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Preparation method of silicon-carbene material and preparation method of electrode active material of silicon-carbene material

A silicon carbene and electrode technology, applied in negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of heavy metal pollution, low yield, spontaneous combustion, etc., and achieve the effects of not easy doping, high yield, and low preparation temperature.

Active Publication Date: 2021-06-18
武汉楚能电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ternary cathode material battery will cause heavy metal pollution
The ternary cathode material battery has unexplained spontaneous combustion, which has been frequently exposed
[0008] The problem existing in the existing technology is that, using enhanced plasma combined with femtosecond strong laser, static magnetic field and bias technology to directly grow silicon atomic layer on graphene or use graphene and silicene to directly grow silicon carbonene, in the formation It is more difficult for sp3 hybridization bonds, and the yield is very low

Method used

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  • Preparation method of silicon-carbene material and preparation method of electrode active material of silicon-carbene material
  • Preparation method of silicon-carbene material and preparation method of electrode active material of silicon-carbene material
  • Preparation method of silicon-carbene material and preparation method of electrode active material of silicon-carbene material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] (1) Weigh 15g of pure graphite, mix it with metal gallium powder, pour it into the acetone solution in a vacuum stirrer and stir evenly, and seal and stir for 24 hours; Cake shape, pressed into the graphite boat, as a target, put the sample boat into the stainless steel shell reaction chamber, this reaction chamber has a reactant nozzle that produces high hydrogen dilute silane gas, located in the center of the reaction chamber directly above, here The chamber produces enhanced plasma, and the nozzle is 20cm away from the center of the bottom of the reaction chamber; at the top of the reaction chamber 10cm away from the center, there is a radio frequency magnetron sputtering gas nozzle with an angle θ=89~60 with the horizontal plane, and the electric field direction of the cathode and the anode Parallel, a strong electric field is formed between the sample base and the inert gas nozzle, and a voltage of 2000-20000V is applied during it;

[0080] (2) Vacuum up to 10 -4 ...

Embodiment 2

[0102](1) Weigh 5g of pure silicene, mix it with gallium metal powder, press it into a cake shape, put it into a graphite boat, and put the sample boat into a reaction chamber with a stainless steel shell. This reaction chamber has a high-hydrogen dilute methane gas The reactant nozzle is located in the center directly above the reaction chamber to generate enhanced plasma. The nozzle is 20cm away from the center of the bottom of the reaction chamber; there is a magnetron sputtering inert gas nozzle at the top 5-10cm away from the center, which can Adjust the silicene target aligned to the center of the sample boat;

[0103] (2) Vacuum up to 10 -3 mTorr;

[0104] (3) Heat the sample boat to 1000-1200°C;

[0105] (4) Turn on the inert gas high-purity argon spray gun to inject argon, aim at the target in the sample boat, keep the sputtering power at 90-200W, and the working pressure at 0.1-1mTorr to produce silicene nuclei or silicene quantum dots , turn on the plasma generat...

Embodiment 3

[0122] Electrodes were made from this silicene sample. The steps are: (1) Weigh the silicon carbene sample, PVDF and graphene conductive agent so that the weight percentage is (80-90): (10-5): (10-5), and put them in a stainless steel stirrer; (2) Add 5ml of nmp to the sample in the agitator, and stir evenly in the vacuum agitator for 72 hours; (3) After taking it out, apply it to the foamed nickel; (4) Put the foamed nickel in the central control drying box , dried at 120°C for 72 hours, and cooled to room temperature; (5) Take out the nickel foam coated with the silicene sample and press it into a sheet on a roller press to prepare 200 CR2025 electrode sheets. Assemble the 200 electrode sheets as button cells, the counter electrode is a lithium-sodium alloy metal sheet, add a diaphragm, pour lithium ion and sodium ion electrolyte, and contain NaPF6 ethyl carbonate; seal and make 200 CR2025 buttons Lithium-sodium alloy / silicon carbene (or silicon carbide) battery. After agi...

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Abstract

The invention relates to a preparation method of a silicon-carbene material and a preparation method of the electrode active material of the silicon-carbene material, wherein in order to improve the yield of silicon-carbene, when a carbon atom ring is grown, a silicon single atom layer is grown in a combined manner or a carbon single atom layer is grown on a silicon ring layer, so that a silicon carbene crystal is formed. According to the technology, an improved plasma reaction cavity and a magnetron sputtering method are used for directly conducting heat treatment at 800-1300 DEG C in the reaction process, when graphene crystal nucleuses are formed within a heating time, the graphene crystal nucleuses and silicon crystal nucleuses are subjected to self-assembly growth to form a three-layer structure with silicon atom layers clamping a carbon atom layer, and a large silicon carbide unit layer, also called silicon carbene, grows; and large-scale growing high-purity silicon carbene as electrode active material of a lithium-sodium alloy rechargeable battery has high specific energy and stable cycle characteristics. The invention also provides a preparation method of a silicon-carbene electrode active material. The silicon-carbene electrode active material has high specific energy and stable cycle characteristics, and can improve the energy density and power density of the lithium-sodium rechargeable battery.

Description

technical field [0001] The invention belongs to the technical field of rechargeable batteries, and in particular relates to a preparation method of a high specific energy, long life and stable electrode active material for rechargeable batteries—silicon carbene material and a preparation method applied to the electrode active materials of rechargeable batteries . Background technique [0002] At present, lithium-ion batteries are mainly lithium iron phosphate batteries and ternary cathode material batteries. The former needs to use phosphorus. If the current trend of rapid increase in electric vehicles is followed, the amount of phosphorus used in batteries will be large, competing with agricultural fertilizers for phosphorus. Phosphorus is a non-renewable resource that is essential for plants and animals. Once phosphorus is used according to the current trend, the earth will face a situation of phosphorus deficiency in 80 years. It will be a disaster for humans, animals ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/977B82Y40/00H01M4/587H01M4/133H01M4/134H01M4/38H01M4/1393H01M4/1395H01M10/0525H01M10/054
CPCC01B32/977B82Y40/00H01M4/587H01M4/133H01M4/134H01M4/386H01M4/1393H01M4/1395H01M10/0525H01M10/054H01M2004/027H01M2004/021C01P2002/20C01P2004/64C01P2004/136C01P2006/40Y02E60/10
Inventor 范例张洪涛范霄杰范毂豪张泽森
Owner 武汉楚能电子有限公司
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