A three-dimensional porous mos 2 /rgo nanomaterials and their preparation methods and applications

A nanomaterial, three-dimensional porous technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of affecting electronic/ionic conductivity, reducing electrochemical performance, reducing rate performance and cycle stability. To avoid problems such as stability, the reaction is easy to control, the repeatability is high, and the yield is high.

Active Publication Date: 2021-04-30
SHAANXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when used as a negative electrode material for sodium-ion batteries, due to the intercalation and extraction of ions during charge and discharge, especially the deintercalation process of sodium ions, MoS with high surface energy will 2 The collapse and accumulation of the sheet structure reduces its rate performance and cycle stability, which in turn affects the electron / ion conductivity between the sheets of S-Mo-S and reduces its electrochemical performance.

Method used

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  • A three-dimensional porous mos <sub>2</sub> /rgo nanomaterials and their preparation methods and applications
  • A three-dimensional porous mos <sub>2</sub> /rgo nanomaterials and their preparation methods and applications
  • A three-dimensional porous mos <sub>2</sub> /rgo nanomaterials and their preparation methods and applications

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Experimental program
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Effect test

Embodiment 1

[0028] A three-dimensional porous MoS 2 The preparation method of / rGO nanometer material comprises the following steps:

[0029] 1) Disperse 0.04g GO in about 50mL deionized water, and 1.0g H 2 CNSNH 2 Added to GO / H 2 O dispersion and stirred on a magnetic stirrer for 2h to prepare solution A;

[0030] 2) Add 0.25g MoO 3 Added to the above solution A, stirred by magnetic force and heated to evaporate the water in the solution to obtain the required preform;

[0031] 3) Under the condition of argon as the protective gas, the preform was heated at 5°C for min -1 The rate is heated from room temperature to 600°C and kept for 4.0h;

[0032] During the heat preservation process, when the temperature rises from room temperature to 100°C, the volume flow rate of argon gas is controlled to 0 sccm to maintain a high concentration of S and MoO 3 Reaction, the argon gas is adjusted to 100 sccm after the reaction is finished, to discharge excess gas, then naturally cool to room tem...

Embodiment 2

[0035] A three-dimensional porous MoS 2 The preparation method of / rGO nanometer material comprises the following steps:

[0036] 1) Disperse 0.06g GO in about 50mL deionized water, and 1.5g H 2 CNSNH 2 Added to GO / H 2 O dispersion and stirred on a magnetic stirrer for 3h to prepare solution A;

[0037] 2) Add 0.3g MoO 3 Added to the above solution A, stirred by magnetic force and heated to evaporate the water in the solution to obtain the required preform;

[0038] 3) Under the condition of argon as the protective gas, the preform was heated at 6°C min -1 Heating rate to 650°C, holding temperature for 3.5h;

[0039] During the heat preservation process, when the temperature rises from room temperature to 150 °C, the volume flow rate of argon gas is controlled to 10 sccm to maintain a high concentration of S and MoO 3 Reaction, the argon gas is adjusted to 120 sccm after the reaction is finished, to discharge excess gas, then naturally cool to room temperature;

[0040]...

Embodiment 3

[0042] A three-dimensional porous MoS 2 The preparation method of / rGO nanometer material comprises the following steps:

[0043] 1) Disperse 0.08 g of GO in about 50 mL of deionized water. 2.0g H 2 CNSNH 2 Added to GO / H 2 O dispersion and stirred on a magnetic stirrer for 4h to prepare solution A;

[0044] 2) Add 0.4g MoO 3Added to the above solution A, stirred by magnetic force and heated to evaporate the water in the solution to obtain the required preform;

[0045] 3) Under the condition of argon as the protective gas, the preform was heated at 7°C min -1 Heating rate to 700°C, holding temperature for 3.0h.

[0046] During the heat preservation process, when the temperature rises from room temperature to 200 ° C, the volume flow rate of argon gas is controlled to 0 sccm to maintain high concentrations of S and MoO 3 Reaction, the argon gas is adjusted to 150 sccm after the reaction is finished, to discharge excess gas, then naturally cool to room temperature;

[00...

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Abstract

The invention discloses a three-dimensional porous MoS 2 The rGO nanometer material and its preparation method and application belong to the technical field of sodium ion battery electrode material preparation. In situ synthesis of 3D porous nanostructured MoS by solid-phase method during fabrication 2 / rGO nanomaterials. Compared with the hydrothermal method reported in most literatures or methods such as hydrothermal treatment first, this method has the characteristics of simple process, easy control of reaction, high repeatability and high yield. On this basis, by controlling the volume flow of argon gas to realize H 2 CNSNH 2 The gas generated by the decomposition can not only reduce MoO 3 It can also meet the effect of hole making. The experimental results show that the three-dimensional porous nanostructure MoS prepared by the method of the present invention 2 / rGO exhibits excellent electrical conductivity, cycle stability, and high specific discharge capacity, and can be widely used as an anode material for Na-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrode materials for sodium ion batteries, and in particular relates to a three-dimensional porous MoS 2 / rGO nanomaterials and their preparation methods and applications. Background technique [0002] With the rapid development of the electric vehicle and mobile electronic device market, the requirements for battery materials are getting higher and higher. Finding the right battery material has a big impact on the functionality of electronic devices. The main components of a lithium-ion battery are a positive electrode, a negative electrode, and an electrolyte. The positive and negative electrodes are the basic materials for the electrochemical reaction and the basis for converting chemical energy into electrical energy, while the electrolyte is the carrier of ion transport in the battery. However, the scarcity of lithium resources limits its further development. Na-ion batteries ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/48H01M4/5815Y02E60/10
Inventor 许占位王天赵怡星关伟伟曹丽云黄剑锋沈学涛冯兰
Owner SHAANXI UNIV OF SCI & TECH
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