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Nitrogen-doped porous nano carbon material, preparation method thereof and application of same as lithium ion battery negative electrode material

A nano-carbon material and nitrogen-doped technology, which is applied in the direction of nano-carbon, battery electrodes, secondary batteries, etc., can solve the problem of the inability to achieve precise control of nitrogen doping amount, the difficulty in meeting the demand of nitrogen doping amount, and the restriction of nitrogen-doped carbon Negative electrode materials and other issues, to achieve the effect of facilitating the contact between the electrolyte and the electrode, good product stability, and increasing the number of pores

Active Publication Date: 2020-06-12
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the research on the application of nitrogen-doped carbon anode materials is relatively extensive, but there are still many key problems to be solved urgently: first, the microstructure of traditional carbon-based anode materials is dense, which inhibits the conductivity of anode materials and the rate performance of lithium-ion batteries; secondly, , most of the existing commercial methods require the use of additives such as surfactants, which are costly and environmentally unfriendly; thirdly, the sources of nitrogen in nitrogen-doped carbon materials are currently divided into two methods: precursors and post-modification treatments. , the former cannot achieve precise control of the nitrogen doping amount, while the latter's nitrogen doping amount is difficult to meet the demand
The above problems restrict the practical application of nitrogen-doped carbon anode materials

Method used

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  • Nitrogen-doped porous nano carbon material, preparation method thereof and application of same as lithium ion battery negative electrode material
  • Nitrogen-doped porous nano carbon material, preparation method thereof and application of same as lithium ion battery negative electrode material
  • Nitrogen-doped porous nano carbon material, preparation method thereof and application of same as lithium ion battery negative electrode material

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Embodiment 1

[0035] First measure 125mL of deionized water, weigh 0.59g of potassium permanganate and pour it into deionized water, ultrasonicate for 5 minutes until the potassium permanganate is completely dissolved, and prepare a 0.03mol / L potassium permanganate solution; measure 125mL Deionized water, take by weighing 0.94g manganese nitrate tetrahydrate and be dissolved in above-mentioned deionized water, be mixed with the manganese nitrate solution of 0.03mol / L; Potassium permanganate solution is poured in the manganese nitrate solution, after stirring and mixing, Measure 340 microliters of aniline into the mixed solution, and stir for 30 minutes; then transfer the solution to the lining of the hydrothermal reaction kettle, put it into a heating oven, and carry out the hydrothermal reaction. The reaction time is 6 hours, and the reaction temperature is 180°C; After the reaction, the liquid was taken out and centrifuged, the supernatant was poured off, and the precipitate was washed wit...

Embodiment 2

[0042]First measure 125mL of deionized water, weigh 0.59g of potassium permanganate and pour it into deionized water, ultrasonicate for 5 minutes until the potassium permanganate is completely dissolved, and prepare a 0.03mol / L potassium permanganate solution; measure 125mL Deionized water, weigh 0.47g manganese chloride and dissolve it in the above-mentioned deionized water to prepare a 0.03mol / L manganese nitrate solution; pour the potassium permanganate solution into the manganese nitrate solution, and after mixing evenly, measure Add 340 microliters of aniline to the mixed solution and stir for 30 minutes; then transfer the solution to the lining of the hydrothermal reaction kettle, put it in a heating oven, and carry out hydrothermal reaction. The reaction time is 10 hours, and the reaction temperature is 150°C; After the end, the liquid was taken out and centrifuged, and the supernatant was poured off, and the precipitate was washed with deionized water (four times); fina...

Embodiment 3

[0045] First measure 125mL of deionized water, weigh 0.59g of potassium permanganate and pour it into deionized water, ultrasonicate for 5 minutes until the potassium permanganate is completely dissolved, and prepare a 0.03mol / L potassium permanganate solution; measure 125mL Deionized water, weigh 0.94g manganese nitrate tetrahydrate and dissolve in the above-mentioned deionized water to prepare a 0.03mol / L manganese chloride solution; pour the potassium permanganate solution into the manganese chloride solution, and stir to mix evenly Finally, measure 340 microliters of aniline and add it into the mixed solution, and stir for 30 minutes;

[0046] Then transfer the solution to the lining of the hydrothermal reaction kettle, put it into a heating oven, and carry out the hydrothermal reaction. The reaction time is 6 hours, and the reaction temperature is 180°C. After the reaction is completed, the liquid is taken out and centrifuged, and the supernatant is poured out After the s...

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Abstract

The invention discloses a nitrogen-doped porous nano carbon material, a preparation method thereof and application of same as a lithium ion battery negative electrode material, and belongs to the field of material synthesis. The preparation method comprises the following steps: 1) preparing a potassium permanganate solution, preparing a manganese nitrate solution or a manganese chloride solution,mixing, and adding aniline to obtain a reaction solution; 2) carrying out hydrothermal reaction on the reaction solution to obtain MnOx-loaded polyaniline after the reaction is finished; 3) taking theprecipitate in the reaction product, and carrying out a carbonization reaction on the precipitate under flowing ammonia gas and inert gas to obtain a MnOx-loaded nitrogen-doped carbon material; and 4) pickling the MnOx-loaded nitrogen-doped carbon material obtained in the step 3) to obtain the nitrogen-doped porous nano carbon material. According to the preparation method, a surfactant is not needed, aniline and transition metal salt which are low in price are adopted as raw materials, a hydrothermal reaction and a heat treatment method are adopted for preparing the product, and the nitrogendoping amount is adjustable.

Description

technical field [0001] The invention belongs to the field of material synthesis, in particular to a nitrogen-doped porous nano-carbon material, a preparation method and its application as a lithium-ion battery negative electrode material. Background technique [0002] Lithium-ion battery is a very representative electrochemical energy storage technology, which has the advantages of high energy density, good cycle life, and high voltage. Application prospects of ion batteries. As the key material of lithium-ion batteries, anode materials have a great influence on the rate performance of batteries. Carbon anode materials have been widely studied and applied due to their cheap and easy availability, good electrical conductivity, and long cycle life. However, their low theoretical capacity and rate performance limit their widespread use in more application scenarios. [0003] Nitrogen doping modification is an effective method to improve the electrochemical performance of carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/15H01M4/583H01M10/0525
CPCC01B32/15H01M4/583H01M10/0525Y02E60/10
Inventor 崔笑千李磊王国隆徐浩东宋忠孝李雁淮
Owner XI AN JIAOTONG UNIV
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