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Vanadium disulfide@carbon paper nanomaterial, preparation method thereof and magnesium-lithium double-ion battery

A technology of vanadium disulfide and nanomaterials, applied in secondary batteries, chemical instruments and methods, nanotechnology, etc., can solve the problems of poor battery capacity and rate performance, reduce ion migration paths, simplify processes, and improve The effect of battery capacity

Inactive Publication Date: 2020-03-27
易航时代(北京)科技有限公司
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Problems solved by technology

[0003] At present, many electrode materials with suitable electrochemical windows for lithium-ion batteries have been successfully applied to magnesium-lithium dual-ion batteries, such as MoS 2 、TiS 2 、VO 2 、LiFePO 4 etc., but these materials only support the intercalation / deintercalation of lithium ions, and there are problems with poor battery capacity and rate performance

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  • Vanadium disulfide@carbon paper nanomaterial, preparation method thereof and magnesium-lithium double-ion battery
  • Vanadium disulfide@carbon paper nanomaterial, preparation method thereof and magnesium-lithium double-ion battery
  • Vanadium disulfide@carbon paper nanomaterial, preparation method thereof and magnesium-lithium double-ion battery

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preparation example Construction

[0029] The invention provides a vanadium disulfide@carbon paper nanomaterial (E-VS 2 @C) preparation method, comprises the following steps:

[0030] N-octylamine, NH 4 VO 3 Mix with thioacetamide to obtain a mixed solution;

[0031] Solvothermal reaction is carried out between the mixed solution and carbon paper to obtain the vanadium disulfide@carbon paper nanomaterial.

[0032] In the present invention, the n-octylamine, NH 4 VO 3 The usage ratio of thioacetamide and thioacetamide is preferably 12-15mL: 0.081-0.082g: 0.262-0.263g. The present invention utilizes n-octylamine to carry out layer expansion modification on vanadium disulfide, so that the interlayer of vanadium disulfide is expanded, and its morphology and structure are also optimized and more open, which is conducive to shortening the ion migration path and facilitating ion intercalation and deintercalation, thereby The battery capacity and rate performance are greatly improved.

[0033] In the present inv...

Embodiment 1

[0045] Step 1: Sample Preparation

[0046] Solvothermal Synthesis of E-VS 2 @C: Measure 12mL n-octylamine in 35mL Teflon liner. Weigh 0.081g of NH 4 VO 3 and 0.262g of thioacetamide were sequentially added to the above-mentioned polytetrafluoroethylene lining filled with n-octylamine, and after stirring for 1h, a piece of carbon paper with a diameter of 16mm was added thereto. Then seal the polytetrafluoroethylene liner in a high-pressure reactor, and react at 160°C for 20h. At the end of the reaction, take out the carbon paper and wash it alternately with deionized water and ethanol for 4 times, and dry it under vacuum at 60°C for 10 hours to obtain E-VS 2 @C, VS 2 The loading range on the carbon paper is 1.2-2.4 mg, and the mass percentage of octylamine embedding is 16±0.5%.

[0047] Step 2: Battery System

[0048] Preparation of positive electrode sheet

[0049] E-VS 2 @C is directly used as the positive electrode of the battery, and the mass density of the active ...

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Abstract

Belonging to the technical field of magnesium-lithium double-ion batteries, the invention provides a vanadium disulfide@carbon paper nanomaterial, a preparation method thereof and a magnesium-lithiumdouble-ion battery. The preparation method of the vanadium disulfide@carbon paper nanomaterial provided by the invention includes the steps of: mixing n-octylamine, NH4VO3 and thioacetamide to obtaina mixed solution; and carrying out solvothermal reaction on the mixed solution and carbon paper to obtain the vanadium disulfide@carbon paper nanomaterial. The method utilizes solvothermal process toembed octylamine micromolecules into vanadium disulfide so as to increase the interlayer spacing of Van der Waals' force, enables embedding and disembedding of magnesium ions and lithium ions jointly,and improves the battery capacity, also because the microstructure becomes open, the ion migration path is reduced, and the rate capability is improved.

Description

technical field [0001] The invention relates to the technical field of magnesium-lithium dual-ion batteries, in particular to a vanadium disulfide@carbon paper nanomaterial, a preparation method thereof, and a magnesium-lithium dual-ion battery. Background technique [0002] As a commercialized metal-ion battery, lithium-ion battery has the advantages of high working voltage, high energy density and long cycle life. However, the safety problems brought about by the growth of lithium metal dendrites, high cost and limited practical energy density restrict the further development of lithium-ion batteries. The new magnesium-ion battery has many advantages complementary to the lithium-ion battery, but there are also some factors that limit its development. One of them is the large polarization caused by the two positively charged magnesium ions, which leads to the slow diffusion kinetics of magnesium ions in the positive electrode material. This problem is particularly prominen...

Claims

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Application Information

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IPC IPC(8): C01G31/00C01B32/00B82Y30/00H01M4/58H01M4/62H01M10/054
CPCB82Y30/00C01G31/00C01P2002/72C01P2004/03C01P2004/04C01B32/00H01M4/5815H01M4/625H01M10/054Y02E60/10
Inventor 卢惠民景鹏成曹媛杨文文
Owner 易航时代(北京)科技有限公司
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