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Preparation method and application of cobalt-based sulfide nanosphere carbon fiber integrally comprising core-shell structure

A core-shell structure, nano-sphere technology, applied in structural parts, electrochemical generators, electrical components, etc., can solve the problems of material capacity attenuation, material pulverization and shedding, etc., to improve energy density, alleviate material pulverization, prolong Effects of Cyclic Stability

Active Publication Date: 2018-07-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, the research on the energy storage mechanism of metal sulfides has mainly focused on the reversible conversion mechanism, namely: However, in practical applications, during the process of intercalation and deintercalation of metal sulfide anode materials, due to the repeated expansion and contraction of the volume, the material is pulverized and detached, and the capacity of the material decays rapidly during the cycle.

Method used

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  • Preparation method and application of cobalt-based sulfide nanosphere carbon fiber integrally comprising core-shell structure
  • Preparation method and application of cobalt-based sulfide nanosphere carbon fiber integrally comprising core-shell structure
  • Preparation method and application of cobalt-based sulfide nanosphere carbon fiber integrally comprising core-shell structure

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Experimental program
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Effect test

Embodiment 1

[0062] Prepare 30ml of glycerol and isopropanol at a volume ratio of 1:10 and mix them into the solution, stir evenly, then add 2mmol of cobalt nitrate hexahydrate, stir until the solution is clear, then transfer to a 50ml hydrothermal reaction kettle, 180°C Insulate for 10 hours, cool down, centrifuge, wash and dry. Take 0.3g of the dried product, add 2ml of DMF solution, ultrasonically disperse for 20min, then add 0.2g of PAN, and stir for 24h. Then the prepared solution was transferred to a 5ml jet pump and spun with a positive high pressure of 10kV. Finally, the product obtained by spinning is transferred to a tube furnace to add sulfur source under the protection of Ar gas atmosphere. Different quality of sulfur source, different calcination temperature and holding time will obtain cobalt-based sulfides with different stoichiometric ratios.

[0063] (1) Using sulfur powder as the sulfur source, when N (S) :N (Co) When =1.2:1, be heated up to 700 ℃ with 5 ℃ / min heating ...

Embodiment 2

[0073] Prepare 30ml of glycerol and isobutanol with a volume ratio of 1:12 and mix them into the solution, stir evenly, then add 2.5mmol cobalt nitrate hexahydrate, stir until the solution is clear, then transfer to a 50ml hydrothermal reaction kettle, 200 ℃ for 12 hours, after cooling down, centrifuge, wash and dry. Using the NovaNanoSEM 230 scanning electron microscope of FEI Company in the United States to observe the sample, it was found that the cobalt precursor nanoparticles have regular shape, good dispersion and consistency, and are suitable for the next step of electrospinning. The scanned picture is as follows Figure 11 shown.

Embodiment 3

[0075] Prepare 30ml of glycerol and isobutanol at a volume ratio of 1:15 and mix them into the solution, stir evenly, then add 3mmol of cobalt nitrate hexahydrate, stir until the solution is clear, then transfer to a 50ml hydrothermal reaction kettle, 160°C Insulate for 10 hours, cool down, centrifuge, wash and dry. Take 0.2 g of the dried product, add 5 ml of DMF solution, ultrasonically disperse for 20 min, then add 0.5 g of PAN, and stir for 24 h. Then the prepared solution was transferred to a 10ml jet pump and spun with a positive high pressure of 15kV. Finally, the product obtained by spinning was transferred to a tube furnace under the protection of an Ar gas atmosphere, and was heated with N (S) :N (C o) = Add sulfur powder at a ratio of 8:1, heat up at 3°C / min to 600°C for 2 hours, and obtain a carbon fiber-coated core-shell structure Co 3 S 4 nanospheres. Such as Figure 12 As shown, the sample was observed with a Nova NanoSEM 230 scanning electron microscope f...

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Abstract

The invention discloses preparation method and application of a cobalt-based sulfide nanosphere carbon fiber integrally comprising a core-shell structure. The preparation method comprises the steps offirstly, preparing cobalt precursor nanoparticle by taking cobalt nitrate hexahydrate as a cobalt source and glycerol-containing mixed alcohol as a solvent and by a solvothermal method; secondly, preparing polyproplylene (PAN)-coated cobalt precursor nanosphere by electrostatic spinning; and finally, preparing core-shell structure cobalt-based sulfide particle by high-temperature calcination andvulcanization, carbonizing an organic polymer to obtain the cobalt-based sulfide nanosphere carbon fiber integrally comprising the core-shell structure. By distribution of cobalt-based sulfide core-shell structure nanosphere in the carbon fiber, gradual and accurate control from a single sphere to multiple spheres can be achieved. The core-shell structure cobalt-based sulfide nanosphere carbon fiber is used as a lithium ion battery negative electrode material applied to a lithium ion battery, and the obtained lithium ion battery has favorable rate performance and excellent cycle stability.

Description

technical field [0001] The invention relates to a method for preparing carbon fibers containing cobalt-based sulfide nanospheres with a core-shell structure and an application thereof, and belongs to the technical field of preparation of negative electrode materials for lithium-ion batteries. Background technique [0002] Lithium-ion battery (LIB), with its high energy density and long cycle life, has become one of the most widely used energy storage systems, such as various handheld electronic devices, electric bicycles, electric vehicles, etc. Compared with handheld electronic devices, such as mobile phones and computers, electric vehicles need to significantly improve the performance of lithium-ion batteries in various aspects, such as achieving higher energy density (up to 500Wh / Kg in 2030), better safety and lower cost. Although graphite is the most commercially successful anode material, it still has problems such as low theoretical capacity and potential safety hazard...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/362H01M10/0525Y02E60/10
Inventor 潘安强尹波
Owner CENT SOUTH UNIV
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