MoS2@C composite anode material for lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of volume expansion structure collapse, poor electrochemical performance, poor electrical conductivity, etc., to achieve good retention, good electricity Chemical properties, simple operation effect

Active Publication Date: 2020-11-06
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies existing in the prior art, the object of the present invention is to provide a kind of MoS2 for lithium ion battery 2 @C composite anode material and its preparation method to solve MoS 2 As an electrode material, it has poor electrical conductivity and poor stability, and the volume expansion during charging and discharging is serious, causing structural collapse, resulting in poor electrochemical performance and other problems.

Method used

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  • MoS2@C composite anode material for lithium ion battery and preparation method thereof
  • MoS2@C composite anode material for lithium ion battery and preparation method thereof
  • MoS2@C composite anode material for lithium ion battery and preparation method thereof

Examples

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Embodiment 1

[0032] 1) Accurately weigh 0.8g of glucose and dissolve it in 30mL of deionized water, then add 10mL of 0.5% surfactant (hexadecyltrimethylammonium bromide), and ultrasonically disperse for 30min to obtain a uniform solution.

[0033]2) Weigh 0.726g of sodium molybdate dihydrate (Na 2 MoO 4 2H 2 O) and 1.198g thiourea (NH 2 CSNH 2 ), sequentially added to the homogeneous solution in step 1), stirred vigorously for 3 hours, then transferred the supernatant liquid to a 50mL stainless steel reactor with polytetrafluoroethylene liner, and placed it in an oven at 180°C for hydrothermal reaction for 10 hours , cooled to room temperature, after the reaction, the hydrothermal reaction product was centrifuged at 10,000 rad / min for 10 min to obtain a black product.

[0034] 3) After the black product obtained in step 2) was washed alternately with deionized water and absolute ethanol for 3 times, it was dried in a vacuum oven at 80°C for 12 hours, and then transferred to a tube furn...

Embodiment 2

[0036] 1) Accurately weigh 0.5g of glucose and dissolve it in 30mL of deionized water, then add 10mL of 0.5% surfactant (hexadecyltrimethylammonium bromide), and ultrasonically disperse for 30min to obtain a uniform solution.

[0037] 2) Weigh 0.484g of sodium molybdate dihydrate (Na 2 MoO 4 2H 2 O) and 0.456g thiourea (NH 2 CSNH 2 ), sequentially added to the homogeneous solution in step 1), stirred vigorously for 3 hours, then transferred the supernatant liquid to a 50mL stainless steel reactor with polytetrafluoroethylene liner, and placed it in an oven at 200°C for hydrothermal reaction for 15 hours , cooled to room temperature, after the reaction, the hydrothermal reaction product was centrifuged at 8000 rad / min for 15 min to obtain a black product.

[0038] 3) After the black product obtained in step 2) was washed alternately with deionized water and absolute ethanol for 3 times, it was dried in a vacuum oven at 60°C for 8 hours, and then transferred to a tube furnac...

Embodiment 3

[0040] 1) Accurately weigh 0.5g of glucose and dissolve it in 30mL of deionized water, then add 10mL of 0.8% surfactant (sodium dodecylsulfonate), and ultrasonically disperse for 30min to obtain a uniform solution.

[0041] 2) Weigh 0.242g of sodium molybdate dihydrate (Na 2 MoO 4 2H 2 O) and 0.76g thiourea (NH 2 CSNH 2 ), sequentially added to the homogeneous solution in step 1), stirred vigorously for 3 hours, then transferred the supernatant liquid to a 50mL stainless steel reactor with polytetrafluoroethylene liner, and placed it in an oven at 220°C for hydrothermal reaction for 20 hours , cooled to room temperature, after the reaction, the hydrothermal reaction product was centrifuged at 9000 rad / min for 12.5 min to obtain a black product.

[0042] 3) After the black product obtained in step 2) was washed alternately with deionized water and absolute ethanol for 3 times, it was dried in a vacuum oven at 70°C for 10 hours, and then transferred to a tube furnace at 600°...

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Abstract

The invention discloses a MoS2@C composite anode material for a lithium ion battery and a preparation method thereof, MoS2 sheets in the composite anode material are stacked disorderly and intertwinedto form a wormlike microsphere structure, and the MoS2@C composite anode material comprises 38-43% of Mo, 47-53% of S and the balance of C. According to the invention, MoS2 and a carbon material arecompounded; the prepared anode material has a wormlike structure; the diffusion path of Li<+> can be shortened; the composite material has excellent rate capability; and the carbon layer coated on thesurface of the MoS2 sheet can limit the further growth of the MoS2 nanosheet and can inhibit the problem of easy volume expansion of the MoS2 composite material in the cycle process, thereby effectively enhancing the rate capability and cycle stability of the lithium ion battery anode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a MoS for lithium-ion batteries 2 @C composite anode material and its preparation method. Background technique [0002] With the development of science and technology and the continuous updating of electronic products, the speed of the earth's energy consumption is accelerating, and the demand for energy is increasing. The energy crisis will become an urgent problem for human beings; Environmental pollution is also another problem that human beings must solve. Therefore, scientists are committed to developing new energy materials that are more efficient, more sustainable, safer and more environmentally friendly. [0003] In recent years, the global electronic product market has continued to expand, and the requirements for battery electrochemical performance have also continued to increase. Among them, lithium-ion batteries have become a research hotspot in the f...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/58H01M10/0525
CPCH01M4/5815H01M4/628H01M4/625H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 陈建何宇唐成玉龚勇
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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