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Preparation method of anode material Fe3O4/MoS2 for lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., to achieve the effects of good crystallinity, novel morphology and easy control of reaction conditions

Active Publication Date: 2015-12-09
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, no hydrothermal method has been used to prepare MoS 2 / Fe 3 o 4 Related reports on composite materials with nanosheet structure

Method used

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  • Preparation method of anode material Fe3O4/MoS2 for lithium ion battery
  • Preparation method of anode material Fe3O4/MoS2 for lithium ion battery
  • Preparation method of anode material Fe3O4/MoS2 for lithium ion battery

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specific Embodiment approach 1

[0028] 1. Preparation of nanoflower spherical MoS 2 : Dissolve a certain amount of sodium molybdate and thiourea in distilled water at the same time, the concentrations are 0.13-0.17mol / L and 0.33-0.67mol / L respectively, during the full stirring process, add a certain amount of polyethylene glycol to make the concentration It is a solution of 0.002-0.004g / ml. After stirring, transfer the above solution to a 50ml polytetrafluoroethylene reactor, seal the reactor, and keep the temperature in an oven at 180-200°C for 16-24 hours. After the reaction was completed, after cooling down to room temperature naturally, the black precipitate was collected, washed with water and absolute ethanol several times to remove impurities, and dried at 60°C to obtain MoS 2 black powder.

[0029] 2. Preparation of MoS 2 Nanoparticle dispersion: MoS 2 The particles are dispersed into the mixture of alkali and triethanolamine with a molar ratio of 3:5 at a ratio of 5-10mg / ml, and are evenly divide...

specific Embodiment approach 2

[0036] Preparation of nanoflower cluster MoS 2 : Dissolve 0.005mol sodium molybdate and 0.02mol thiourea in 30ml distilled water, add a certain amount of polyethylene glycol with a concentration of 0.004g / ml during the process of full stirring, transfer the above solution to 50ml polytetrafluoroethylene after fully stirring In the vinyl fluoride reaction kettle, the reaction kettle was sealed, and the temperature was kept at 200° C. for 24 hours in an oven. After the reaction was completed, after cooling down to room temperature naturally, the black precipitate was collected, washed with water and absolute ethanol several times to remove impurities, and dried at 60°C to obtain MoS 2 black powder.

[0037] (a) Dissolve 0.3mol NaoH and 0.05mol triethanolamine in 100ml deionized water to prepare a mixed solution, add 5gMoS 2 , ultrasonically mixed for 30 minutes, and divided into two parts on average.

[0038] (b) Dissolve 0.0075mol ferric sulfate and 0.01mol ferrous sulfate i...

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Abstract

The invention provides a preparation method of an anode material Fe3O4 / MoS2 for a lithium ion battery. The preparation method comprises the following steps of; dispersing prepared MoS2 nanoparticles in a mixed solution of alkali and triethanolamine to obtain a mixed alkali liquid; respectively dissolving ferrous sulfate and ferric sulfate in an equal amount of deionized water according to a mole ratio of 4:3; respectively mixing half of the mixed alkali liquid with the ferrous sulfate solution and with the ferric sulfate solution; carrying out a reaction for 20 hours at a constant temperature of 100 DEG C after mixing; and centrifugally separating a black product, cleaning and drying to obtain the anode material Fe3O4 / MoS2 for the lithium ion battery. The prepared MoS2 layered structure is in in-situ composited in a Fe3O4 substrate, the theoretical capacity of the Fe3O4 is effectively improved with the addition of the MoS2, the volume change of a composite material during the charging and discharging circulation is effectively relieved with the combination of the Fe3O4 and the MoS2, the Fe3O4 nanoparticles are also effectively prevented from being agglomerated, and the electrochemical performance of the composite anode material is improved.

Description

technical field [0001] The present invention relates to a preparation method of lithium ion battery negative electrode material, specifically a kind of Fe 3 o 4 / MoS 2 Preparation methods of nanocomposites. Background technique [0002] The structure and morphology of materials have a great influence on the performance. For example, zero-dimensional structures (such as nanospheres, nanodots) have the smallest specific surface area and excellent thermal stability, orientation growth of one-dimensional structures (such as nanotubes, nanowires) can be used to prepare micro-devices, two-dimensional structures (such as Nanosheets) generally have large exposed crystal planes and special crystal plane orientations. The three-dimensional structure is synthesized under the guidance of template materials or prepared by self-assembly of low-dimensional materials, and has the characteristics of a secondary structure. For the two-dimensional structure, due to its unique structure and...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/523H01M4/5815H01M10/0525Y02E60/10
Inventor 王敬平徐春波夏天
Owner HARBIN ENG UNIV
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