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A kind of network mesoporous hard carbon material, preparation method and application in lithium ion battery
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A lithium-ion battery and hard carbon technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that limit the practical progress of hard carbon materials, hinder large-scale commercial applications, and have large irreversible capacity in the first cycle. The effect of realizing green treatment, realizing high-value utilization, and excellent rate discharge performance
Active Publication Date: 2020-08-25
WEIFANG UNIV OF SCI & TECH +1
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Problems solved by technology
[0005] However, the shortcomings of high electrode potential, potential hysteresis, and large irreversible capacity in the first cycle severely limit the practical application of hard carbon materials.
[0006] In addition, the current commercialized hard carbon materials, such as Sumitomo of Japan and domestic Beiterui and other material manufacturers, are mainly prepared from industrial raw materials such as pyrolysis sucrose, glucose, polyethylene, etc., and the production cost is high, which greatly hinders their large-scale commercialization. application
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Embodiment 1
[0052] Embodiment 1 A kind of preparation method of reticular mesoporous hard carbon material
[0053] Include the following steps:
[0054] (1) Raw material pretreatment
[0055] Remove petioles of mature cucumber vines, leave stems, cut sections, and remove diameter nodes.
[0056] (2) Cleaning and drying
[0057] The above-mentioned vegetable stems were cleaned by a multi-stage cleaning process to remove impurities and pesticide residues: rinse with tap water for 3 minutes, blanch with hot water at 100°C for 3 minutes, rinse with deionized water for 3 times, each time for 3 minutes, and then wash the cucumbers The vines were dried at 105°C for 12 hours.
[0058] (3) Smash
[0059] The dried cucumber stems were mechanically pulverized and passed through a 20-mesh standard sieve to be used as a pyrolytic hard carbon precursor.
[0060] (4) Hydrothermal reaction
[0061] Weigh an appropriate amount of precursor powder, pour it into a hydrothermal reaction kettle filled wit...
Embodiment 2
[0075] Embodiment 2 A kind of preparation method of reticular mesoporous hard carbon material
[0076] Include the following steps:
[0077] (1) Raw material pretreatment
[0078] Remove the petioles of the mature pumpkin vines, leave the stems, cut into sections, and remove the diameter nodes.
[0079] (2) Cleaning and drying
[0080] The raw materials were cleaned with a multi-stage cleaning process: rinse with tap water for 3 minutes, blanched with hot water at 100°C for 2 minutes, and rinsed with deionized water for 3 times, each time for 5 minutes. Then the washed vegetable stems were dried at 105 °C for 12 h.
[0081] (3) Smash
[0082] The dried pumpkin stems were pulverized by a mechanical pulverizer and passed through a 20-mesh standard sieve to be used as a pyrolytic hard carbon precursor.
[0083] (4) Hydrothermal reaction
[0084] Weigh an appropriate amount of precursor powder and pour it into a hydrothermal reactor filled with 5 mol / L KOH solution. High te...
Embodiment 2
[0095] The Raman diffraction spectrum of the hard carbon product obtained in Example 2 is shown in the attached Figure 4 As shown, the calculated defect degree ID / IG of the material structure is 1.10.
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Abstract
The invention provides a mesh-shaped mesoporous hard carbon material which is of a regular three-dimensional porous mesh-shaped mesoporous structure of which the macroscopic mesh pore size is 1-5mu m,the specific surface area is 40-70m<2> / g, the d002 value is within 0.37-0.39nm, and the average mesoporous aperture is 5-7nm. The invention further provides a preparation method of the mesh-shaped mesoporous hard carbon material. The preparation method comprises the following steps: pretreating raw materials, cleaning, drying, crushing, performing a hydrothermal reaction, performing suction filtration, performing calcining carbonization, performing alkali washing and acid washing, drying, and grinding. The invention further provides application of the mesh-shaped mesoporous hard carbon material in preparing lithium ion batteries. The hard carbon material provided by the invention is of the three-dimensional porous mesh-shaped mesoporous structure; the pyrolysis hard carbon material provided by the invention is simple to prepare, rich in raw material, low in cost and good in environment protection. A lithium ion battery made of the material is relatively high in first coulombic efficiency, excellent in rate capability and long in service life.
Description
technical field [0001] The invention relates to a preparation method of a lithium-ion battery negative electrode hard carbon material, in particular to a preparation method of a mesh-shaped mesoporous hard carbon material, and belongs to the technical field of new energy material preparation. Background technique [0002] With the increasing consumption of traditional fossil resources and the continuous deterioration of global environmental quality, the development of new green energy has become an effective means and way to solve the energy and environmental crisis. Lithium-ion batteries have become the main development trend of chemical power sources due to their advantages such as high specific energy, long cycle life, no memory effect, and environmental friendliness, and have increasingly attracted more and more attention from industry and academia. The positive and negative electrode materials as active materials play a decisive role in the performance of lithium-ion ba...
Claims
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