Silicon-carbon negative electrode material of lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as deterioration, electrode material pulverization, poor battery cycle performance, etc., and achieves easy operation, low cost, and preparation technology. simple effect

Active Publication Date: 2012-03-28
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large volume change of the silicon carbon negative electrode in the process of lithium intercalation and deintercalation can easily lead to the pulverization of the electrode material and the deterioration of the electrode performance, and the cycle performance of the battery is poor.

Method used

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  • Silicon-carbon negative electrode material of lithium ion battery and preparation method thereof
  • Silicon-carbon negative electrode material of lithium ion battery and preparation method thereof
  • Silicon-carbon negative electrode material of lithium ion battery and preparation method thereof

Examples

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preparation example Construction

[0014] The preparation method of the lithium-ion battery silicon-carbon negative electrode material of the present invention obtains the required lithium-ion battery silicon-carbon negative electrode material through the steps of nano-silicon powder, chemical vapor deposition, coating and roasting, and mixing, and specifically includes the following steps:

[0015] 1. To prepare ultra-fine and nano precursor silicon powder, 2-8% of catalyst, 2-10% of soluble organic carbon, 82-95% of particle size of 1-5 μm, and purity of 99.9% or more are prepared according to mass percentage Elemental coarse silicon powder and absolute ethanol, control the mass solid content to 5-30%, pour it into a nano-sand mill for closed grinding, the nano-grinder first performs wet ball milling at a speed of 1850rpm for 25-30 hours, and then ball mills at a low speed 1~3h, the rotation speed is 500~800rpm, and then take the material into the ultrasonic disperser for ultrasonic vibration for not less than...

Embodiment 1

[0025] Example 1, the high-purity elemental coarse silicon powder with an average particle size of 1 to 5 μm weighed 100 g, which was 91% of the total design ingredients, and dissolved it in absolute ethanol; weighed 2% of the total weight of the material Catalyst nickel acetate, soluble organic carbon glucose accounting for 7% of the total weight of the material, adding absolute ethanol to control its solid content to 20%, pouring it into a high-energy nano grinder for closed ball milling. The high-energy mill performs wet ball milling at a speed of 1850rpm for 25 hours, and then conducts ball milling at a low speed of 500rpm for 2 hours, and then takes the material into an ultrasonic disperser for ultrasonic vibration for 30 minutes. The ultrasonic vibration frequency is 30KHz and the power density is 1.0W / cm 2 . The silicon micron powder is dried by drying equipment, and the precursor powder with a particle size of 8-12um is prepared. After heating up to 460°C at a heating...

Embodiment 2

[0031] Example 2, the high-purity elemental coarse silicon powder with an average particle size of 1 to 5 μm weighed 100 g, which was 93% of the total design ingredients, and dissolved it in absolute ethanol; weighed 3% of the total weight of the material Catalyst nickel acetate, soluble organic carbon glucose accounting for 4% of the total weight of the material, adding absolute ethanol to control its solid content to 20%, pouring it into a high-energy grinder for closed ball milling. The high-energy mill performs wet ball milling at a speed of 1850rpm for 25 hours, and then conducts ball milling at a low speed of 600rpm for 2 hours, and then takes the material into an ultrasonic disperser for ultrasonic vibration for 30 minutes. The ultrasonic vibration frequency is 30KHz and the power density is 1.0W / cm 2 . Drying equipment is used for powder making, wherein the precursor powder with a particle size of 8-15 um is prepared. After heating up to 460°C at a heating rate of 3°C...

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Abstract

The invention discloses a silicon-carbon negative electrode material of a lithium ion battery and a preparation method thereof, and solves the technological problem of improving the charge and discharge cycling stability of the electrode material. The silicon-carbon negative electrode material is prepared by mixing a silicon-carbon composite material and a natural graphite material, wherein the weight of the silicon-carbon composite material is 7-20% and the silicon-carbon composite material is prepared by depositing carbon nanotube and/or carbon nanofiber on the surface of nanometer silica fume and/or embedding into the nanometer silica fume to form core, the surface of which is covered with 3-15wt% of a carbon layer. The preparation method provided by the invention comprises steps of: precursor silicon powder preparation; chemical vapor deposition; liquid-coating roasting; crushing; and mixing. In comparison with the prior art, the reversible specific capacity of the silicon-carbon composite negative electrode material is greater than 500mAh/g; the coulombic efficiency for a first cycle is greater than 80%; the capacity conservation rate of cycling for 50 weeks is greater than 95%. The preparation method is simple, is easy to operate, requires low cost and is suitable for a high-volume negative electrode material of lithium ion batteries used for various portable devices.

Description

technical field [0001] The invention relates to a battery negative electrode material and a preparation method thereof, in particular to a high-capacity lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] At present, a large number of commercial lithium-ion batteries use graphite-based carbon materials as negative electrode materials, but due to the low mass specific capacity of graphite-based carbon materials (the theoretical value is 372mAh / g, the actual capacity is 330-360mAh / g) and Poor high rate charge and discharge performance, especially the volume specific capacity is quite limited. Therefore, there is very little space for further improving its specific capacity, which is far from meeting the needs of future high-capacity and long-life electronic equipment. In recent years, metal and alloy materials are new and efficient lithium storage anode material systems that have been studied more, among which pure m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCY02E60/12Y02E60/10
Inventor 岳敏侯贤华李胜黄友元刘祥
Owner BTR NEW MATERIAL GRP CO LTD
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