Silicon-carbon composite material, lithium ion battery, and preparation method and application of silicon-carbon composite material

A silicon-carbon composite material and silicon powder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unsuitable preparation process, low charging and discharging efficiency, etc., so as to improve initial efficiency, low environmental pollution, and reduce volume the effect of expansion

Active Publication Date: 2014-03-12
SHANGHAI SHANSHAN TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of low charging and discharging efficiency of existing silicon-carbon composite materials and the preparation process is not suitable for industrial production, and provide a silicon-carbon composite material and its preparation method and use

Method used

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  • Silicon-carbon composite material, lithium ion battery, and preparation method and application of silicon-carbon composite material
  • Silicon-carbon composite material, lithium ion battery, and preparation method and application of silicon-carbon composite material
  • Silicon-carbon composite material, lithium ion battery, and preparation method and application of silicon-carbon composite material

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Effect test

Embodiment 1

[0048] The preparation method of embodiment 1 silicon carbon composite material

[0049] (1) After mixing 1Kg of silicon powder and 0.5Kg of silicon oxide powder evenly, add them to 15Kg of aqueous solution containing 22.5g of CMC and 22.5g of PVA for wet ball milling to D 50 The particle size is 200nm to obtain a slurry;

[0050] (2) Put the slurry, 7.5Kg D 50 Mesophase graphite with a particle size of 10 μm and 90 g of carbon nanofibers are evenly mixed and spray-dried. The inlet temperature of the spray dryer is controlled to be 250 ° C, the outlet temperature is 100 ° C, the frequency of the feeding plate is 15 Hz, and the frequency of the atomizing plate is 250 Hz. Obtain spherical particles;

[0051] (3) Mix the spherical particles with 1.0Kg of petroleum asphalt, and perform coating treatment at 400°C for 6 hours under nitrogen atmosphere to obtain the coated material;

[0052] (4) Carbonize the coated material in a carbonization furnace at 1000°C for 6 hours in a ni...

Embodiment 2

[0053] The preparation method of embodiment 2 silicon-carbon composite material

[0054] (1) After mixing 1Kg of silicon powder and 0.67Kg of silicon oxide powder evenly, add them to 15Kg of aqueous solution containing 3.0g of CMC and 3.0g of PVA for wet ball milling to D 50 The particle size is 50nm, and the slurry is obtained;

[0055] (2) Put the slurry, 4Kg D 50 The mesophase graphite with a particle size of 1 μm and 6g nano-carbon fiber are mixed evenly and spray-dried. The inlet temperature of the spray dryer is controlled at 220°C, the outlet temperature is 120°C, the frequency of the feeding tray is 20Hz, and the frequency of the atomizing tray is 300Hz. Obtain spherical particles;

[0056] (3) Mix spherical particles with 1.0Kg coal tar pitch, and carry out coating treatment at 500°C for 4 hours under a nitrogen atmosphere to obtain the coated material;

[0057] (4) Carbonize the coated material in a carbonization furnace at 1100° C. for 8 hours in a nitrogen atmos...

Embodiment 3

[0058] Embodiment 3 The preparation method of silicon-carbon composite material

[0059] (1) After mixing 1Kg of silicon powder and 0.25Kg of silicon oxide powder evenly, add them to 6.5Kg of aqueous solution containing 25g of CMC and 25g of PVA for wet ball milling to D 50 Particle diameter is 500nm, obtains slurry;

[0060] (2) Put the slurry, 3.75Kg D 50 Mesophase graphite with a particle size of 5 μm and 100 g of carbon nanofibers are evenly mixed and spray-dried. The inlet temperature of the spray dryer is controlled at 270 ° C, the outlet temperature is 90 ° C, the frequency of the feeding disc is 10 Hz, and the frequency of the atomizing disc is 280 Hz. Obtain spherical particles;

[0061] (3) Mix the spherical particles with 3.33Kg coal tar pitch, and carry out coating treatment at 500°C for 10 hours under nitrogen atmosphere to obtain the coated material;

[0062] (4) The coated material is carbonized in a carbonization furnace at 900° C. for 8 hours in a nitrogen ...

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Abstract

The invention discloses a silicon-carbon composite material, a lithium ion battery, and a preparation method and application of the silicon-carbon composite material. The preparation method of the silicon-carbon composite material comprises the steps: uniformly mixing silicon powder and silicon monoxide powder, then mixing with a solution containing an organic carbon source dispersant, and performing wet-process ball milling to obtain a slurry; uniformly mixing the slurry, graphite and a conductive agent, and performing spray drying to obtain spherical-like particles, wherein graphite is synthetic graphite and/or intermediate-phase graphite; mixing the spherical-like particles and asphalt, performing cladding processing under the inert atmosphere to obtain a cladded material; and then performing carbonizing processing to obtain the silicon-carbon composite material, wherein silicon powder, silicon monoxide powder, graphite and asphalt respectively accounts for 5-15%, 3-10%, 45-75% and 5-40% by weight of the sum of the above materials, and the organic carbon source dispersant and the conductive agent both accounts for 0.1-2% by weight of the sum of silicon powder, silicon monoxide powder and graphite. The silicon-carbon composite material has relatively good cycle performance, and can be directly used as a cathode material of the lithium ion battery. The preparation method is simple in technology, low in cost and applicable to industrial production.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a silicon-carbon composite material and its preparation method and application, and also relates to a lithium-ion battery containing the silicon-carbon composite material. Background technique [0002] At present, most commercial lithium-ion battery anode materials use graphite as raw material. However, the theoretical capacity of graphite is 372mAh / g, which cannot meet the increasing demand for high-energy-density lithium-ion batteries in today's market. It is urgent to develop a new type of high specific capacity. Lithium-ion battery anode material, and the theoretical capacity of silicon is 4200mAh / g, and the delithiation potential platform is low, so it has become one of the most promising lithium-ion battery anode materials. However, due to the huge volume change of silicon during the charging and discharging process, the material structure is rapidly pulverized and dest...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/38H01M4/587H01M10/0525
CPCY02E60/122H01M4/366H01M4/386H01M4/483H01M4/587H01M10/0525Y02E60/10
Inventor 董爱想沈龙乔永民谢秋生
Owner SHANGHAI SHANSHAN TECH CO LTD
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