Preparation method and device of water-soluble polymer/inorganic nano-powder composite fiber, lithium ion battery negative electrode material and preparation method

A water-soluble polymer, inorganic nanotechnology, applied in active material electrodes, battery electrodes, conjugated synthetic polymer man-made filaments, etc., can solve the problems of high cost, poor environmental protection, spinning difficulties, etc., and achieve easy operation, Good stability, stable effect of spinning process

Active Publication Date: 2021-01-15
CHINA ENFI ENGINEERING CORPORATION
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Problems solved by technology

[0007] The main purpose of the present invention is to provide a preparation method and device of water-soluble polymer / inorganic nano-powder composite fiber, lithium-ion battery negative electrode material and preparation method, to solve the problem of using solution electrospinning to prepare lithium-ion batteries in the prior art. There are problems such as spinning difficulties, high cost, and poor environmental protection when using composite fibers for negative electrode materials

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  • Preparation method and device of water-soluble polymer/inorganic nano-powder composite fiber, lithium ion battery negative electrode material and preparation method
  • Preparation method and device of water-soluble polymer/inorganic nano-powder composite fiber, lithium ion battery negative electrode material and preparation method
  • Preparation method and device of water-soluble polymer/inorganic nano-powder composite fiber, lithium ion battery negative electrode material and preparation method

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preparation example Construction

[0035] In order to solve the above problems, the present invention provides a method for preparing water-soluble polymer / inorganic nanopowder composite fiber, which includes the following steps: S1, using a mixed solvent of water and ethanol as a spinning solvent to configure a water-soluble polymer and the precursor slurry of inorganic nanopowder; wherein, the average molecular weight of the water-soluble polymer is 58,000-1,300,000; matter / nano-powder composite fiber.

[0036] The invention provides a method for preparing water-soluble polymer / inorganic nanopowder composite fiber, which uses a mixed solution of water and ethanol as a spinning solvent, and uses a relatively low-molecular-weight water-soluble polymer (average molecular weight 58,000-1,300,000 ) as a polymer substrate, adding nano-powder to prepare a precursor slurry, and then electrospinning under a specific humidity condition (30-60%), the spinning process is relatively stable, easy to operate, and can obtain...

Embodiment 1

[0071] Prepare the precursor slurry with 500mL 30vol% ethanol-water, 30.13g nano-silica powder and 350g polyvinylpyrrolidone with a molecular weight of 58000 as raw materials, install the electrospinning module and set the receiving distance to 8cm, open the air inlet valve and exhaust Mouth, at 500mL min -1 The air with a humidity of 30% is passed through at a flow rate of 30% to purge the box. After the humidity in the box is stable, start the electrospinning, the positive voltage is 15kV, the negative voltage is 2kV, and the injection flow rate is 1500μL min -1 , the silicon-polyvinylpyrrolidone composite fiber was obtained on the collector, with a diameter of 500-900 nm, and the recovery rate was calculated to be about 53% based on the accumulated solvent recovery amount after running for 4 hours. Silicon-polyvinylpyrrolidone composite fibers are subjected to two-stage low-temperature heat treatment at 150°C and 250°C and high-temperature heat treatment at 400°C to obtain...

Embodiment 2

[0073] Prepare precursor slurry with 500mL 50vol% ethanol-water, 58.11g nano silicon powder and 300g polyvinylpyrrolidone with a molecular weight of 58000 as raw materials, install the electrospinning module and set the receiving distance to 10cm, open the air inlet valve and exhaust Mouth, at 500mL min -1 Air with a humidity of 40% is passed through at a flow rate to purge the box. After the humidity in the box is stable, start the electrospinning, the positive voltage is 20kV, the negative voltage is 2kV, and the injection flow rate is 2000μL min -1 , silicon-polyvinylpyrrolidone composite fibers were obtained on the collector, with a diameter of 200-400nm, and the recovery rate was calculated to be about 47% based on the cumulative solvent recovery after running for 4 hours. Silicon-polyvinylpyrrolidone composite fibers are subjected to two-stage low-temperature heat treatment at 180°C and 250°C and high-temperature heat treatment at 500°C to obtain silicon-carbon composit...

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Abstract

The invention provides a preparation method and device of a water-soluble polymer/inorganic nano-powder composite fiber, a lithium ion battery negative electrode material and a preparation method. Thepreparation method comprises the following steps of S1, preparing precursor slurry of a water-soluble polymer and inorganic nano-powder by taking a mixed solvent of water and ethanol as a spinning solvent, wherein the average molecular weight of the water-soluble polymer is 58000 to 1300000; and S2, carrying out electrostatic spinning on the precursor slurry under the condition that the humidityis 30%-60% to obtain the water-soluble polymer/nano-powder composite fiber. By utilizing the preparation method, the problems of difficult spinning, high cost, poor environmental protection property and the like when the composite fiber for the lithium ion battery negative electrode material is prepared by utilizing solution electrostatic spinning in the prior art are effectively solved, the water-soluble polymer/inorganic nano-powder composite fiber with good morphology can be obtained, good stability in a heat treatment process is achieved, and the composite fiber is suitable for the lithiumion battery negative electrode material.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a preparation method and device of a water-soluble polymer / inorganic nano-powder composite fiber, a lithium-ion battery negative electrode material and a preparation method. Background technique [0002] Lithium-ion batteries are an important energy storage device in the new energy industry. The performance of electrode materials determines the key performances of lithium-ion batteries such as capacity, charging rate, and cycle life. At present, the mature commercial negative electrode material is graphite, with a theoretical capacity of 372mAh g -1 , after years of research and development, the actual capacity can reach 370mAh g -1 , is very close to the theoretical limit, and can no longer meet the needs of large-scale energy storage facilities and long-life power batteries. It is urgent to develop new high-capacity anode materials. Silicon and lithium can form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/50D01F6/44D01F8/10D01F1/10D01D5/00B82Y40/00H01M4/36H01M4/38H01M4/60H01M10/0525
CPCD01F6/44D01F6/50D01F8/10D01F1/10D01D5/003D01D5/0092D01D5/0061H01M4/364H01M4/386H01M4/602H01M10/0525B82Y40/00H01M2004/027Y02E60/10
Inventor 严大洲杨涛李艳平刘诚孙强万烨司文学张升学
Owner CHINA ENFI ENGINEERING CORPORATION
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