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Silicon-based cathode composite material for lithium ion battery and preparation method thereof

A technology of composite materials and silicon materials, which is applied in the field of porous silicon-based negative electrode composite materials for lithium-ion batteries, can solve the problems of high production cost of silicon-based negative electrode materials, polluting industrialized production, complex processes, etc., and achieve low production costs and increased electrical conductivity , The effect of simple process

Active Publication Date: 2013-10-16
河北中芯凤华科技发展有限公司
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Problems solved by technology

[0012] Aiming at the deficiencies of the prior art, the inventors of the present invention, after careful investigation and certification, adopted the reaction technology of organosilicon, industrial silicon and halogenated hydrocarbons, combined with the technology of carbon composite modification and modification, to prepare porous Si / CuO x / C composite material is used as the anode material of lithium-ion batteries, which not only actually improves the first irreversible capacity and cycle stability of silicon-based anode materials, but also solves the problems of high production cost, complex process, serious pollution and industrial production difficulties of silicon-based anode materials. question

Method used

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  • Silicon-based cathode composite material for lithium ion battery and preparation method thereof
  • Silicon-based cathode composite material for lithium ion battery and preparation method thereof

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Effect test

Embodiment 1

[0051] The preparation method of the porous silicon-based negative electrode composite material is divided into two steps:

[0052] The first step is to prepare porous silicon-based composites using a fixed bed, as follows: mix 100 grams of silicon powder with CuO x 15 grams of catalyst, ground evenly and packed into a fixed-bed reactor, through monochloromethane, pressure 0.3MPa, the space velocity of monochloromethane is 100h -1 , after preheating, the temperature was raised to 320° C., and the reaction was carried out for 1 day to prepare a porous silicon-based composite material.

[0053] The second step is the post-modification modification of the porous silicon-based composite material. The method is as follows: the above-mentioned porous silicon-based composite material is soaked in 1 mol / L sodium hydroxide solution for 0.5 hours, and then washed repeatedly with deionized water for 5 times. Dry in a vacuum oven at 120°C for 24 hours, weigh the silicon-based composite m...

Embodiment 2

[0055] The preparation method of the porous silicon-based negative electrode composite material is divided into two steps:

[0056] The first step is to use a stirred bed to prepare porous silicon-based composite materials. The method is as follows: mix 100 grams of silicon powder with CuO prepared by yourself x 5 grams of catalyst, ground evenly and packed into a stirred bed reactor, through monochloromethane, pressure 0.1MPa, the space velocity of monochloromethane is 100h -1 , after preheating, the temperature was raised to 300° C., and the reaction was performed for 2 days to prepare a porous silicon-based composite material.

[0057] The second step is the post-modification modification of the porous silicon-based composite material. The method is as follows: the above-mentioned porous silicon-based composite material is soaked in 2mol / L sodium hydroxide solution for 0.5 hours, and then repeatedly washed with deionized water for 5 times. Dry in a vacuum oven at 120°C for...

Embodiment 3

[0059] The preparation method of the porous silicon-based negative electrode composite material is divided into two steps:

[0060] The first step is to use a fluidized bed to prepare porous silicon-based composite materials, the method is as follows: 100 grams of silicon powder and self-prepared CuO x Catalyst 8 grams, grind evenly and pack into fluidized bed reactor, pass through monochloromethane, pressure 0.2MPa, the space velocity of monochloromethane is 100h -1, after preheating, the temperature was raised to 280° C., and the reaction was carried out for 1 day to prepare a porous silicon-based composite material.

[0061] The second step is the post-modification modification of the porous silicon-based composite material. The method is as follows: the above-mentioned porous silicon-based composite material is soaked in 1 mol / L potassium hydroxide solution for 1 hour, and then washed repeatedly with deionized water for 5 times. Dry in a vacuum oven at 120°C for 24 hours,...

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Abstract

The invention discloses a silicon-based cathode composite material for a lithium ion battery and a preparation method thereof. The cathode composite material is a Si / CuOx / C composite material (0<=x<=1) with a porous structure. Silicon with a porous structure is used as a base, and CuOx particles are inserted in the pores, and carbons with different forms are distributed on a surface and pore walls of the silicon-based material. The preparation method of the cathode composite material comprises steps that silicon material realizes pore-forming through an in situ catalytic reaction between silicon and halogenated hydrocarbon, and reaction condition parameters are regulated to control pore size, distribution and amount of porosity of the silicon material; a post-modification technology is employed to carry out modifications on the surface and the pore walls of the porous silicon, so as to obtain the Si / CuOx / C composite material with a porous structure. The porous silicon-based cathode composite material has low production costs, simple process and no pollution, and is suitable for industrialized production; besides the porous silicon-based cathode composite material has high charge and discharge capacity, small initial irreversible capacity and good cycle performance.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a porous silicon-based negative electrode composite material for a lithium ion battery, a preparation method and application thereof. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high open circuit voltage, high energy density, long service life, no memory effect, no pollution, and small self-discharge, and are more and more widely used. Due to the rapid development and wide application of portable electronic devices and electric vehicles, there is an urgent need for lithium-ion batteries with high specific energy, long cycle life, and fast charge and discharge. The current commercial lithium-ion battery anode material is carbon-based anode material, but its theoretical capacity is only 372mAh / g, and it has been developed close to the theoretical value. It can no longer adapt to the miniaturization devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCY02E60/12Y02E60/10
Inventor 苏发兵陈晗车红卫王莹利翟世辉
Owner 河北中芯凤华科技发展有限公司
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