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Template-free preparation method of modified hollow silicon microspheres

A silicon microsphere, template-free technology, applied in the direction of silicon, active material electrodes, structural parts, etc., can solve the problems of cumbersome preparation process, low Coulombic efficiency, large specific surface area of ​​hollow silicon nanospheres, etc., achieve simple and safe process, improve Coulombic efficiency, the effect of reducing volume expansion

Pending Publication Date: 2021-11-12
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hollow nano-silicon spheres are often prepared by the template method, which requires HF or HCl to remove the internal template, and the preparation process is cumbersome (Jiangyan Wang, Yi Cui, Dan Wang, Adv Mater.2019, 31(38), e1801993); In addition, Hollow silicon nanospheres have a large specific surface area, resulting in low Coulombic efficiency in the first week and during cycling

Method used

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  • Template-free preparation method of modified hollow silicon microspheres
  • Template-free preparation method of modified hollow silicon microspheres
  • Template-free preparation method of modified hollow silicon microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Add nano-silicon particles and polyethylene to deionized water, and ultrasonically vibrate for 10min at 40kHZ to obtain a dispersion; wherein, the particle diameter of nano-silicon particles is 100nm; the mass ratio of deionized water, nano-silicon particles and polyethylene is 180:20:1.

[0040] (2) Utilize a peristaltic pump to pass the dispersion into the reaction tank of an ultrasonic atomization device, and perform ultrasonic atomization under the action of pressure-sensitive ceramics to obtain atomized droplets; wherein, the atomization is carried out under a nitrogen atmosphere, and the atomization The gas flow rate is 150mL / min.

[0041] (3) Under a nitrogen atmosphere, pass the atomized liquid droplets into a high-temperature reaction furnace, pyrolyze them at 500°C for 0.5h, and recover the samples with a rear-end liquid-phase tail gas collection device to obtain a modified hollow silicon microsphere .

[0042] The SEM test results of the final product a...

Embodiment 2

[0045] (1) Add nano-silicon particles and polypropylene to deionized water, and ultrasonically vibrate for 10 minutes at 40kHZ to obtain a dispersion; wherein, the particle diameter of nano-silicon particles is 200nm; the mass ratio of deionized water, nano-silicon particles and polyethylene is 90:10:1.

[0046] (2) Utilize a peristaltic pump to pass the dispersion into the reaction tank of an ultrasonic atomization device, and perform ultrasonic atomization under the action of pressure-sensitive ceramics to obtain atomized droplets; wherein, the atomization is carried out under a nitrogen atmosphere, and the atomization The gas flow rate is 100mL / min.

[0047](3) Under a nitrogen atmosphere, pass the atomized liquid droplets into a high-temperature reaction furnace, pyrolyze them at 500°C for 0.5h, and recover the samples with a rear-end liquid-phase tail gas collection device to obtain a modified hollow silicon microsphere .

[0048] The SEM test results of the final produ...

Embodiment 3

[0051] (1) Add nano-silicon particles and polypropylene to deionized water, and ultrasonically vibrate for 10 minutes at 40kHZ to obtain a dispersion; wherein, the particle diameter of nano-silicon particles is 300nm; the mass ratio of deionized water, nano-silicon particles and polyethylene is 260:25:1.

[0052] (2) Utilize a peristaltic pump to pass the dispersion into the reaction tank of an ultrasonic atomization device, and perform ultrasonic atomization under the action of pressure-sensitive ceramics to obtain atomized droplets; wherein, the atomization is carried out under a nitrogen atmosphere, and the atomization The gas flow rate is 200mL / min.

[0053] (3) Under a nitrogen atmosphere, pass the atomized liquid droplets into a high-temperature reaction furnace, pyrolyze them at 500°C for 0.5h, and recover the samples with a rear-end liquid-phase tail gas collection device to obtain a modified hollow silicon microsphere .

[0054] The SEM test results of the final pro...

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Abstract

The invention relates to a template-free preparation method of modified hollow silicon microspheres, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: firstly, uniformly mixing and dispersing nano silicon particles, a straight-chain polymer and water with a certain purity to obtain dispersion liquid; then atomizing the dispersion liquid to obtain micron-sized liquid drops; and finally, introducing the liquid drops into a high-temperature reaction furnace, pyrolyzing the polymer, and shrinking the liquid drops to form the silicon microspheres with hollow structures. The modified hollow silicon microspheres prepared by the method have good application prospects in the aspect of long-circulation and low-cost lithium ion battery negative electrode materials.

Description

technical field [0001] The invention relates to a template-free preparation method of modified hollow silicon microspheres, which belongs to the technical field of lithium ion batteries. Background technique [0002] At present, with the increasing consumption of fossil energy, people pay more attention to environmental issues. The development of the electric vehicle industry is conducive to alleviating the increasing consumption of fossil energy and avoiding environmental pollution caused by vehicle exhaust. Lithium-ion batteries have the advantages of high energy density, high cycle life, and good safety. They are now widely used in portable electronic devices, and their applications in electric vehicles and other fields are growing rapidly. [0003] Artificial graphite has achieved large-scale application in the field of lithium-ion battery anode materials. The theoretical specific capacity of graphite itself is low (374mAh / g). At present, the specific capacity of comme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/02H01M4/38H01M10/0525
CPCC01B33/02H01M4/386H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 李宁董宇苏岳锋陈来曹端云马亮陈峒任卢赟黄擎
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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