Graphene/nano silicon combined electrode plate and preparation method of same

A composite electrode and nano-silicon technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of complex electrode sheet technology, affecting battery power density, increasing electrode equivalent series resistance, etc.

Active Publication Date: 2013-04-10
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

[0005] The traditional process of preparing electrode sheets is relatively complicated, and the addition of a certain binder increases the equivalent series resistance of the electrode and affects the power density of the battery.

Method used

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  • Graphene/nano silicon combined electrode plate and preparation method of same

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preparation example Construction

[0032] The preparation method of the above-mentioned graphene / nano-silicon composite electrode sheet of an embodiment, comprises the steps:

[0033] S10, providing or preparing nano-silicon and graphite oxide.

[0034] The particle size of the nano-silicon is 20nm-60nm.

[0035] The nano-silicon can be commercially purchased nano-scale nano-silicon powder.

[0036] Graphite oxide is obtained by oxidation of natural flake graphite, and the specific steps are:

[0037] Add 0.5g of natural flake graphite with a mesh number of 100 mesh to 500 mesh into 11.5mL of concentrated sulfuric acid at 0°C, then add 1.5g of potassium permanganate, keep the temperature of the mixture below 10°C, stir for 2h, and then After stirring in a water bath for 24 h, 46 mL of deionized water was slowly added in an ice bath. After 15 minutes, add 140mL of deionized water (which contains 2.5mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow, and is suction filtered,...

Embodiment 1

[0059] (1) Purchase commercially available nano-scale nano-silicon powder, and provide 500 mesh natural flake graphite powder at the same time. Add 0.5g of 500 mesh graphite powder to 0°C, 11.5mL of concentrated sulfuric acid, then add 1.5g of potassium permanganate, keep the temperature of the mixture below 10°C, stir for 2h, then stir in a water bath at room temperature for 24h, then place in an ice bath Slowly add 46 mL of deionized water under the conditions. After 15 minutes, add 140mL of deionized water (which contains 2.5mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow, and is suction filtered, then washed with 250mL of 10% hydrochloric acid, suction filtered, and finally 60 ℃ vacuum drying for 48h to obtain graphite oxide.

[0060] (2) Mixed solution of graphene oxide and nano-silicon: adding graphite oxide into ethanol and ultrasonically exfoliating for 0.5 h to obtain a uniformly dispersed graphene oxide solution. According to ...

Embodiment 2

[0065] (1) Purchase commercially available nano-scale nano-silicon powder, and provide 300 mesh natural flake graphite powder at the same time. Add 0.5g of 300-mesh graphite powder into 11.5mL of concentrated sulfuric acid at 0°C, then add 1.5g of potassium permanganate, keep the temperature of the mixture below 10°C, stir for 2h, then stir in a water bath at room temperature for 24h, then place in an ice bath Slowly add 46 mL of deionized water under the conditions. After 15 minutes, add 140mL of deionized water (which contains 2.5mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow, and is suction filtered, then washed with 250mL of 10% hydrochloric acid, suction filtered, and finally 60 ℃ vacuum drying for 48h to obtain graphite oxide.

[0066] (2) Mixed solution of graphene oxide and nano-silicon: graphite oxide was added into isopropanol and ultrasonically peeled for 0.8 h to obtain a uniformly dispersed graphene oxide solution. Accordi...

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Abstract

The invention discloses a graphene / nano silicon combined electrode plate. The combined electrode plate comprises a current collector, graphene deposited on the surface of the current collector, and nano silicon dispersed on the surface of the graphene. According to the graphene / nano silicon combined electrode plate, the graphene and the nano silicon are directly deposited on the current collector. Compared with a traditional electrode plate added with an adhesive, the graphene / nano silicon combined electrode plate is lower in equivalent series resistance; and the power density of a battery can be effectively increased by use of the graphene / nano silicon combined electrode plate. The invention also provides a preparation method of the graphene / nano silicon combined electrode plate.

Description

【Technical field】 [0001] The invention relates to the field of new materials, in particular to a graphene / nano-silicon composite electrode sheet and a preparation method thereof. 【Background technique】 [0002] Since Andre K. Geim (Andre K. Geim) of the University of Manchester in the United Kingdom prepared graphene materials in 2004, due to its unique structure and photoelectric properties, it has received widespread attention. Single-layer graphite is considered an ideal material due to its large specific surface area, excellent electrical and thermal conductivity, and low thermal expansion coefficient. Graphene not only has a high lithium-intercalation capacity (theoretical capacity: ~700mAh / g, actual capacity: 400-500mAh / g), but also has very good charge-discharge cycle performance. It can be used as negative electrode material in lithium ion capacitors and lithium ion batteries. [0003] As the negative electrode material of lithium-ion batteries, it must have excell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/13H01M4/139
CPCY02E60/10
Inventor 周明杰吴凤王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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