Preparation method of N/S doubly doped metallic carbon compound material
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A metal-carbon composite and double doping technology, applied in the field of materials science, can solve the problems of poor cycle stability of lithium-ion batteries, achieve high scientific research value, improve cycle stability, and simple preparation process
Active Publication Date: 2017-08-25
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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[0003] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing an N/S double-doped metal-carbon composite m
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[0017] Example 1
[0018] A N / S double-doped metal-carbon composite material containing Co, C, N, S, and O elements.
[0019] The method for preparing the above-mentioned N / S double-doped metal-carbon composite material specifically includes the following steps:
[0020] 1) A step of preparing organic complex materials; dissolving dithizone in ethanol, and then adding the metal atom precursor, the molar ratio of the dithizone organic ligand to the metal atom precursor is 2:1, The metal atom is cobalt, the mixed solution is placed on a stirring table at 45 degrees and stirred for 30 minutes, and then placed in a 60 degrees blast drying oven for drying;
[0021] 2) A preparation step for preparing the N / S double-doped metal-carbon composite material, the organic complex obtained after drying is placed in a tube furnace, and the temperature is kept at 600°C for two hours under the condition of nitrogen. It is 1°C / min, naturally cooled to room temperature, acidified with 1mol hydrochlori...
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[0022] Example 2
[0023] Prepare the obtained N / S double-doped metal-carbon composite material into electrode sheets
[0024] 1) Grind the prepared active material, acetylene black and binder into a slurry at a mass ratio of 8:1:1.
[0025] 2) Pull and grind the slurry on the copper foil and dry it in a vacuum at 80 degrees overnight.
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[0026] Example 3
[0027] The obtained N / S double-doped metal-carbon composite material was subjected to electrochemical performance test
[0028] 1) The dried electrode material is cut into pieces, and a 2032 battery case is selected for assembly in a glove box.
[0029] 2) After the assembled battery is left in the air overnight, perform the electrochemical performance test with the blue dot.
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Abstract
The invention provides a preparation method of an N/S doubly doped metallic carbon compound material. The preparation method comprises the following steps: preparing an organic complex material, namely dissolving dithizone in ethanol, then adding a metal atom precursor, wherein the molar ratio of a dithizone organic ligand to the metal atom precursor is (1-4):1, stirring the mixed solution at the temperature of 30-85 DEG C, and then drying; and then preparing the N/S doubly doped metallic carbon compound material, namely putting the organic complex obtained after drying into a tubular furnace, carrying out heat preservation for 1-12 hours at the temperature of 400-900 DEG C under the nitrogen protection condition, then cooling to room temperature, then carrying out acid pickling, finally activating according to the mass ratio of the material to potassium hydroxide of 1:(2-6), and then washing to be neutral with deionized water, so that the N/S doubly doped metallic carbon compound material is obtained. The preparation method provided by the invention has the advantages that a strong oxidation bridge effect among metal, carbon and hetero atoms is combined, and electrochemical properties of the metallic carbon compound material are effectively improved.
Description
technical field [0001] The invention belongs to the field of materials science, and relates to a negative electrode material of a lithium ion battery, in particular to a preparation method of an N / S double-doped metal-carbon composite material. Background technique [0002] The rapid development of electric vehicles and portable electronic devices puts forward more stringent and demanding requirements on the performance of lithium-ion batteries for supporting power supplies, thus promoting the development of new lithium-ion battery anode materials. Metal oxides have become ideal anode materials due to their high theoretical capacity, good cycle performance, and high safety. However, during the discharge process, the metal oxide electrode material will produce a large volume expansion, resulting in electrode pulverization and severe damage to the microstructure, which in turn causes a rapid capacity decay. In response to these problems, various methods have been used to im...
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