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Porous silicon-carbon composite material for lithium ion battery and preparation method of material

A carbon composite material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that it is difficult to overcome the first efficiency at the same time, the agglomeration of nanomaterials is difficult to uniformly disperse, and chemical vapor deposition is difficult to encapsulate. Silicon-coated materials and other problems, to achieve excellent rate performance and cycle performance, low price, and the effect of overcoming expansion

Inactive Publication Date: 2017-02-22
JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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  • Summary
  • 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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  • Porous silicon-carbon composite material for lithium ion battery and preparation method of material
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  • Porous silicon-carbon composite material for lithium ion battery and preparation method of material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Put 10g of polysilicon with a purity of 99.999% as porous silicon, 25g of CMC, and 250g of deionized water as a ball milling agent and place it in a ball mill tank at a controlled speed of 400 rpm. After 40 hours of ball milling, microwave drying and granulation to obtain a precursor , the obtained precursor is subjected to high-temperature sintering treatment under the protection of nitrogen gas, the heating rate is controlled at 10°C / min, the sintering temperature is 1100°C, and the sintering time is 5h to obtain a carbon-coated porous silicon material. The carbon-coated porous silicon material XRD see attached figure 1 , SEM see attached figure 2 , weigh 5g of the carbon-coated porous silicon material after sintering, and 95g of mesocarbon microspheres, and mix them in a V-type machine for 4 hours to obtain a porous silicon-carbon composite material. The XRD test of the porous silicon-carbon composite material is shown in the attached image 3 .

[0032]Utilize th...

Embodiment 2

[0035] Put 10g of polysilicon with a purity of 99.999%, 10g of CMC, and 100g of deionized water in a ball mill tank. After ball milling at 400 rpm for 40 hours, microwave drying and granulation were performed to obtain a precursor. The obtained precursor was subjected to high temperature under nitrogen protection. Sintering treatment, the heating rate is 10°C / min, the sintering temperature is 1100°C, and the sintering time is 5h to obtain a porous silicon-carbon material, that is, a carbon-coated porous silicon material, the same below, and weigh 5g of the sintered material, that is, a carbon-coated porous silicon material , mesophase carbon microspheres 95g, mixed in a V-type machine for 4h to obtain porous silicon-carbon composites.

[0036] Its charging capacity is 425mAh / g, and its first-time efficiency is 93%. The assembly and testing of the button battery are the same as in Example 1.

Embodiment 3

[0038] Put 10g of monocrystalline silicon with a purity of 99.999%, 10g of CMC, and 100g of deionized water in a ball mill tank, and after ball milling at 400 rpm for 40 hours, microwave drying and granulation to obtain a precursor. Carry out high-temperature sintering treatment, the heating rate is 10°C / min, the sintering temperature is 1100°C, and the sintering time is 5h to obtain a porous silicon carbon material. Weigh 5g of the sintered material and 95g of mesophase carbon microspheres, and mix them in a V-type machine for 4h Finally, a porous silicon-carbon composite material is obtained.

[0039] Its charging capacity is 408mAh / g, and its first-time efficiency is 89% (the assembly and test of the button battery are the same as in Example 1).

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Abstract

The invention discloses a porous silicon-carbon composite material for a lithium ion battery and a preparation method of the material. According to the preparation method, CMC (sodium carboxy methyl cellulose) serves as template agents and enwrapping agents, a porous silicon-carbon material is prepared by the aid of microwave drying technologies, the porous silicon-carbon material and graphite materials are composited to obtain the porous silicon-carbon composite material, the porous silicon-carbon composite material is used for negative electrode materials of the lithium ion battery, the graphite materials are one or more in mesocarbon micro-beads, natural graphite and artificial graphite, porous silicon is carbon-coating nano-scale porous silicon, porous characteristics of the porous silicon are beneficial to absorption and storage of electrolyte solution, a space for volume expansion is provided in the charge and discharge process of the silicon materials, the porous silicon is the nano-scale porous silicon, so that volume effect of silicon particles is relieved, and the porous silicon-carbon composite material has the advantages of high reversible capacity, good circulation performance and excellent rate performance.

Description

[0001] Technical field: [0002] The invention relates to a negative electrode material for a lithium ion battery and a preparation method thereof, in particular to a porous silicon-carbon composite material for a lithium ion battery and a preparation method thereof. [0003] Background technique: [0004] Lithium-ion batteries are mainly composed of transition metal oxides with lithium-intercalated positive electrode materials, negative electrode materials, highly graphitized carbon, separator polyolefin microporous membranes, and electrolyte materials. 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 ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
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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