Anode material for Li-ion batteries and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve volume expansion and other problems, achieve the effects of simple preparation methods, large-scale production, and improved cycle performance and rate performance

Inactive Publication Date: 2017-02-22
HEFEI UNIV OF TECH
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Problems solved by technology

[0004] In order to avoid the shortcomings of the above-mentioned prior art, the present invention provides a lithium-ion battery negative electrode material and a preparation method thereof, aiming at solving the problem of volume expansion of silicon nanomaterials during charging and discharging of the battery, and improving the performance of the battery. Cycle performance and rate performance

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  • Anode material for Li-ion batteries and preparation method thereof
  • Anode material for Li-ion batteries and preparation method thereof
  • Anode material for Li-ion batteries and preparation method thereof

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Embodiment 1

[0030] The present embodiment prepares lithium-ion battery negative electrode material according to the following steps:

[0031] (1) Weigh 0.15g of commercial silicon nanoparticles (diameter 80nm), add them to a mixed solution of 280mL ethanol and 70mL water, and ultrasonically dissolve them in an ultrasonic machine at room temperature (not exceeding 30°C) for 40 minutes, so that the silicon nanoparticles are evenly dispersed Add 400 μL of ammonia water (28.4mol / L), stir for 30 minutes, slowly add 800 μL of tetraethyl orthosilicate dropwise, react for 5 hours, make the outer surface of silicon nanoparticles coated with a layer of silicon dioxide, centrifuge , get Si@SiO 2 For the precursor, collect the sample in a centrifuge tube and wait for the next step.

[0032] (2) Si@SiO obtained in step (1) 2 The precursor was dispersed in 30mL of deionized water, followed by adding 2.5mL of 1mol / L hydrochloric acid solution, ultrasonically dissolved for 1h (note that the temperature...

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Abstract

The invention discloses an anode material for Li-ion batteries and a preparation method thereof. The anode material for Li-ion batteries is characterized in that silica nanoparticles are taken as raw materials, and firstly the surface of the silica nanoparticles is coated with a SiO2 coating to obtain a precursor Si@SiO2; then the surface of the precursor is coated with a PANI coating to obtain a compound material Si@SiO2@PANI; then the PANI is carbonized into porous carbon through calcining the compound material, a compound material Si@SiO2@NOC is obtained; finally SiO2 is removed through mechanical erosion with a hydrofluoric acid, and a compound material Si@SiO2@NOC is obtained to be the anode material for Li-ion batteries. According to the method, the discharged Anode material for Li-ion batteries can be charged, the problem of volume dilation of batteries is effectively solved, circulation property and rate property of batteries are improved; the preparation method is simple, and large scale production can be achieved.

Description

technical field [0001] The invention provides a rechargeable and dischargeable lithium ion battery negative electrode material and a preparation method thereof, belonging to the field of nitrogen and oxygen doped porous (including mesoporous) nano-carbon materials. Background technique [0002] The development of recyclable lithium-ion batteries is an important measure and means to deal with the current increasingly urgent energy and environmental issues, and it occupies a large proportion in the ever-growing electronic products and automobiles. However, the anode materials of traditional lithium-ion batteries are generally carbon materials, and their theoretical specific capacity is low, which limits the development of lithium-ion batteries. Silicon nanomaterials are abundant in the earth's crust and have a high theoretical specific capacity. The theoretical specific capacity of silicon anode materials reaches 4200mAh / g, which is the material with the most potential and adv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62
CPCH01M4/386H01M4/62Y02E60/10
Inventor 张朝峰许润涛饶娟
Owner HEFEI UNIV OF TECH
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