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Cobalt sulfide/carbon fiber compound and preparation method and application thereof

A carbon fiber and composite technology, applied in the field of cobalt sulfide/carbon fiber composites and its preparation, can solve the problems of poor electrical conductivity of materials, achieve the effects of reducing expansion stress, simplifying the preparation process, and excellent electrochemical performance

Active Publication Date: 2018-10-16
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a cobalt sulfide / carbon fiber composite and its preparation method and application, on the one hand to solve the problem of volume expansion and poor material conductivity of existing metal sulfide materials during charging and discharging. On the other hand, a binder-free, self-supporting composite electrode and its preparation method are proposed

Method used

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  • Cobalt sulfide/carbon fiber compound and preparation method and application thereof
  • Cobalt sulfide/carbon fiber compound and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0045] Add 1.4g of polyacrylonitrile into 10mL of N,N-dimethylformamide solution, stir until clear, and record it as solution A. Dissolve 1.164g of cobalt nitrate hexahydrate in 5mL of N,N-dimethylformamide solution, stir until clear, and record it as solution B. Mix the clear A and B solutions together and continue to stir for 24h. Electrospinning is performed on the mixed solution to obtain polyacrylonitrile / cobalt nitrate composite membrane. Among them, electrospinning parameters: voltage 15.6 kV, liquid supply rate 0.8 mL / h, drum speed 700 r / min, needle size 21º, distance from needle to drum 28 cm, temperature 40 °C, humidity 10%.

[0046] The obtained polyacrylonitrile / cobalt nitrate composite membrane was placed in a methanol solution containing 0.9852g 2-methylimidazole for 24 hours to obtain polyacrylonitrile / cobalt nitrate@metal organic framework (ZIF-67). The obtained polyacrylonitrile / cobalt nitrate@metal organic framework (ZIF-67) was dried in a vacuum oven at 70...

Embodiment 2

[0055] Add 1.4g of polyacrylonitrile into 10mL of N,N-dimethylformamide solution, stir until clear, and record it as solution A. Dissolve 0.873g of cobalt nitrate hexahydrate in 5mL of N,N-dimethylformamide solution, stir until clear, and record it as solution B. Mix the clear A and B solutions together and continue to stir for 24h. Electrospinning is performed on the mixed solution to obtain polyacrylonitrile / cobalt nitrate composite membrane. Among them, electrospinning parameters: voltage 15.6 kV, liquid supply rate 0.8 mL / h, drum speed 700 r / min, needle size 21º, distance from needle to drum 28 cm, temperature 40 °C, humidity 10%.

[0056] The obtained polyacrylonitrile / cobalt nitrate composite membrane was placed in a methanol solution containing 0.9852g 2-methylimidazole for 24 hours to obtain polyacrylonitrile / cobalt nitrate@metal organic framework (ZIF-67). The obtained polyacrylonitrile / cobalt nitrate@metal organic framework (ZIF-67) was dried in a vacuum oven at 70...

Embodiment 3

[0060] Add 1.4g of polyacrylonitrile into 10mL of N,N-dimethylformamide solution, stir until clear, and record it as solution A. Dissolve 1.455g of cobalt nitrate hexahydrate in 5mL of N,N-dimethylformamide solution, stir until clear, and record it as solution B. Mix the clear A and B solutions together and continue to stir for 24h. Electrospinning is performed on the mixed solution to obtain polyacrylonitrile / cobalt nitrate composite membrane. Among them, electrospinning parameters: voltage 15.6 kV, liquid supply rate 0.8 mL / h, drum speed 700 r / min, needle size 21º, distance from needle to drum 28 cm, temperature 40 °C, humidity 10%.

[0061] The obtained polyacrylonitrile / cobalt nitrate composite membrane was placed in a methanol solution containing 0.9852g 2-methylimidazole for 24 hours to obtain polyacrylonitrile / cobalt nitrate@metal organic framework (ZIF-67). The obtained polyacrylonitrile / cobalt nitrate@metal organic framework (ZIF-67) was dried in a vacuum oven at 70...

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Abstract

The invention discloses a cobalt sulfide / carbon fiber compound and preparation method and application thereof. The preparation method comprises the steps of A, preparing a polyacrylonitrile / cobalt nitrate composite film by an electrospinning method; B, immersing the polyacrylonitrile / cobalt nitrate composite film in a solution containing 2-methylimidazole to obtain a polyacrylonitrile / cobalt nitrate@metal organic framework; C, calcining the polyacrylonitrile / cobalt nitrate@metal organic framework under an atmosphere of a mixed gas to obtain a cobalt oxide / carbon fiber compound; and D, allowingthe cobalt oxide / carbon fiber compound to react with sublimed sulfur under an atmosphere of an inert gas to obtain the cobalt sulfide / carbon fiber compound. The sulfide / carbon fiber compound can be directly used as a negative electrode of a lithium ion battery, a current collector and a binding agent are not needed, thus, the preparation process of the battery is simplified, no pollution to an environment is generated, and favorable electrochemical performance is shown when the cobalt sulfide / carbon fiber compound is directly used as the negative electrode of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a cobalt sulfide / carbon fiber composite and its preparation method and application. Background technique [0002] The preparation of lithium-ion battery electrodes usually mixes binders, conductive agents, active materials and solvents, and then coats them on the current collector, and rolls them after the solvents evaporate, which is a complicated process. The content of conductive agent and binder in the electrode can reach 10~30%. The binder will affect the loading capacity of the electrode and the transmission of lithium ions. The existence of the current collector, binder and conductive agent will reduce the battery life to a certain extent. Energy Density. With the rapid development of electric vehicles and artificial intelligence, energy storage devices (such as lithium-ion batteries) are also required to have high energy density and high power density. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5815H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 米宏伟罗锋张培新
Owner SHENZHEN UNIV
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