hollow nanofiber co 3 o 4 /s composite material and preparation method and use
A nanofiber and composite material technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low specific capacity and poor conductivity of the positive electrode, and achieve high specific capacity and good rate performance. , the effect of good cycle stability
Active Publication Date: 2021-06-18
XIJING UNIV
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Problems solved by technology
[0007] The object of the present invention is to provide a kind of hollow nanofiber Co 3 o 4 The / S composite material and its preparation method and application solve the problems of poor conductivity and low specific capacity of the positive electrode of the existing lithium battery, and can improve the specific capacity and have good rate performance
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Embodiment 1
[0036] (1) 1.2g Co(CH 3 COO) 2 4H 2 O (cobalt acetate tetrahydrate), 0.5g PAN (polyacrylonitrile) and 0.1g PVP (polyvinylpyrrolidone) were dissolved in 15ml DMF (N,N-dimethylformamide), and stirred under electromagnetic stirring at room temperature for 15-18h , standing for 12 to 15 hours to obtain electrospinning solution;
[0037] (2) Use a syringe (needle inner diameter 1.2mm) to extract the electrospinning solution prepared in step (1), fix it on a high-voltage electrospinning machine for electrospinning, and use carbon paper as a receiving device to collect, the voltage is 15kV, and the needle and carbon The paper spacing is 12-15 cm, the injection flow rate is 60 μL / min, the temperature is 21-25 °C, and the relative humidity is 80%, to prepare nanofibers;
[0038] (3) oxidizing the nanofibers prepared in step (2) in air at 300°C for 2 hours, thereby preparing the HCON material;
[0039] (4) After mixing sulfur and the HCON material prepared in step (3), place it at 1...
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Abstract
The invention discloses a hollow nanofiber Co 3 o 4 / S composite material and its preparation method and application, the method includes: (1) dissolving cobalt acetate, polyacrylonitrile and polyvinylpyrrolidone in an organic solvent, stirring at room temperature, and standing to obtain an electrospinning solution; (2) extracting the electrospinning solution Electrospinning was carried out, and samples were collected with carbon paper, the voltage was 15kV, the distance between the electrospinning needle and the carbon paper was 12-15cm, the injection flow rate was 60μL / min, the temperature was 21-25°C, and the relative humidity was 80%. , to prepare nanofibers; (3) oxidize nanofibers in air at 300°C to obtain HCON materials; (4) mix sulfur and HCON materials and keep them warm at 155°C to prepare hollow nanofibers Co 3 o 4 / S Composite. The composite material of the invention can suppress the shuttle effect of polysulfides, increase the specific capacity and have good rate performance.
Description
technical field [0001] The invention relates to a hollow nanofiber composite material, in particular to a hollow nanofiber Co 3 o 4 / S composite material and its preparation method and application. Background technique [0002] Lithium-sulfur battery is an energy storage system with high specific capacity (1675mAh / g) and high energy density (2600Wh / Kg), and the sulfur element in the positive electrode of lithium-sulfur battery has no pollution to the environment. However, lithium-sulfur batteries still have the following problems: [0003] (1) The poor conductivity of sulfur leads to its low utilization rate; [0004] (2) The decomposition and shuttle effect of polar polysulfides lead to a decrease in specific capacity; [0005] (3) The specific capacity retention rate after multiple cycles is low, resulting in a short service life. [0006] In recent decades, a lot of progress has been made in the research of cathode materials in lithium-sulfur batteries, and the devel...
Claims
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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/38H01M4/62H01M4/624H01M4/628H01M10/052Y02E60/10
Inventor 刘守法乔勋赵金国赵松
Owner XIJING UNIV