Preparation method of nitrogen-doped carbon material
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A nitrogen-doped carbon and carbon material technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as difficulty in meeting the needs of high-capacity lithium-ion battery anode materials, reduce production costs, alleviate volume expansion, The effect of simple heat treatment process
Inactive Publication Date: 2014-04-16
JILIN UNIV
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Problems solved by technology
At present, the negative electrode materials for commercial applications are mainly graphitized carbon materials, but the theoretical capacity of carbon materials is only 372mAh / g. Demand for anode materials
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Embodiment 1
[0024] (1) Stir the egg white liquid for 24 hours for homogenization, then filter to remove impurities, add 40 grams of egg white liquid to 30 ml of deionized water and stir to mix evenly;
[0025] (2) Heat the egg white solution in the steam of boiling water to denature and shrink the egg white molecules to form a colloid similar to a chicken cake;
[0026] (3) Nitrogen-doped amorphous carbon can be obtained by calcining at 500°C for 3 hours under the protection of nitrogen;
Embodiment 2
[0028] (1) Take the egg white liquid and stir for 12 hours for homogenization, then filter to remove impurities, add 20 grams of egg white liquid to 20 ml of deionized water and mix well;
[0029] (2) Add 0.5 g of tin dioxide to the egg white solution, stir for 1 hour and then sonicate until uniformly dispersed;
[0030] (3) Heating the suspension in the steam of boiling water to denature and shrink the egg white molecules to form a colloid similar to a chicken cake;
[0031] (4) After centrifugation, washing and drying, the nitrogen-doped carbon-coated tin dioxide composite material can be obtained by calcining at 500°C for 6 hours under an inert atmosphere;
Embodiment 3
[0033] (1) Stir the egg white liquid for 48 hours for homogenization, then filter to remove impurities, dissolve 30 grams of egg white liquid into 30 ml of deionized water and mix well;
[0034] (2) Add 1 gram of glucose and 0.5 gram of tin dioxide to the egg white solution, stir for 1 hour and then sonicate until evenly dispersed;
[0035] (3) Heating the suspension in the steam of boiling water to denature and shrink the egg white molecules to form a colloid similar to a chicken cake;
[0036] (4) After drying, the nitrogen-doped carbon-coated tin dioxide composite material can be obtained by calcining at 600°C for 6 hours under an inert atmosphere;
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Abstract
The invention discloses a preparation method of a nitrogen-doped carbon material. The carbon material has a mesoporous structure and is doped with nitrogen, and the doping content of the nitrogen in the carbon material is controllable; a composite of the carbon material is modified by the carbon material; and the preparation method selects egg white as a raw material to form the nitrogen-doped carbon material through high-temperature calcination and carbonization in the inert atmosphere, and comprises steps as follows: (1), an egg white solution is taken as a solvent for material composition; (2), the egg white is steamed in boiling water and forms tin dioxide jelly similar to yellow cake; and (3), calcination is performed in the inert atmosphere to obtain the nitrogen-doped carbon material. with the adoption of the method, the nitrogen-doped carbon composite material with a carbon coating structure can be prepared, and the content of the nitrogen in the carbon material is controllable; and the prepared nitrogen-doped carbon composite material is suitable for being taken as a Li-ion electrode material, and is simultaneously applicable to the fields of corrosion resistance, gas absorption and the like.
Description
technical field [0001] The invention relates to a method for preparing an inorganic functional material, in particular to a method for preparing a nitrogen-containing carbon material by high-temperature calcination under an inert atmosphere, and belongs to the technical field of inorganic advanced nanometer material preparation technology. Background technique [0002] Lithium-ion batteries have many advantages such as high voltage, large specific capacity, stable discharge voltage and high safety, and have become one of the hot spots in the research and development of new secondary chemical power sources. . At present, the negative electrode materials for commercial applications are mainly graphitized carbon materials, but the theoretical capacity of carbon materials is only 372mAh / g. The demand for negative electrode materials. [0003] Compared with graphite, the layer spacing of amorphous carbon is larger, which can accelerate the diffusion of lithium ions. At the same...
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