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Preparation method for negative electrode active materials and capacitors

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

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

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Problems solved by technology

However, this electrochemical hybrid capacitor suffers from low energy density

Method used

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  • Preparation method for negative electrode active materials and capacitors
  • Preparation method for negative electrode active materials and capacitors
  • Preparation method for negative electrode active materials and capacitors

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preparation example Construction

[0019] see figure 1 , the preparation method of the negative electrode active material of an embodiment, comprises the following steps:

[0020] Step S12, placing 160-200 parts by mass of graphite oxide powder in an atmosphere of tetramethylsilane.

[0021] In this embodiment, the reaction is carried out in a tube furnace.

[0022] Step S14, heat up the graphite oxide powder to 200-1200°C at a heating rate of 10-100°C / min, and then keep it warm for 1-10 hours to obtain a powder mixture, and pass 3.125-62.5 parts by mass of tetramethylsilane during the heat preservation period .

[0023] Step S16, cooling the powder mixture to room temperature in a reducing atmosphere to obtain a negative electrode active material.

[0024] In this embodiment, the reducing atmosphere is a hydrogen atmosphere.

[0025] In this embodiment, natural cooling is adopted when cooling the powder mixture to room temperature.

[0026] The preparation method of the above-mentioned negative electrode ...

Embodiment 1

[0041] 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.

[0042] Negative electrode: (1) Put 200 parts of graphite oxide powder into a tube furnace with tetramethylsilane, raise the temperature of the tube furnace to 1000 °C at a heating rate of 50 °C / min, and heat for 5 hours to obtain a powder mixture, Feed within 5h, feed 3.125 parts by mass of tetramethylsilane during the heat preservation period, then cool the powder mixture to room temperature in a hydrogen atmosphere to obtain a negative active electrode with a mass ratio of silicon nanowires to graphene of 1:99 Material; (2) The neg...

Embodiment 2

[0047] Positive electrode: active carbon and lithium iron phosphate material with a mass ratio of 70:30 are prepared as the positive electrode active material. The prepared positive electrode active material is mixed with a binder (PVDF) and a conductive agent (conductive carbon black super P) in a mass ratio of 90:5:5 to form a positive electrode material, and a solvent (NMP) is added 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.

[0048] Negative electrode: (1) Put 160 parts of graphite oxide powder into a tube furnace with tetramethylsilane, raise the temperature of the tube furnace to 1200 °C at a heating rate of 100 °C / min, and heat for 10 hours to obtain a powder mixture, Pass into 62.5 parts of quality tetramethylsilane during the heat preservation period, then the powder mixture is cooled to room temperature in a hydrogen a...

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Abstract

Disclosed is a preparation method for negative electrode active materials. The preparation method for negative electrode active materials includes the steps of firstly placing 160-200 parts (by mass) of graphite oxide power in the atmosphere of tetramethylsilane, secondly heating the graphite oxide power to 200-1200 DEG C by heating speed of 10-100 DEG C per minute, obtaining a power mixture after the thermal insulation of the heated graphite oxide power for 1-10 hours, and replenishing 3.125-62.5 parts (by mass) of tetramethylsilane into the graphite oxide power during the thermal insulation period, thirdly cooling the power mixture to room temperature in the reducing atmosphere, and finally obtaining the negative electrode active materials. The preparation method for the negative electrode active materials is simple in processing, and the prepared negative electrode active materials are of high energy density. Besides, the preparation method for capacitors which use the negative electrode active materials is also 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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