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A preparation method of nanoporous silicon for lithium battery negative electrode material

A nanoporous, negative electrode material technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of low specific energy, complex preparation methods, and high cost of porous silicon negative electrode materials, and achieve realization Large-scale production, simple preparation process and low cost

Active Publication Date: 2021-02-26
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problems of complex preparation methods, high cost, low efficiency, and low specific energy of the prepared porous silicon negative electrode material in the above-mentioned prior art, one of the purposes of the present invention is to provide a method for preparing nanoporous silicon as a lithium battery negative electrode material

Method used

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  • A preparation method of nanoporous silicon for lithium battery negative electrode material
  • A preparation method of nanoporous silicon for lithium battery negative electrode material
  • A preparation method of nanoporous silicon for lithium battery negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Weigh 100g of nano-magnesium-silicon alloy, put it into a JVOQ433 vacuum heat treatment furnace, keep it at 1200°C for 30min under high vacuum, and keep the vacuum at -0.08MPa to obtain porous silicon.

Embodiment 2

[0036] Weigh 100g of nano-alumina-magnesium-silicon alloy, put it into a JVOQ433 type vacuum heat treatment furnace, keep warm at 1300°C for 20min under high vacuum, and keep the vacuum at -0.01MPa to obtain porous silicon.

Embodiment 3

[0038] Weigh 100g of nano-zinc-cadmium-silicon alloy, put it into a JVOQ433 type vacuum heat treatment furnace, keep warm at 1000°C for 50min under high vacuum, and keep the vacuum at -0.05MPa to obtain porous silicon.

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Abstract

The present invention relates to a kind of porous silicon or porous silicon metal and its preparation method, comprising: 1) placing the nano-silicon-based alloy in a vacuum heat treatment furnace, keeping the vacuum degree between -0.095~0Mpa; then heating, and keeping the temperature at 600~1300°C, and keep warm for 0.1-10h; 3) After the volatile alloy elements in the nano-silicon-based alloy are gradually volatilized under vacuum conditions, nano-porous silicon, the anode material for lithium batteries, is obtained; compared with the existing technology, The preparation method of the present invention is simple, the prepared nanoporous silicon has uniform pore size dispersion, high specific energy, good cycle performance, good rate performance, simple reaction process and less time-consuming, etc. At the same time, the preparation method of the present invention has low cost and high production efficiency. High, can better meet the needs of industrial production and realize large-scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials of lithium ion batteries, and in particular relates to a preparation method of nanoporous silicon, a negative electrode material of lithium batteries. Background technique [0002] Lithium batteries have become the most promising power system for electric vehicles and battery products due to their advantages such as high specific energy, small self-discharge, environmental protection, and long cycle life. At present, the commonly used negative electrodes for lithium batteries are mainly graphite materials. The theoretical capacity of this type of material is only 372mAh / g, and its low theoretical specific capacity limits the overall improvement of lithium battery performance. Therefore, it is particularly important to develop new high specific energy negative electrode materials. [0003] Metal silicon and lithium can form a silicon-lithium alloy (Li 4.4 Si), a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M10/0525C01B33/021B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B33/021H01M4/386H01M10/0525Y02E60/10
Inventor 冯金奎安永灵
Owner SHANDONG UNIV
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