A nitrogen-doped porous carbon negative electrode energy storage material with long cycle performance and a preparation method thereof

Abstract

The invention discloses a waste-derived nitrogen-doped porous carbon negative electrode energy storage material and a preparation method thereof, which comprises the following steps: firstly, collecting baby diapers used by a baby, taking out the yellow-brown superabsorbent particles in baby diapers, and controlling the temperature; secondly, collecting the superabsorbent particles in baby diapersafter the baby is used; and thirdly, collecting the superabsorbent particles in baby diapers used by the baby. The yellowish-brown precursor was prepared by freeze-drying at 50 DEG C under the protection of nitrogen, helium or argon, and the heating rate is controlled at 1-10 DEG C / min to 400-1000 DEG C for calcination for 15-300min, and then naturally cooled to room temperature to obtain the calcinated crude product, which is ground with agate mortar under the condition that the environmental humidity is less than 40%, washed with acid, centrifugally washed with secondary distilled water at60 DEG C for three times, and finally dried in vacuum at 80 DEG C to obtain the nitrogen-doped porous carbon anode energy storage material with long cycle performance. It has very high initial capacity, excellent cycle stability and good rate performance. The preparation method is simple, low cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to a battery electrode material, in particular to a nitrogen-doped porous carbon negative electrode energy storage material with long cycle performance and a preparation method thereof, belonging to the field of materials science. Background technique [0002] Since graphite, as a battery anode material, has only limited capacity under lithium storage conditions, porous carbon based on a hard carbon mechanism stores more capacity. In the case of sodium negative electrodes, the disordered structure of the house of cards model is more conducive to the storage of sodium ions, so the composite material of porous hard carbon matrix is ​​very conducive to the storage of lithium ions and sodium ions. However, these come from the lack of doping modification of heteroatoms in pyrolytic carbon, because the modification of heteroatoms can improve the electronic conductivity which is not high, and the doping of heteroatoms can effectively imp...

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Problems solved by technology

[0003] At present, the application of baby diapers has not been paid attention to, and there is no unified treatment. In summary, it has a good prospect to be applied to the electrodes of energy storage batteries after our recycling, which can completely treat its waste Recycling is beneficial to environmental protection; at the same time, it exhibits better cycle characteristics in energy storage anode materials, and has a higher specific capacity than graphite electrodes (372mAh / g)

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