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Preparation method and application of a halogen-doped carbon-silicon nanomaterial

A nano-material and silicon nano-technology, applied in the field of lithium-ion batteries, can solve problems such as difficult to meet the performance of high-performance lithium-ion batteries, complex preparation process, etc., and achieve excellent specific capacity performance, stable cycle performance, and high stability.

Active Publication Date: 2017-09-05
浙江星岳电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is to improve the electronic conductivity of silicon anode materials, and on the other hand, it is expected to alleviate the volume effect of silicon electrode materials during cycling, but the overall preparation process is complicated and it is difficult to meet the performance requirements of high-performance lithium-ion batteries.

Method used

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  • Preparation method and application of a halogen-doped carbon-silicon nanomaterial
  • Preparation method and application of a halogen-doped carbon-silicon nanomaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Evenly disperse 10g of silicon nanoparticles and 10g of carbon source into 200mL of ethanol solution, wherein the molar ratio of polyvinylidene fluoride, polyvinylidene chloride and polytetrafluoroethylene is 1:2:1, after stirring evenly, ball mill for 3 hours , put into 100 ℃ oven and dry for 12h. Finally, carbonize in a nitrogen atmosphere at a heating rate of 5°C / min, heat up to 800°C for 2 hours, and obtain a halogen-doped carbon-silicon nanomaterial after cooling.

[0022] Electrochemical performance test:

[0023] The prepared materials were uniformly mixed with Super P and PVDF in N-methylpyrrolidone solution at a mass ratio of 8:1:1, and then evenly coated on copper foil and dried in vacuum at 120 °C. With EC / DEC=1:1LiPF 6 It is the electrolyte, PP is the diaphragm, and the metal lithium sheet is the counter electrode. A button battery is made in a glove box filled with argon. Test the charge and discharge performance of the assembled battery on the LAND batt...

Embodiment 2

[0025] The preparation example 1 of the halogen-doped carbon-silicon nanomaterial is basically the same, except that the mixed sample is kept at 900° C. for 2 hours.

[0026] Battery performance testing method is identical with embodiment one, and the discharge specific capacity of gained battery is respectively about 1100mAh / g after cycling 300 circles under the electric current density of 500mA / g, is far higher than simple silicon nano material electrode material (450mAh / g ).

Embodiment 3

[0028] The preparation example 1 of halogen-doped carbon-silicon nanomaterials is basically the same, except that the mass ratio of silicon nanomaterials to carbon source is 1:2, and the polyvinylidene fluoride, polyvinylidene chloride and polytetrafluoroethylene added in the actual experiment The mass is 20g. The battery performance test method is the same as that of Example 1, and its discharge specific capacity and cycle relation curve are shown in figure 2 (B), the discharge specific capacity of the obtained battery after 300 cycles at a current density of 500mA / g is about 1300mAh / g, and the cycle stability is much higher than that of a single silicon nanomaterial (450mAh / g).

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Abstract

The invention relates to a preparation method of a halogen-doped carbon and silicon nano-material and an application thereof. The method comprises the steps that a carbon source with a specific structure is adopted, wrapping is conducted on the silicon nano-material through a simple mixing mode, and high temperature carbonization is further conducted to obtain the carbon and silicon nano-material with high specific capacity. When the obtained carbon and silicon nano-material is made to serve as an anode material of a lithium battery, the superior performance is achieved, the preparation method is simple, the cost is low, and wider prospect in the application field of lithium ion batteries for the high-performance carbon and silicon nano-material serving as the anode material is achieved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a simple and effective preparation method of a halogen-doped carbon-silicon nanometer material and its application as a lithium-ion battery negative electrode material. Background technique [0002] Lithium-ion batteries have become the main power source of various portable electronic products due to their superior cycle performance and high energy density. Graphite is currently the main anode material for commercial lithium-ion batteries. However, the theoretical specific capacity of graphite as an anode material for lithium-ion batteries is only 372mAh / g, which is difficult to meet the needs of various high-energy consumption electronic products today. Therefore, it is urgent to develop the next generation of new high-performance anode materials. Silicon has a high theoretical specific capacity (4200mAh / g) as an anode material for lithium-ion batteries, but in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/583H01M10/0525B82Y40/00
CPCH01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 顾宏伟
Owner 浙江星岳电子科技有限公司
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