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Silicon-nickel composite material used for lithium battery and preparation method thereof

A composite material, lithium-ion battery technology, applied in the field of lithium-ion battery materials, can solve the problems of unfavorable material power density, low electrochemical activity, obvious agglomeration phenomenon, etc., and achieve the effect of improving comprehensive electrochemical performance

Active Publication Date: 2014-09-24
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of this method are: the sol-gel method is usually not conducive to industrial production, and the repeatability is poor; the material usually has large particles, and the agglomeration phenomenon is obvious, which is not conducive to improving the power density of the material
In addition, the electrochemical activity of the C material itself is low. If the content in the composite material is high, it will affect the actual capacity of the Si / C composite material.

Method used

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  • Silicon-nickel composite material used for lithium battery and preparation method thereof
  • Silicon-nickel composite material used for lithium battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Dissolve 40% of polyaniline, 25% of nickel oxalate and 35% of Si powder with a diameter of 30nm in appropriate DMF to form a precursor solution with a mass fraction of 15%; the needle of the precursor solution electrospinning device Electrospinning was carried out in a syringe with a needle aperture of 0.5mm, a spinning voltage of 18kV, a receiving distance of 17cm, a humidity of 25-45%, and a temperature of 40 o C; The resulting spinning precursor is placed in a muffle furnace, from room temperature to 3 o The heating rate of C / min is raised to 300 o C, then 3 o The heating rate of C / min is raised to 330 o C, the pre-oxidized precursor was obtained after cooling with the furnace; the pre-oxidized precursor was placed in a tube furnace with argon protection, with 5 o The heating rate of C / min is raised to 700 o C, after sintering for 3 hours and cooling in the furnace, the Si / NiO / C composite material can be obtained.

Embodiment 2

[0021] Dissolve 60% of PVP, 22% of nickel acetate and 18% of Si powder with a diameter of 200nm in appropriate ethanol to form a precursor solution with a mass fraction of 40%; place the precursor solution in the needle syringe of the electrospinning device Electrospinning is carried out in a medium, the needle aperture is 0.8mm, the spinning voltage is 12kV, the receiving distance is 13cm, the humidity is 25~45%, and the temperature is 20 o C; The resulting spinning precursor is placed in a muffle furnace, from room temperature to 8 o The heating rate of C / min is raised to 200 o C, followed by 1 o The heating rate of C / min is raised to 400 o C, the pre-oxidized precursor was obtained after cooling with the furnace; the pre-oxidized precursor was placed in a tube furnace protected by argon and nitrogen gas mixture (volume ratio 1:1), and the o The heating rate of C / min is raised to 500 o C, after sintering for 7 hours and cooling in the furnace, the Si / NiO / C composite mate...

Embodiment 3

[0023] Such as Figure 1-2 As shown, 52% of PAN, 18% of nickel acetate and 30% of Si powder with a diameter of 100nm were dissolved in appropriate acetone to form a precursor solution with a mass fraction of 30%; the precursor solution was electrospun Electrospinning was carried out in a needle syringe with a needle aperture of 0.6mm, a spinning voltage of 20kV, a receiving distance of 25cm, a humidity of 25-45%, and a temperature of 30 o C; The resulting spinning precursor is placed in a muffle furnace, from room temperature to 5 o The heating rate of C / min is raised to 300 o C, followed by 2 o The heating rate of C / min is raised to 380 o C, the pre-oxidized precursor was obtained after cooling with the furnace; the pre-oxidized precursor was placed in a tube furnace with nitrogen protection, with 10 o C / min heating rate to 650 o C, after sintering for 5 hours and cooling in the furnace, the Si / NiO / C composite material can be obtained.

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Abstract

The invention relates to a composite material with high capacity used for a lithium ion battery, which is characterized in that the material mainly contains Si, NiO and amorphous carbon, wherein Si content is 18-35%, NiO content is 18-25%, and the amorphous carbon content is 40-60%; NiO is obtained through pyrolysis of nickel salt, and the amorphous carbon is obtained through high temperature carbonization of organic polymer. According to the invention, a NiO material having certain electrochemistry activity is added in a traditional Si / C material, and then charge and discharge capacity of the material can be enhanced. In addition, a static spinning method is employed by aiming at preparation of the material, the Si / NiO / C composite material prepared by the method has a fibrous structure, Si and NiO are uniformly distributed on fiber C, so that comprehensive electrochemistry performance of the material can be effectively enhanced.

Description

technical field [0001] The invention relates to a silicon-nickel composite material for lithium batteries and a preparation method thereof, in particular to a high-capacity Si / NiO / C composite material for lithium-ion batteries and its electrostatic spinning preparation method, which belongs to the lithium-ion battery material technology field. Background technique [0002] The negative electrode material is one of the important components of lithium batteries. Most of the traditional negative electrode materials use graphite materials. The discharge voltage of graphite is about 0.2V, and the discharge capacity is about 300mAh / g, but this capacity is far from meeting the needs of future lithium batteries. required. In recent years, Si material has attracted widespread attention. The theoretical capacity of this material can reach more than 2000mAh / g, which is more than 5 times that of graphite, and the discharge platform is equivalent to it, so it has a very good application...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36
CPCH01M4/364H01M4/386H01M4/52H01M4/587H01M10/0525Y02E60/10
Inventor 姜涛陈慧明魏晓川张克金
Owner CHINA FIRST AUTOMOBILE
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