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MoS2 nanosheet vertically embedded biochar nano composite material, and preparation method and application thereof

A nano-composite material and bio-carbon technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of slow electron transfer rate, influence on electron transfer, and reduction of active sites, and achieve Good cycle stability and reversibility, increase the contact area, alleviate the effect of volume pulverization

Active Publication Date: 2021-12-10
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] MoS 2 There are two major problems in practical electrochemical applications: (1) MoS 2 It is easy to aggregate into curds during the growth process, resulting in the reduction of its active sites; at the same time, due to lithium ions and MoS 2 The reaction of the material will cause the volume of the material to expand and cause the structure to break, which will cause the obvious attenuation of the battery capacity and the deterioration of the cycle performance; (2) MoS 2 The low conductivity makes the electron transfer rate of the material slow during the charge and discharge process, and the volume pulverization during the cycle further affects the electron transfer, resulting in lower rate performance
However, the current construction of two-dimensional MoS 2 / C chip-chip coupling structure methods are cumbersome and costly
However, no biological template method has been used to prepare MoS with a special two-dimensional structure. 2 Report on / C Nanocomposite Materials

Method used

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  • MoS2 nanosheet vertically embedded biochar nano composite material, and preparation method and application thereof
  • MoS2 nanosheet vertically embedded biochar nano composite material, and preparation method and application thereof
  • MoS2 nanosheet vertically embedded biochar nano composite material, and preparation method and application thereof

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preparation example Construction

[0035] A kind of MoS 2 A method for preparing a bio-carbon nanocomposite material vertically embedded in nanosheets, comprising the following steps:

[0036] (1) Camellia petals were collected from the campus and washed with deionized water to remove surface dust. The petals were then soaked in aqueous ethanol (50%) for 2 weeks to remove pigments and other organic matter from the petals.

[0037] (2) Wash the pretreated petals 3 times with deionized water, dry them, and then immerse them in a mixed solution of ammonium molybdate and 0.028moL / L thiourea with a concentration of 0.0075moL / L. Afterwards, the ammonium molybdate and thiourea were used to infiltrate the bio-template and transferred to the lining of the reactor, and heated at 220° C. for 6 hours.

[0038](3) Suction filter the mixture after hydrothermal treatment, wash with deionized water and ethanol three times respectively, and put the obtained solid product into an oven at 80° C. for 24 hours. This sample is a ...

Embodiment 2

[0047] (1) Camellia petals were collected from the campus and washed with deionized water to remove surface dust. The petals were then soaked in aqueous ethanol (50%) for 2 weeks to remove pigments and other organic matter from the petals.

[0048] (2) The pretreated petals were washed with deionized water for 3 times, dried, and then immersed in a mixed solution of ammonium molybdate and 0.114moL / L thiourea with a concentration of 0.029moL / L. Afterwards, the ammonium molybdate and thiourea were used to infiltrate the bio-template and transferred to the lining of the reactor, and heated at 220° C. for 6 hours.

[0049] (3) Suction filter the material after hydrothermal treatment, wash with deionized water and ethanol three times, and put the obtained solid product into an oven at 80°C for 24 hours. This sample is a partially carbonized petal / MoS 2 .

[0050] (4) Part of the dried carbonized petals / MoS 2 Place in a tube furnace and calcinate at 550°C for 2 hours under nitro...

Embodiment 3

[0053] (1) Peach blossom petals were collected from the campus and rinsed with deionized water to remove surface dust. The petals were then soaked in aqueous ethanol (50%) for 2 weeks to remove pigments and other organic matter from the petals.

[0054] (2) The pretreated petals were washed with deionized water for 3 times, dried, and then immersed in a mixed solution of ammonium molybdate and 0.114moL / L thiourea with a concentration of 0.029moL / L. Afterwards, the ammonium molybdate and thiourea were used to infiltrate the bio-template and transferred to the lining of the reactor, and heated at 220° C. for 6 hours.

[0055] (3) Suction filter the material after hydrothermal treatment, wash with deionized water and ethanol three times, and put the obtained solid product into an oven at 80°C for 24 hours. This sample is a partially carbonized petal / MoS 2 .

[0056] (4) Part of the dried carbonized petals / MoS 2 Placed in a tube furnace and calcined at 550°C for 2 hours under ...

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Abstract

The invention relates to a MoS2 nanosheet vertically embedded biochar nano composite material, and a preparation method and application thereof, and belongs to the technical field of new materials. The MoS2 / C nano composite material is successfully synthesized by taking plant cells as a carbon source and a structure-oriented template through processes of infiltration, calcination and the like. The synthesized material retains the macroscopic morphology of plants, meanwhile, the MoS2 nanosheets uniformly and directionally grow on the biochar layer, the morphology of biochar promotes dispersion of MoS2, and the obtained material has no obvious agglomeration phenomenon. In the charging and discharging process of the battery, the MoS2 nanosheets increase the contact area between an electrode material and an electrolyte, more Li<+> embedded active sites are generated, and a mixed nanostructure with higher charge mobility is formed. And after 500 times of charge-discharge cycles, the reversible specific capacity of 951mAhg<-1> and the coulombic efficiency of 98% are retained.

Description

technical field [0001] The present invention relates to the technical field of new materials, in particular to a kind of MoS 2 Nanosheet vertically embedded bio-carbon nanocomposite material and its preparation method and application. Background technique [0002] Molybdenum disulfide (MoS 2 ) is a transition metal sulfide with a graphite-like layered structure, which has the characteristics of stable properties, high temperature resistance, simple preparation, and low price, and has broad application prospects in the field of new energy. As a new type of energy storage device, lithium-ion batteries are considered to be one of the high-energy batteries that can best meet the sustainable development requirements of the future society, but the theoretical specific capacity of graphite negative electrodes in commercial lithium-ion batteries is small (372mAhg -1 ), has gradually been unable to meet people's demand for energy storage devices with high energy density and high ra...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525B82Y30/00
CPCH01M4/366H01M4/5815H01M4/583H01M10/0525B82Y30/00H01M2004/027Y02E60/10
Inventor 吴正颖田浩祥陈志刚邢凯刘谢钱君超陈丰
Owner SUZHOU UNIV OF SCI & TECH
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