Silica-graphene composite negative electrode material and preparation method thereof

A graphene composite and silicon dioxide technology, applied in the field of lithium ion batteries, can solve the problems of high expansion rate of silicon-carbon multi-component composite negative electrode materials, poor doping uniformity, low tap density, etc., so as to improve liquid absorption and liquid retention. capacity, improve cycle performance, improve the effect of tap density

Active Publication Date: 2018-02-23
乌兰察布市大盛石墨新材料股份有限公司
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Problems solved by technology

Example (the Chinese patent application whose publication number is CN104037396A discloses a silicon-carbon multi-component composite negative electrode material and a preparation method thereof, the silicon-carbon multiple-component composite negative electrode material is composed of flexible graphite, nano-silicon and amorphous carbon, and the amorphous carbon is composed of The organic carbon source is obtained after high-temperature pyrolysis. Flexible graphite is obtained by applying pressure to expanded graphite. The prepared silicon-carbon multi-component composite negative electrode material has a high expansion rate, resulting in poor cycle performance, and the amorphous carbon material is directly coated with silicon. , but there are problems such as low tap density, poor binding force and poor doping uniformity.

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  • Silica-graphene composite negative electrode material and preparation method thereof
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  • Silica-graphene composite negative electrode material and preparation method thereof

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preparation example Construction

[0021] The invention provides a method for preparing a silicon dioxide-graphene composite negative electrode material, which comprises the following steps:

[0022] S1, dissolving organosilicate in an organic solvent to obtain a first mixed solution;

[0023] S2, adding an oxidizing agent, a pore forming agent and a graphene oxide solution to the first mixed solution, and mixing to obtain a second mixed solution;

[0024] S3, placing the second mixed solution in a high-pressure reactor, reacting at a temperature of 150°C to 200°C, and drying to obtain a porous silica / graphene oxide composite material, wherein during the reaction process The organosilicate decomposes to form silicon dioxide, and at the same time, a plurality of first pore structures are formed on the surface of the graphene oxide under the action of an oxidizing agent; and

[0025] S4, mixing the silica / graphene oxide composite material with a binder, coating it on the surface of copper foil, and performing he...

Embodiment 1

[0047] Step 1. Add 2g of isopropyl silicate to 10ml of N-methylpyrrolidone organic solvent and dissolve evenly;

[0048] Step 2: Add 3mL of 10% hydrogen peroxide, 3g of nano-potassium carbonate with a particle size of 500nm, and then add 2000mL of graphene oxide solution with a concentration of 5mg / mL, and disperse uniformly by ultrasonic to obtain the second mixed solution;

[0049] In step 3, the second mixed solution is transferred to an autoclave, reacted at 180°C for 3h, then filtered, and dried at 50°C for 24h to obtain a porous silica / graphene oxide composite material;

[0050] In step 4, 90g of silica / graphene oxide composite material, 10g of polyvinylidene fluoride binder and 150mL of double distilled water were mixed into a sticky paste and coated on the surface of copper foil. Then transfer to a tube furnace, feed ammonia and argon mixed gas with a volume ratio of 1:1, heat to 350°C for 3h, then raise the temperature to 850°C for 3h at a heating rate of 5°C / min, and...

Embodiment 2

[0052] Step 1. Add 1 g of bis(sec-butanol) orthosilicate triethyl orthosilicate aluminum salt to 10 mL of N,N-dimethylformamide organic solvent, and dissolve evenly;

[0053] Step 2: Introduce 10 mL of chlorine gas, 1 g of calcium oxide with a particle size of 0.5 μm, and then add 1000 mL of graphene oxide solution with a concentration of 10 mg / mL, and disperse evenly by ultrasonic to obtain a second mixed solution;

[0054] In step 3, the second mixed solution is transferred to a high-pressure reactor, and the temperature is 150° C. for 6 hours, then filtered, and dried at low temperature to obtain a porous silica / graphene oxide composite material;

[0055] In step 4, mix 90g of silica / graphene oxide composite material, 10g of vinylidene fluoride, and 150mL of double distilled water into a sticky paste and apply it on the surface of copper foil. Then transfer to a tube furnace, feed ammonia and argon mixed gas with a volume ratio of 1:1, heat to 300°C for 6 hours, then raise ...

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Abstract

The invention relates to a preparation method for a silica-graphene composite negative electrode material. The preparation method comprises the following steps: (1) dissolving organosilicate in an organic solvent to obtain a first mixed solution; (2) adding an oxidant, a pore-forming agent and a graphene oxide solution into the first mixed solution and carrying out mixing to obtain a second mixedsolution; (3) placing the second mixed solution in a high-pressure reactor, carrying out a reaction at a temperature of 150 to 200 DEG C and then carrying out drying to obtain a porous silica / grapheneoxide composite; and (4) mixing the silica / graphene oxide composite with a binder, coating the surface of a copper foil with the obtained mixture, and carrying out heat treatment in a reducing atmosphere so as to obtain the silica-graphene composite negative electrode material. The invention also provides the silica-graphene composite negative electrode material.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon dioxide-graphene composite negative electrode material and a preparation method thereof. Background technique [0002] The existing lithium-ion battery anode materials mainly use graphite. However, the theoretical specific capacity of graphite is only 372mAh / g. Therefore, the practical application of lithium-ion batteries as power batteries in the fields of transportation and energy storage is restricted. [0003] Silicon, silicon-based alloys and silicon oxides have high theoretical specific capacity and good safety, and are ideal substitute materials for lithium-ion battery anode materials. Among them, silicon dioxide has the advantages of simple preparation, low cost and environmental friendliness, so it has become one of the research hotspots of silicon-based anode materials. However, due to the huge volume change of silicon dioxide in the process of lithium i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 张彬赵磊
Owner 乌兰察布市大盛石墨新材料股份有限公司
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