Preparation method of cathode active material and preparation method of capacitor

A technology of negative electrode active material and positive electrode active material, which is applied in the field of capacitors and can solve the problems of low energy density of electrochemical hybrid capacitors

Inactive Publication Date: 2013-03-27
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this electrochemical hybrid capacitor suffers from low energy density

Method used

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  • Preparation method of cathode active material and preparation method of capacitor
  • Preparation method of cathode active material and preparation method of capacitor
  • Preparation method of cathode active material and preparation method of capacitor

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preparation example Construction

[0021] see figure 1 , the preparation method of the negative electrode active material of an embodiment, comprises the following steps:

[0022] Step S12, adding 60-100 parts by mass of graphite oxide into water for ultrasonic dispersion to form a uniformly dispersed graphene oxide solution with a concentration of 1 g / L.

[0023] In this embodiment, graphite oxide is added into water and ultrasonically dispersed for 1 hour to form a graphene oxide solution uniformly dispersed in a single sheet.

[0024] Step S14, adding 1 to 20 parts by mass of nano-silicon particles to the graphene oxide solution to form a suspension.

[0025] In this embodiment, the nano-silicon particles are added to the graphene oxide solution and then mechanically stirred to form a suspension.

[0026] Step S16 , placing the mixture obtained after removing the water in the suspension in a reducing atmosphere and raising the temperature to 200° C. to 1200° C., heating for 1 hour to 10 hours, and cooling ...

Embodiment 1

[0047] Positive electrode: The positive electrode active material activated carbon, binder (PVDF) and conductive agent (acetylene black) are mixed in a mass ratio of 85:10:5 to form a positive electrode material, and a solvent (NMP) is added to form a viscosity of 2500 Newton seconds / square meter Positive electrode slurry, the positive electrode slurry is coated on the aluminum foil, and then dried, rolled and cut to make the positive electrode.

[0048] Negative electrode: (1) Add 80g of graphite oxide into water and ultrasonically disperse to form a graphene oxide solution uniformly dispersed in a monolithic layer, add 20g of nano-silicon particles to the graphene oxide solution to form a suspension, remove the The mixture obtained after the water is placed in a reducing atmosphere and heated to 800° C. at a rate of 10° C. / min and heated for 5 hours. After cooling, a silicon-graphene composite material is obtained. The silicon-graphene composite material is mixed with 40 g of...

Embodiment 2

[0054] Positive electrode: active carbon and lithium iron phosphate material with a mass ratio of 70:30 are prepared as the positive electrode active material. Mix the prepared positive electrode active material with binder (PVDF) and conductive agent (conductive carbon black Super P) in a mass ratio of 85:5:10 to form a positive electrode material, and add a solvent (NMP) to form a viscosity of 1500 Ns / Square meters of positive electrode slurry, the positive electrode slurry is coated on aluminum foil, and then dried, rolled and cut to make positive electrodes.

[0055] Negative electrode: (1) Add 100g graphite oxide into water and ultrasonically disperse to form a graphene oxide solution uniformly dispersed in a monolithic layer, add 1g nano-silicon particles to the graphene oxide solution to form a suspension, remove the The mixture obtained after the water is placed in a reducing atmosphere and heated to 1200° C. at a rate of 100° C. / min. and then heated for 1 h. After co...

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Abstract

A preparation method of cathode active material includes the steps of firstly, adding 60-100 parts, by weight, of graphite oxide into water for ultrasonic dispersion so as to obtain evenly dispersed 1g/L graphite oxide solution; secondly, adding 1-20 parts of silicon nanoparticles into the graphite oxide solution to obtain suspension; thirdly, placing mixture obtained by dewatering the suspension in reducing atmosphere, raising the temperature to 200-1200 DEG C, heating for 1-10 hours, and cooling to obtain silicon-graphene composite; and fourthly, subjecting the silicon-graphene composite and 30-50 parts of carbon nanotubes to ball milling to obtain the cathode active material. The cathode active material prepared by the preparation method is high in energy density. In addition, a preparation method of a capacitor using the cathode active material is provided.

Description

【Technical field】 [0001] The invention relates to the field of capacitors, in particular to a preparation method of a negative active material and a preparation method of a capacitor using the negative active material. 【Background technique】 [0002] In the 1990s, the development of electric vehicles and the need for power pulse power supplies further stimulated research on electrochemical capacitors. At present, the specific energy of electrochemical capacitors is still relatively low, and the specific power of batteries is low. People are trying to solve this problem from two aspects: (1) When batteries and supercapacitors are used in combination, during normal operation, the batteries provide the required energy. The power; when starting or needing a large current discharge, it is provided by a capacitor. On the one hand, it can improve the shortcoming of the battery’s poor low-temperature performance; it can solve the application of pulse current with high power requirem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/00H01G9/042
CPCY02E60/13
Inventor 周明杰钟玲珑王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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