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Nano silicon metal composite material and preparation method thereof

A metal composite material, nano-silicon technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficult process control, difficult mass production, complex process, etc. Simple, easy to operate, simple process effect

Active Publication Date: 2015-05-13
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation methods may involve complex process (such as template method), difficult process control, expensive equipment (such as chemical vapor deposition method), and it is difficult to achieve mass production

Method used

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  • Nano silicon metal composite material and preparation method thereof
  • Nano silicon metal composite material and preparation method thereof
  • Nano silicon metal composite material and preparation method thereof

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preparation example Construction

[0036] The preparation method of the nano-silicon-metal composite material provided by the invention comprises the following steps:

[0037] 1. The porous block composed of metal, metal oxide and silicon dioxide is combined with a conductive cathode current collector as the cathode, graphite or an inert anode as the anode, placed at a certain temperature with CaCl 2 or as CaCl 2 In the main mixed salt melt electrolyte, a voltage is applied between the cathode and the anode, and the electrolysis power is used as a means of controlling the end of the electrolysis process, so that the silicon dioxide in the porous block is electrolytically reduced to nano-silicon, and nano-silicon metal is produced at the cathode composite material. The electrolysis time is when the electrolysis power reaches the theoretical required power and above. The theoretical required electricity is the electricity calculated based on the electrons consumed by SiO2 into simple Si, which changes with the ...

Embodiment 1

[0052] 60mol% of nano-SiO with a purity of 99.95wt% 2 The powder is stirred with water to form colloidal silica, the mass ratio of water to SiO2 is 2:1, and 30mol% of commercially available spherical nickel powder with a diameter of 2-10μm and 10mol% of commercially available nickel oxide with a purity of 98wt% are added In the colloid, a high-speed mechanical fusion is added to make the silica evenly coated on the metal nickel to form a mixture, and then the mixture is made into a block green body, and the block green body forms a porous block under a certain mechanical pressure or a certain temperature , the mechanical pressure of the porous block is 14MPa, the temperature of the porous block is 900°C, the porosity of the obtained porous block is 30% by volume, and the density is 1.3g / cm 3 , the conductivity is 0.8Ω·cm, the porous block is combined with the conductive cathode current collector as the cathode, the graphite rod is used as the anode, and the CaCl 2 As an elect...

Embodiment 2

[0055] 60mol% of nano-SiO with a purity of 99.95wt% 2 The powder is stirred with water to form colloidal silica, the mass ratio of water to SiO2 is 2:1, 20mol% of commercially available spherical nickel powder with a diameter of 2-10μm and 20mol% of commercially available nickel oxide with a purity of 98wt% Add it to the colloid, and combine it with high-speed machinery, so that the silicon dioxide is uniformly coated on the metal nickel to form a mixture, and then the mixture is made into a block green body, and the block green body forms a porous block under a certain mechanical pressure or a certain temperature The mechanical pressure of the porous block is 14MPa, the temperature of the porous block is 900°C, the porosity of the obtained porous block is 23% by volume, and the density is 1.4g / cm 3 , the electrical conductivity is 1.2Ω2 cm, the porous block is combined with the conductive cathode current collector as the cathode, the graphite rod is used as the anode, and the...

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Abstract

A nano silicon metal composite used for a negative electrode of a lithium ion battery comprises the following parts: (a) the first component part is simple substance silicon with the content accounting for 5-75mol% of the nano silicon metal composite; (b) the second component part contains a metal element, a compound formed and a silicon oxygen compound formed by the metal element and silicon, the second component part content accounts for 25 to 95mol% of the nano silicon metal composite; and (c) the third component part is simple substance carbon with the content accounting for 0-70mol% of the nano silicon metal composite. The preparation method is as follows: a porous block, comprising silica and metal or metal oxide and the like, and a conductive negative electrode current collector are compounded as a negative electrode, graphite or an inert positive electrode is used as a positive electrode, the negative electrode and the positive electrode are placed in a mixed salt melt electrolyte using CaCl2 or CaCl2 as the main components, voltage is applied between the negative electrode and the positive electrode, current density and electrolytic quantity are controlled, silica in the porous block is electrolyzed and reduced into nano silicon, and a nano silicon metal composite material is prepared on the negative electrode.

Description

technical field [0001] The invention relates to a silicon-metal composite material for a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries are widely used in various electronic devices. With the development of electronic devices, the demand and performance requirements of their power systems - chemical power sources - have increased dramatically. Most commercial Li-ion batteries have anodes containing materials such as graphite, which incorporate lithium through an intercalation mechanism during charging. This insertion type anode shows good cycle life and coulombic efficiency, but limited by the low theoretical capacity (372mAh / g), it is difficult to improve the performance of the battery through the battery preparation process. [0003] The second class of anode materials, Si, Sn, and Sb, which introduce lithium through an alloying mechanism during charging, is a better choice for high-capacity anode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/1395H01M4/386H01M4/62H01M10/0525Y02E60/10
Inventor 杨娟玉于冰卢世刚王晗王宁方升闫坤
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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