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Preparation method of high-performance lithium ion battery based on three-dimensional graphene bracket structure

A lithium-ion battery and support structure technology, which is applied in the direction of electrolyte storage battery manufacturing, electrode manufacturing, secondary batteries, etc., can solve the problems of reducing internal stress, achieve stress relief, simple and convenient operation, and avoid the effect of coating film preparation process

Inactive Publication Date: 2014-07-30
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this three-dimensional scaffold structure is hard and not flexible, it can only reduce the internal stress within a limited range.

Method used

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  • Preparation method of high-performance lithium ion battery based on three-dimensional graphene bracket structure
  • Preparation method of high-performance lithium ion battery based on three-dimensional graphene bracket structure
  • Preparation method of high-performance lithium ion battery based on three-dimensional graphene bracket structure

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preparation example Construction

[0028] The present invention relates to a kind of high-performance ion battery preparation method based on three-dimensional graphene support structure, and described preparation method is as follows:

[0029] Step 1: Clean the nickel sheet, copper sheet or nickel-copper alloy sheet ultrasonically with acetone, alcohol, and deionized water for 5-15 minutes respectively. After drying, put it into a 1.5kW microwave plasma chemical vapor deposition chamber and heat it to After 600-700 degrees, add 1100-1400 watts of microwave power, and at the same time feed 1-2sccm methane, keep the pressure at 20-30Torr, and treat with hydrogen plasma for 10-30 minutes. After the treatment, turn off the plasma and let the chamber Natural cooling to form a three-dimensional graphene scaffold;

[0030] Step 2: Take the three-dimensional graphene support out of the microwave plasma chemical vapor deposition chamber, put it into the magnetron sputtering chamber, use the lithium-ion battery electrod...

Embodiment 1

[0035]Embodiment 1 Put the nickel sheet through the standard cleaning into a 1.5kW ASTeX plasma-enhanced chemical vapor deposition system cavity, feed 100 sccm hydrogen, add 1200 watts of microwave power when the temperature increases to 650 degrees, and feed 1.5 sccm methane simultaneously, After 20 minutes of plasma treatment, turn off the microwave, let the cavity cool naturally, take out the sample, and use SEM to observe the three-dimensional graphene structure growing on the surface of the nickel sheet. Then put the three-dimensional graphene-nickel sheet into the magnetron sputtering chamber, pass in 10 sccm of argon gas to control the pressure at 2mTorr, add 50W RF power, sputter for 30 minutes, and then a layer will be covered on the surface of the three-dimensional graphene A silicon film of about 1 μm.

[0036] Afterwards, the silicon-three-dimensional graphene-nickel sheet was assembled in an argon glove box, in which porous polypropylene was used as a separator, a...

Embodiment 2

[0040] Embodiment 2 Put the nickel sheet through the standard cleaning into the chamber of the 1.5kW ASTeX plasma enhanced chemical vapor deposition system, put a quartz glass sheet (4cm * 4cm) under the nickel sheet to avoid direct contact with the molybdenum sheet, and feed 100sccm hydrogen , when the temperature increases to 650 degrees, add 1200 watts of microwave power, and at the same time pass through 1.5 sccm methane, turn off the microwave after 20 minutes of plasma treatment, let the cavity cool naturally, take out the sample and you can observe the surface of the nickel sheet with SEM Two-dimensional graphene (multilayers) grows. Then put the two-dimensional graphene-nickel sheet into the magnetron sputtering chamber, feed 10 sccm of argon gas to control the pressure at 2mTorr, add 50W RF power, sputter for 30 minutes, and then the two-dimensional graphene surface will be covered A silicon film of about 1 μm.

[0041] Afterwards, the silicon-two-dimensional graphen...

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Abstract

The invention provides a preparation method of a high-performance lithium ion battery based on a three-dimensional graphene bracket structure. The method comprises the steps of carrying out ultrasonic cleaning on a nickel piece, a copper piece or a nickel-copper alloy piece by acetone, alcohol and deionized water respectively in sequence, drying and then putting the dried piece into a microwave plasma chemical vapor deposition chamber; heating, filling the microwave plasma chemical vapor deposition chamber with methane, and carrying out plasma treatment by hydrogen to form a three-dimensional graphene bracket; after that, putting the three-dimensional graphene bracket into a magnetron sputtering cavity, filling the magnetron sputtering cavity with argon, and carrying out sputtering with a lithium ion battery electrode material as a target; and finally, assembling in an argon-filled glove box to obtain the battery, wherein multi-space polypropylene is taken as a diaphragm, and LiPF6 and mixed liquid of ethylene carbonate, dimethyl carbonate and diethyl carbonate is taken as electrolyte. After the method is adopted, the high-quality three-dimensional graphene structure is obtained for the first time, and three-dimensional graphene is high in electrical conductivity, is a flexible material, and is capable of effectively relieving stress caused by lithium ions in the charge and discharge processes and greatly increasing the transport rate of electrons and lithium ions.

Description

【Technical field】 [0001] The invention relates to a method for preparing a high-performance lithium-ion battery based on a three-dimensional graphene support structure. 【Background technique】 [0002] In recent years, lithium-ion batteries have been widely used in mobile electronic communication devices. With the large-scale application of mobile rechargeable batteries in electric vehicles and space stations, it is becoming more and more important to develop new high-energy storage, fast charging, and stable lithium-ion batteries. Since the theoretical capacity of silicon can reach 4200mAh g-1, and the discharge potential is as low as 0.4V, silicon is generally considered to replace the existing graphite electrode and become the next generation electrode material. However, since the volume expansion of silicon can reach 400% during the charging and discharging process of lithium ions, silicon electrodes are prone to cracks, resulting in a rapid decline in cycle performance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M4/1395
CPCH01M4/0426H01M4/1395H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 王春栋吴启辉瞿波
Owner QUANZHOU NORMAL UNIV
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