Lithium ion battery self-supporting silicon-based anode material with multilayered film and preparation method of anode material

A silicon-based anode material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low area specific capacity and complex preparation process, achieve high area specific capacity, improve mass specific capacity, Mitigate the effect of capacity decay

Active Publication Date: 2016-10-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of its preparation process is very complicated, and the area specific capacity is low; and the current research is to optimize the structural design at the microstructure level, and no one has done the work of synergistically optimizing the material structure and composition at the macroscopic and microscopic levels.

Method used

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  • Lithium ion battery self-supporting silicon-based anode material with multilayered film and preparation method of anode material
  • Lithium ion battery self-supporting silicon-based anode material with multilayered film and preparation method of anode material

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preparation example Construction

[0024] The preparation method of the lithium-ion battery self-supporting silicon-based negative electrode material of multilayer thin film comprises the following steps:

[0025] 1) Disperse the high molecular polymer in an organic solvent, magnetically stir for 18 to 48 hours and then ultrasonically treat it for 30 to 60 minutes to obtain a 5 to 15wt% high molecular polymer solution;

[0026] 2) Disperse the high molecular polymer and nano-silica powder with a mass ratio of 1:1~12:1 in the same organic solvent, magnetically stir for 18~48 hours, and ultrasonically treat for 30~60 minutes to obtain the high molecular polymer and Nano silicon powder dispersion;

[0027] 3) Electrospinning is carried out using a coaxial spinning device. The inner tube is a dispersion of high molecular polymer and nano-silica powder, and the outer tube is a high molecular polymer solution. First, inject the high molecular polymer solution for 40 minutes. Stop the injection, start injecting the h...

Embodiment 1

[0031] 1) Dissolve 1.5g of polyacrylonitrile in dimethyl diamide, stir it magnetically for 24 hours and then sonicate it for 30 minutes to obtain an 8wt% polymer solution;

[0032] 2) Disperse nano-silica powder and polyacrylonitrile in the same organic solvent, magnetically stir for 24 hours and then ultrasonically treat for 30 minutes to obtain a dispersion of high molecular polymer and nano-silica powder;

[0033] 3) Prepare multi-layer films by spinning with an electrospinning machine: adjust and set appropriate positive high voltage 18Kv, negative high voltage -2kV, ambient temperature 30 oC, the humidity is 40%, and the high-speed directional attachment is selected as the receiving device. Using a coaxial spinning device, the inner tube is a high molecular polymer and nano silicon powder dispersion, and the outer tube is a high molecular polymer solution. The distance from the nozzle of the coaxial spinning device to the receiving device is 15 cm. First inject the high...

Embodiment 2

[0038] 1) Dissolve 1.5g of polyvinylpyrrolidone in dimethyl diamide, stir it magnetically for 24 hours and then sonicate it for 30 minutes to obtain a 5wt% polymer solution;

[0039] 2) Disperse nano-silica powder and polyvinylpyrrolidone in the same organic solvent, magnetically stir for 24 hours, and then ultrasonically treat for 30 minutes to obtain a dispersion of high molecular polymer and nano-silica powder;

[0040] 3) Prepare multi-layer films by spinning with an electrospinning machine: adjust and set appropriate positive high voltage 15Kv, negative high voltage -2kV, ambient temperature 40 o C, the humidity is 40%, and the high-speed directional attachment is selected as the receiving device. Using a coaxial spinning device, the inner tube is a high molecular polymer and nano silicon powder dispersion, and the outer tube is a high molecular polymer solution. The distance from the nozzle of the coaxial spinning device to the receiving device is 10 cm. First inject t...

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Abstract

The invention discloses a lithium ion battery self-supporting silicon-based anode material with a multilayered film and a preparation method of the anode material. The anode material is made from silicon nano-particles and carbon nano-fibers through compounding, wherein the mass ratio of silicon to carbon is 1:0.5-1:6 and the thickness ratio of a carbon fiber layer to a silicon-carbon compound fiber layer is 1:1-1:5. The preparation method comprises the following steps: dispersing a mixture formed from silicon nano-particles / an organic high-molecular polymer and an organic high-molecular polymer in an organic agent, respectively, and performing fully stirring to obtain an uniform suspension and solution; through control of the injection volume and time of electrostatic spinning, obtaining a multilayered periodic structure of carbon-carbon silicon compound-carbon-carbon silicon compound...-carbon; and performing carbonization treatment in the protective atmosphere to obtain the lithium ion battery self-supporting silicon-based anode material with a multilayered film. The anode material has characteristics of self-supporting, high capacity, good cyclic stability and simple preparation.

Description

technical field [0001] The invention relates to a multilayer film lithium ion battery self-supporting silicon-based negative electrode material and a preparation method thereof, belonging to the field of energy materials. Background technique [0002] With the widespread application of electric vehicles, hybrid vehicles, and solar and wind power generation, high-performance storage devices have become increasingly important. Lithium-ion batteries have the advantages of high energy density, good cycle performance, high specific energy, and little environmental pollution, so they are currently one of the most important energy storage devices. [0003] Lithium-ion battery refers to a rechargeable and dischargeable high-energy battery in which Li+ is intercalated and extracted from positive and negative electrode materials. At present, the positive electrode materials generally use lithium intercalation compounds, such as LiCoO 2 , LiNiO 2 , LiMnO 2 etc.; its negative el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/134H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M4/366H01M4/386H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 姜银珠王宝琦刘杨崔迪严密
Owner ZHEJIANG UNIV
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