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Method for preparing nitrogen-doped graphene supported carbon-coated silicon-based composite negative electrode material for lithium ion battery

A nitrogen-doped graphene and negative electrode material technology, applied in the field of electrochemical materials and new energy, can solve the problems that are not conducive to large-scale production of materials, increase the pressure of the inner tank of the reactor, and the low output of the hydrothermal reaction method. Achieve excellent cycle performance, facilitate uniform dispersion, and good reproducibility

Inactive Publication Date: 2018-09-18
CHINA AVIATION LITHIUM BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using hydrothermal reaction, the reproducibility is poor; in addition, the hydrothermal reaction is carried out under high temperature and pressure, (NH 4 ) 2 CO 3 Decomposition produces ammonia and carbon dioxide, which will increase the pressure of the inner tank of the reactor, which is dangerous
At the same time, the yield of the hydrothermal reaction method is low, which is not conducive to large-scale production of materials

Method used

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  • Method for preparing nitrogen-doped graphene supported carbon-coated silicon-based composite negative electrode material for lithium ion battery
  • Method for preparing nitrogen-doped graphene supported carbon-coated silicon-based composite negative electrode material for lithium ion battery

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Effect test

Embodiment 1

[0026] Dissolve 0.015mmol of column[5]arene in 30mL of deionized water with stirring, then continue to add it to the graphene oxide solution (30mL) containing 1.2mol under stirring, and stir for 2h to obtain supramolecularly modified Graphene oxide solution (NSM-GO). 11.2 g of nano-silica powder was dispersed in 80 mL of deionized water under ultrasonic conditions, and then added dropwise into the NSM-GO mixed solution. The above mixed solution was transferred to a 250 mL round bottom flask, 10 mL of hydrazine hydrate was added, and the reaction was refluxed at 80° C. for 8 h while stirring. The obtained product was collected by centrifugation, and a graphene-supported silicon material was obtained after vacuum drying. The above graphene-supported silicon material is placed in a tube furnace, and nitrogen is introduced as a protective gas at a gas flow rate of 200mL / min. After the temperature is raised to 800°C, a mixed gas of acetylene / nitrogen with a volume ratio of 1:10 is...

Embodiment 2

[0028] Dissolve 0.06 mmol of column [5] aromatics in 30 mL of deionized water with stirring, then continue to add it to the graphene oxide solution (30 mL) containing 1.2 mol under stirring, and stir for 2 h to obtain supramolecularly modified Graphene oxide solution (NSM-GO). 16.8 g of nano-silica powder was dispersed in 80 mL of deionized water under ultrasonic conditions, and then added dropwise into the NSM-GO mixed solution. The above mixed solution was transferred to a 250 mL round bottom flask, 10 mL of hydrazine hydrate was added, and the reaction was refluxed at 80° C. for 8 h while stirring. The obtained product was collected by centrifugation, and a graphene-supported silicon material was obtained after vacuum drying. The above-mentioned graphene-supported silicon material was placed in a tube furnace, and nitrogen gas was introduced as a protective gas at a gas flow rate of 200 mL / min. After the temperature was raised to 800°C, an acetylene / nitrogen mixed gas with...

Embodiment 3

[0031]Dissolve 0.06 mmol of column [5] aromatics in 30 mL of deionized water with stirring, then continue to add it to the graphene oxide solution (30 mL) containing 1.2 mol under stirring, and stir for 2 h to obtain supramolecularly modified Graphene oxide solution (NSM-GO). 16.8 g of nano-silica powder was dispersed in 80 mL of deionized water under ultrasonic conditions, and then added dropwise into the NSM-GO mixed solution. The above mixed solution was transferred to a 250 mL round bottom flask, 10 mL of hydrazine hydrate was added, and the reaction was refluxed at 80° C. for 8 h while stirring. The obtained product was collected by centrifugation, and a graphene-supported silicon material was obtained after vacuum drying. The above-mentioned graphene-supported silicon material was placed in a tube furnace, and nitrogen was introduced as a protective gas at a gas flow rate of 200 mL / min. After the temperature was raised to 700°C, a mixed gas of acetylene / nitrogen with a ...

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Abstract

The invention belongs to the fields of electrochemical materials and new energies, and discloses a lithium ion battery negative electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) introducing water-soluble nitrogen-containing supramolecular pillar[5]arene into a graphene oxide solution to obtain a supramolecule modified graphene oxide mixed solution; (2) introducing nano-silicon powder into the mixed solution, and performing a liquid phase reduction technology to obtain a graphene-supported silicon material; and (3) coating the productobtained in step (2) with carbon to obtain the nitrogen-doped graphene-supported carbon-coated silicon-based composite negative electrode material. The negative electrode material has a high electrochemical lithium storage capacity and excellent cycle performances, and has potential application prospects in the field of high performance lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of electrochemical materials and new energy, and in particular relates to a preparation method of a carbon-coated silicon-based composite negative electrode material supported by nitrogen-doped graphene for a lithium-ion battery. Background technique [0002] According to the "Medium and Long-Term Development Plan for the Automobile Industry" released in April 2017, by 2020, the energy density of lithium-ion power batteries must reach more than 300Wh / kg; by 2025, the energy density must reach more than 350Wh / kg. At present, the energy density of liquid lithium-ion power batteries composed of high-voltage layered transition metal oxides and graphite used as positive and negative electrode active materials in the market is generally below 240Wh / kg, and the capacity of graphite negative electrodes is very close to the theoretical capacity. There is room for improvement. limited. To achieve the planned energy density, it...

Claims

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Application Information

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IPC IPC(8): H01M4/36
CPCH01M4/362Y02E60/10
Inventor 叶剑波陈晓铭李利淼宋文锋怀永建
Owner CHINA AVIATION LITHIUM BATTERY RES INST CO LTD
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