iron phosphate battery

The invention provides a comprehensive recovering method of waste lithium iron phosphate batteries, which has simple and reasonable process, low recovering cost and high added value. The method comprises the following steps: utilizing an organic solvent to dissolve an adhesive on battery cell fragments, and realizing the separation of lithium iron phosphate material and clean aluminum and copper foils through screening, wherein the aluminum and copper foils are recovered by smelting; utilizing a NaOH solution to remove residual aluminum foil scraps in the lithium iron phosphate material, and removing graphite and remaining adhesive by heat treatment; after dissolving the lithium iron phosphate with acid, utilizing sodium sulphide to remove copper ions, and utilizing the NaOH solution or ammonia solution to allow iron, lithium and phosphorus ions in the solution to generate sediments; adding iron source, lithium source or phosphorus source compounds to adjust the molar ratio of iron, lithium and phosphorus; and finally adding a carbon source, and obtaining a lithium iron phosphate cathode material through ball milling and calcination in inert atmosphere. After the treatment of the steps, the recovery rate of valuable metals in the batteries is more than 95%, and the comprehensive recovery rate of the lithium iron phosphate cathode material is more than 90%.

Method for producing carbon coated nano stage lithium iron phosphate by precipitation

The invention discloses a precipitation method for preparing nanometer level iron phosphate lithium coated with carbon. The method comprises the following steps: firstly, weighing iron salt, deionized water and a compound of metallic elements; after the stirring and the mixing are performed, adding a phosphorous compound and citric acid diluted with water to the mixture; after the stirring is performed again, adding a precipitation agent to the mixture and controlling to the neutrality; stirring to react in a container, and after the static placement, respectively adding the deionized water, a carbon source and lithium salt to mix uniformly after the precipitate is filtered and washed; stirring again to react, and drying the water at 30 to 160 DEG C and warming up at the heating rate under the protection of non-oxidized gas after a product is crashed; baking at a constant temperature of 450 to 850 DEG C, cooling down to a room temperature at a cooling rate or with a stove, and finally obtaining the nanometer level ferric phosphate lithium coated with the carbon after crashing is performed. The precipitation method has the advantage that the raw material cost and the processing cost are low because bivalent iron is taken as the raw material. The iron phosphate lithium prepared by using the process has the characteristics of good physical processing performance and good electrochemistry performance, and is suitable for industrialized production.

Graphene foam with three dimensional fully connected network and macroscopic quantity preparation method thereof

ActiveCN102674321AEnables macro-preparationLow densityGrapheneGas phaseReplication method
The invention relates to a graphene-based novel material and a chemical vapor deposition preparation technology thereof, in particular to graphene foam with a three dimensional fully connected network and a macroscopic quantity preparation method thereof. The method is suitable for a mass preparation of the graphene foam with high qualities. Three dimensional connected graphene can grow by catalytic cracking of carbon source gases on the surface of a three dimensional porous metal through the chemical vapor deposition technology, and a porous foam-shaped graphene three dimensional macroscopic body can be obtained after a porous metal base is removed by dissolving subsequently. According to the graphene foam with the three dimensional fully connected network and the macroscopic quantity preparation method thereof, a simple template replication method is used for preparing the three dimensional connected graphene macroscopic body, and the method has the advantages that the operation is simple and convenient, the rate of production is high, and the adjustment and control of the structure are easy. The graphene foam forms the fully connected network in a seamless connection mode, has a low density, a high porosity and specific surface area and excellent capabilities of charge conduction and heat conduction and establishes a foundation for applications of graphene in fields of electric conduction, thermally conductive composite materials, electromagnetic shielding, wave absorbing, catalysis, sensing and energy storage materials and the like.

Method for preparing nanometer ferrous phosphate lithium /carbon composite material

The invention belongs to energy materials, particularly relating to a method for preparing nanometer ferrous phosphate lithium /carbon composite material. In the invention, ferrous source, lithium source, phosphorus source are mixed with a small quantity of doped metal salt and organic macromolecular polymer carbon source according to certain ratio followed by the steps of ball milling, parching and calcining. High temperature sintering is carried out on the above mixture in the atmosphere of non-oxidation gas to obtain nanometer lithium iron phosphate LiMxFe(1-x)PO4/C coated with carbon and LiFe(1-x)NxPO4/C material, and the particle sizes of which are remarkably reduced and are less than 100nm. When the material is applied to battery assemble, 0.2C multiplying power discharge capacity can reach above 160mAh/g at room temperature, 1C multiplying power discharge capacity can be 140-155mAh/g, and 5C multiplying power discharge capacity is 130-150mAh/g. the initial capacity is 120-140mAh/g under the large multiplying power of 10C, and remains more than 90% through thousands of cycles, demonstrating good multiplying power and cycle properties. The invention features low cost, simple production process and fine safety. The prepared nanometer ferrous phosphate lithium /carbon composite material can be widely applied into manufacturing of convenient and fast equipment, electric vehicles and the like.

Preparation method of monodisperse lithium iron phosphate nanometer material and lithium-ion secondary battery

The invention relates to a preparation method of a monodisperse lithium iron phosphate nanometer material, which is characterized by comprising the following steps of: dissolving a soluble lithium source compound, a ferrous source compound, a phosphorus source compound, a dopping element compound, a carbon source compound, and the like into water or a mixed solvent of the water and an organic solvent; sequentially adding to the organic solvent for stirring and mixing according to specific material mole ratio and order, and keeping the volume ratio of the organic solvent to the water to be within a certain range; transferring a mixture to a high-pressure reaction still for heating treatment; and processing a product through a plurality of steps of washing, drying, carbon coating, ball-milling, mixing, annealing, and the like to obtain the lithium iron phosphate anode active material which has high multiplying power circulation and property. The invention also discloses a relevant lithium-ion secondary battery. By adopting a hydrothermal/solvothermal method and using soluble materials as reactants, the invention enables ions to be uniformly mixed in the synthesizing process, thereby obtaining better crystal forms and very pure phases and further enhancing the property of batteries.
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