Preparing method of nanometer silicon-carbon composite lithium-ion battery negative electrode material

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problem that the agglomeration of nanomaterials is difficult to disperse uniformly, it is difficult to overcome the first efficiency, and the chemical vapor deposition is difficult to coat. Silicon materials and other problems, to achieve the effect of low price, excellent pore-making effect and rich source

Active Publication Date: 2017-05-31
JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the above method 1) due to the use of nano-silicon materials, its cost is high, and it is difficult to disperse uniformly due to the agglomeration of nano-materials; method 2 uses high-energy ball milling, which has a long preparation cycle and high cost; method 3) uses chemical vapor deposition It is difficult to coat silicon material uniformly on the surface of graphite particles
In addition, it is difficult for the above methods to overcome the problem of taking into account both capacity play and first-time efficiency.

Method used

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  • Preparing method of nanometer silicon-carbon composite lithium-ion battery negative electrode material
  • Preparing method of nanometer silicon-carbon composite lithium-ion battery negative electrode material
  • Preparing method of nanometer silicon-carbon composite lithium-ion battery negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0031] Put 40g of polycrystalline silicon with a purity of 99.999%, 20g of paraffin wax, 20g of glucose, and 100g of ethanol in a ball milling tank device, control the ball milling speed to 400 rpm, and after 40 hours of ball milling, dry and granulate to obtain a precursor. Place it in an oven at 150°C for 10 hours to melt out the paraffin in the particles to obtain the precursor material. Under the protection of nitrogen, the precursor material is subjected to high-temperature sintering treatment, and the heating rate during high-temperature sintering treatment is controlled at 10°C / min. 1100°C, sintering time is 5h, the carbon-coated porous silicon material is obtained, and the XRD of carbon-coated porous silicon carbon is shown in the attached figure 1 , SEM see attached figure 2, weighed 5g of carbon-coated porous silicon material after sintering, and 95g of mesophase carbon microspheres, and mixed them in a V-type machine for 4 hours to obtain anode materials for nano-s...

Embodiment 2

[0035] Put 20g of polycrystalline silicon with a purity of 99.999%, 40g of paraffin wax, 10g of glucose, and 100g of ethanol in a ball mill tank, and after ball milling at 400 rpm for 40 hours, dry and granulate to obtain precursor 1, and place the precursor in an oven at 150°C After 24 hours, the paraffin in the particles was melted to obtain the precursor material. Under the protection of nitrogen, the precursor material was sintered at a high temperature. The heating rate was 5°C / min, the sintering temperature was 1100°C, and the sintering time was 5h to obtain porous silicon carbon. Materials, carbon-coated porous silicon carbon XRD see appendix figure 1 , SEM see attached figure 2 , weighed 5g of the sintered material, 95g of mesophase carbon microspheres, and mixed them in a V-type machine for 4 hours to obtain a nano-silicon-carbon composite lithium-ion battery negative electrode material XRD test. image 3 .

[0036] Its charging capacity is 446mAh / g, and its initia...

Embodiment 3

[0038] Put 20g of monocrystalline silicon with a purity of 99.999%, 40g of naphthalene, 10g of glucose, and 100g of ethanol in a ball mill tank, and after ball milling at 400 rpm for 40 hours, dry and granulate to obtain a precursor. Put it in the oven for 24 hours, melt the paraffin in the particles to obtain the precursor material, under the protection of nitrogen, carry out high-temperature sintering treatment on the precursor 2, the heating rate is 10°C / min, the sintering temperature is 1100°C, and the sintering time is 5h, and the porous Silicon carbon material, carbon-coated porous silicon carbon XRD see appendix figure 1 , SEM see attached figure 2 , weighed 5g of sintered material, 95g of artificial graphite, and mixed it in a V-type machine for 4 hours to obtain a nano-silicon-carbon composite lithium-ion battery negative electrode material. XRD test is shown in the appendix image 3 .

[0039] Its charging capacity is 440mAh / g, and its first-time efficiency is 89%...

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Abstract

The invention provides a preparing method of a nanometer silicon-carbon composite lithium-ion battery negative electrode material. A composite of porous silicon and graphite and a microwave drying method are adopted. The preparing method comprises the following steps of 1, proportionally mixing and ball-milling micrometer silicon, low-melting-point organic matter, carbon sources and a ball milling auxiliary into a ball-milled mixture, and drying the ball-milled mixture for drying pelletizing to obtain a precursor in which micrometer silicon, the low-melting-point organic matter and the carbon sources are evenly distributed; 2, conducting heating treatment on the precursor to make the low-melting-point organic matter molten out to obtain a precursor material in which silicone with a porous structure and the carbon sources are evenly distributed; 3, conducting high temperature sintering on the precursor material under the protection of inert atmosphere to obtain a carbon-covering porous silicon material; 4, proportionally mixing the carbon-covering porous silicon material with a graphite material to obtain the nanometer silicon-carbon composite lithium-ion battery negative electrode material. According to the nanometer silicon-carbon composite lithium-ion battery negative electrode material, the raw materials are rich in sources, low in cost and simple in process, and expansion of a silicon material in the charging and discharging processes is overcome, so that the material has an excellent rate capability and cycle performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery negative electrode material, in particular to a preparation method of a nanometer silicon-carbon composite lithium ion battery negative electrode material. Background technique [0002] Compared with traditional lead-acid, nickel-cadmium, nickel-metal hydride and other secondary batteries, lithium-ion secondary batteries have high working voltage, small size, light weight, high capacity density, no memory effect, no pollution, small self-discharge and good cycle life. Long life and other advantages. Since a Japanese company successfully commercialized lithium-ion batteries in 1991, lithium-ion batteries have become the dominant power source for mobile phones, notebook computers and digital products, and their applications in electric vehicles and energy storage have become more and more extensive. [0003] At present, the anode materials for large-scale commercial use of lithiu...

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
CPCB82Y30/00H01M4/366H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 黄雨生褚相礼张建峰吴壮雄
Owner JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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