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Porous silicon composite negative electrode material and preparation method thereof

A negative electrode material, porous silicon technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problem of inability to carry out large-scale promotion, increase production requirements and difficulties, porous structure is easy to be destroyed, etc. problems, to achieve the effect of improving cycle stability, good cycle performance, and high specific capacity

Active Publication Date: 2017-05-24
宁波富理电池材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Porous silicon prepared by this method can indeed achieve better cycle performance and first discharge specific capacity, but its preparation cost is high, operation is difficult, and production requirements and difficulties are increased, so it is currently limited to small batch preparation and cannot be carried out large-scale promotion
Jiang Zhiyu and others prepared porous silicon with different porosity by acid etching silicon alloy (Jiang Zhiyu, a lithium-ion battery porous silicon negative electrode material and its preparation method and application: China, 103165874A[P], 2013-06-19), this Although this kind of porous silicon can be produced commercially and has high initial cycle efficiency, its porous structure is easily destroyed, resulting in the detachment of active materials during charging and discharging, shortening the cycle life.

Method used

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  • Porous silicon composite negative electrode material and preparation method thereof
  • Porous silicon composite negative electrode material and preparation method thereof
  • Porous silicon composite negative electrode material and preparation method thereof

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preparation example Construction

[0080] The present invention also provides a method for preparing a porous silicon composite negative electrode material, comprising the following steps:

[0081] (1) Coating the porous silicon substrate with the first conductive material precursor, and then treating it at 400-1600° C. for 5-10 hours to obtain the first precursor;

[0082] The first conductive material precursor includes a conductive carbon material precursor, a mixture of a conductive carbon material precursor and an alloy material precursor, or an alloy material precursor;

[0083] The coating includes emulsification coating, liquid phase coating, gas phase coating or solid phase coating;

[0084] (2) Composite the first precursor with the nano-silicon-based raw material, and then treat it at 400-1600°C for 5-10 hours to obtain a porous silicon composite negative electrode material;

[0085] The nano-silicon-based raw material includes a silicon source, or a mixture of a silicon source and other raw materia...

Embodiment 1

[0133] Disperse porous silicon in a solvent containing grapes, wherein the mass ratio of porous silicon to glucose is 1:1, and the specific surface area of ​​porous silicon is 40cm 2 / g, the average particle size is 13 μm. After the dispersion is uniform, carry out spray drying, the air inlet temperature is 200°C, the air outlet temperature is 100°C, the rotation speed of the dispersion disc is 2000r / min, and then carbonized at 800°C for 5 hours in a nitrogen atmosphere, and then cooled to room temperature to obtain coating cracking The porous silicon material of carbon is the first precursor.

[0134] Place the porous silicon material coated with pyrolysis carbon in a rotary furnace, raise the temperature to 500°C under the high-purity nitrogen flow rate of 5.0L / min, and then change the high-purity nitrogen into high-purity hydrogen and SiH 4 The mixed gas, the flow rate remains unchanged, when the mass ratio of the silane gas and the first precursor is 1:1, the gas is chang...

Embodiment 2 and 3

[0136] The experimental steps in Examples 2 and 3 are the same as in Example 1, only the mass ratio of porous silicon to glucose and the mass ratio of the first precursor to silane are changed. The mass ratio of porous silicon to glucose in Example 2 is 2:1, the mass ratio of the first precursor to silane is 2:1; the mass ratio of porous silicon to glucose in Example 3 is 2:5, the first precursor The mass ratio to silane is 2:5.

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Abstract

The invention provides a porous silicon composite negative electrode material including a porous silicon substrate, a first conductive material layer composited on the surface of the porous silicon substrate, and a nano silicon-based material composited on the surface of the first conductive material layer. Firstly, a conductive material is coated for a first time, then the surface of the conductive material layer continues to be composited with the nano silicon-based material, and the porous silicon composite negative electrode material is obtained; the relatively high first charge / discharge efficiency of the porous silicon material is used, the conductive material coating the surface of the porous silicon material can increase the electrical conductivity of the composite material, can inhibit the porous silicon material from expanding outward to prevent rupture, and improves the cycle stability; after the surface is composited with the nano silicon-based material, better cycle performance is achieved, and the cycle performance of the porous silicon material composite material can be improved; and in addition, the preparation method has the advantages of simple operation, safety, high universality and low costs of production and is suitable for industrialized production.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrode materials, and relates to a porous silicon composite negative electrode material and a preparation method thereof, in particular to a porous silicon composite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long cycle life, light weight, less self-discharge, no memory effect and high cost performance, and have become rechargeable batteries in high-power electric vehicles, artificial satellites, aerospace and other fields The main selection object of the power supply. Especially in practical applications, lithium-ion batteries have become an ideal energy source for various portable electronic devices, such as notebook computers, mobile phones, etc. However, the current lithium-ion batteries can no longer meet the requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/625H01M4/626H01M10/0525Y02E60/10
Inventor 陈溢镭何畅雷夏永高刘兆平
Owner 宁波富理电池材料科技有限公司
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