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Graphene modified heterogeneous composite material and preparation method and application thereof

A graphene modification, composite material technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of MoO2 volume change, capacity drop, etc., achieve good charge-discharge cycle performance, limit loss, synthesis method Simple and easy effects

Active Publication Date: 2019-08-13
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of intercalation and delithiation, MoO 2 The volume of will also change drastically, resulting in a significant drop in capacity

Method used

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  • Graphene modified heterogeneous composite material and preparation method and application thereof
  • Graphene modified heterogeneous composite material and preparation method and application thereof
  • Graphene modified heterogeneous composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of MoS 2 / MoO 2 / graphene composites

[0030] Take 100mL of sodium molybdate dihydrate solution (concentration of 0.2mol / L) and 100mL of thiourea solution (concentration of 1.5mol / L), mix and fully stir, and let stand for 6h. Add graphene aqueous dispersion (solid content 15%), mix and stir (stirring rate 200rpm), process 30min at ultrasonic power 500W. The mixed solution was subjected to hydrothermal reaction at 180°C for 3 hours. After the hydrothermal reaction, the precipitate was separated and washed with water to completely remove sodium ions. The dried precipitate was treated at a high temperature of 600° C. for 3 hours under a nitrogen atmosphere, and cooled in a furnace after the reaction to obtain the target product. Elemental analysis tests show that MoS in the final product 2 Accounting for 69.5% of the total mass ratio of the composite, MoO 2 It accounts for 25.3% of the total mass ratio of the composite material, and the rest is ...

Embodiment 2

[0032] Example 2 Preparation of MoS 2 / MoO 2 / graphene composites

[0033] Take 100mL of sodium molybdate dihydrate solution (concentration of 0.5mol / L), 100mL of thiourea solution (concentration of 1.0mol / L), mix and fully stir, and let stand for 6h. Add graphene aqueous dispersion (solid content 20%), mix and stir (stirring rate 400rpm), process 1h at ultrasonic power 700W. The mixed solution was subjected to hydrothermal reaction at 200°C for 6 hours. After the hydrothermal reaction, the precipitate was separated and washed with water to completely remove sodium ions. The dried precipitate was treated at a high temperature of 800° C. for 3 hours under a nitrogen atmosphere, and cooled in a furnace after the reaction to obtain the target product. The spectrum peaks of the obtained product X-ray diffraction pattern and the MoS 2 、MoO 2 The standard peaks are exactly the same, and the half-width of the peaks is larger, indicating that the MoS in the sample 2 and MoO 2 ...

Embodiment 3

[0034] Example 3 Preparation of MoS 2 / MoO 2 / graphene composites

[0035] Take 100mL of sodium molybdate dihydrate solution (solution concentration is 1.0mol / L), 100mL of thiourea solution (concentration is 0.5mol / L), mix and fully stir, let stand for 6h. Add graphene aqueous dispersion (solid content 20%), mix and stir (stirring rate 600rpm), ultrasonic power 800W for 2h. The mixed solution was treated with hydrothermal reaction at 220°C for 6 hours. After the hydrothermal reaction is completed, the precipitate is separated and washed with water to completely remove sodium ions. The dried precipitate was treated at a high temperature of 850° C. for 3 hours under a nitrogen atmosphere, and cooled in a furnace after the reaction to obtain the target product. Elemental analysis tests show that MoS in the final product 2 Accounting for 40.2% of the total mass ratio of the composite material, MoO 2 It accounts for 55.1% of the total mass ratio of the composite material, and...

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Abstract

The invention discloses a graphene modified MoS2 / MoO2 heterogeneous composite material. The heterogeneous composite material is of a wrapping structure formed by taking graphene as a flexible carrierto bear MoS2 and MoO2 particles. The invention also discloses a preparation method and application of the graphene modified MoS2 / MoO2 heterogeneous composite material. The graphene is used as the flexible carrier to bear MoS2 and MoO2 particles and form the wrapping structure, so that the loss of the MoS2 and MoO2 particles is effectively limited. The synthesis method is simple and easy to implement, the mass production can be achieved, and the prepared graphene modified MoS2 / MoO2 heterogeneous composite material serving as a lithium ion battery negative electrode material has good charge-discharge cycle performances, rate capability and stability.

Description

technical field [0001] The invention belongs to the technical field of lithium battery preparation, and in particular relates to a graphene-modified heterogeneous composite material and its preparation method and application. Background technique [0002] With the increasing demand for electric vehicles, hybrid electric vehicles, and green energy storage devices, lithium-ion batteries have become the main power storage devices due to their high energy density and long cycle life. At present, graphite is one of the important components of lithium-ion batteries as an anode material, but the specific capacity of graphite is low (372 mAh g -1 ), seriously restricting its further wide application. The search for new high-capacity lithium battery anode materials is in the ascendant. As lithium battery anode materials, transition metal oxides / sulfides have high specific capacity, such as molybdenum-based anode materials, which have attracted widespread attention. However, the vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/48H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/366H01M4/48H01M4/5815H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 杨刚孙瑞吴曼曼
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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