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Silicon embedded redox graphene/graphite phase carbon nitride composite material, preparation and application thereof

A technology of graphitic carbon nitride and composite materials, applied in the field of lithium ion batteries, can solve the problems of increasing graphene/carbon nitride sheet spacing, poor chemical stability, separation and the like

Active Publication Date: 2018-01-26
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose and task of the present invention is to overcome the shortcomings of the poor electronic conductivity and poor chemical stability of the silicon material in the prior art, which easily cause the separation of the silicon active center and the matrix material in the subsequent cycle process, and provide a silicon material with good electrochemical desorption. A silicon-embedded redox graphene / graphite phase carbon nitride composite material with reversible lithium intercalation properties and its preparation method and application, using ultrasonic vibration to shrink the van der Waals bonds between the sheets, increasing the interlayer spacing of graphene / carbon nitride, Using the electrostatic self-assembly behavior of surface-treated nano-silicon spheres in a static state, a silicon-embedded redox graphene / graphite-phase carbon nitride composite system with good electrochemical lithium deintercalation reversibility was prepared

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  • Silicon embedded redox graphene/graphite phase carbon nitride composite material, preparation and application thereof
  • Silicon embedded redox graphene/graphite phase carbon nitride composite material, preparation and application thereof
  • Silicon embedded redox graphene/graphite phase carbon nitride composite material, preparation and application thereof

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Embodiment 1

[0045] A method for preparing a silicon-embedded redox graphene / graphite phase carbon nitride composite material comprises the following steps:

[0046] S1. Add 5 g of urea and 0.5 g of graphene oxide into 100 mL of alcohol / water mixed solution (the volume ratio of ethanol: water is 1:2), and stir until all the liquid is volatilized to obtain a uniform mixture of urea / graphene oxide;

[0047] S2. Move the mixture of 5.5 g of urea / graphene oxide obtained in step S1 into a tube furnace fed with argon / hydrogen standard gas, raise the temperature to 550° C. at a heating rate of 10° C. / min, and heat it for 2 hours. Cool to room temperature, the product obtained by the reaction is redox graphene / graphite phase carbon nitride composite matrix;

[0048] S3, adding 0.1g of dodecyltrimethylammonium bromide to 200mL of deionized water, and configuring dodecyltrimethylammonium bromide / water mixed solution (0.5g / L) for subsequent use;

[0049] S4, 2.0g silicon powder (average particle siz...

Embodiment 2

[0057] A method for preparing a silicon-embedded redox graphene / graphite phase carbon nitride composite material comprises the following steps:

[0058] S1. Add 5g of urea and 0.5g of graphene oxide into 50mL of alcohol / water mixed solution (volume ratio of ethanol: water is 1:1), and stir until all the liquid is volatilized to obtain a uniform mixture of urea / graphene oxide;

[0059] S2. Move the 5.5g urea / graphene oxide mixture obtained in step S1 into a tube furnace fed with argon / hydrogen standard gas, raise the temperature to 650°C at a heating rate of 20°C / min, and heat it for 0.5 hours. Cool to room temperature, the product obtained by the reaction is redox graphene / graphite phase carbon nitride composite matrix;

[0060] S3, adding 0.2g of dodecyltrimethylammonium bromide to 200mL of deionized water, and configuring dodecyltrimethylammonium bromide / water mixed solution (1.0g / L) for subsequent use;

[0061] S4, 0.7g silicon powder (average particle size is 40nm) is add...

Embodiment 3

[0066] A method for preparing a silicon-embedded redox graphene / graphite phase carbon nitride composite material comprises the following steps:

[0067] S1. Add 10g of urea and 0.4g of graphene oxide into 50mL of alcohol / water mixed solution (the volume ratio of ethanol:water is 1:4), and stir until all the liquid is volatilized to obtain a uniform mixture of urea / graphene oxide;

[0068] S2. Move the 10.4g urea / graphene oxide mixture obtained in step (1) into a tube furnace fed with argon / hydrogen standard gas, heat up to 650°C at a heating rate of 2°C / min, and keep it warm for 4 hours , furnace cooled to room temperature. The product obtained by the reaction is the redox graphene / graphite phase carbon nitride composite material.

[0069] S3. Add 0.02 g of polydiallyldimethylammonium chloride into 200 mL of deionized water, and prepare a polydiallyldimethylammonium chloride / water mixed solution (0.1 g / L) for later use.

[0070] S4, 1.0g silicon powder (average particle size...

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Abstract

The invention discloses a silicon embedded redox graphene / graphite phase carbon nitride composite material, preparation and application thereof. The silicon embedded redox graphene / graphite phase carbon nitride composite material comprises a redox graphene / graphite phase carbon nitride composite matrix serving as the base material, nano-silicon spheres that act as the active centre and are evenlydispersed and embedded in the lamellar gap of the redox graphene / graphite phase carbon nitride composite matrix, and a carbon layer that is located on the surfaces of the nano-silicon spheres and canstrengthen the chemical bonding force between the active centre and the base material. The silicon embedded redox graphene / graphite phase carbon nitride composite material provided by the invention has good electrochemical cycle performance, excellent compatibility and structural stability, can give play to good synergistic effect between the components, also has high batch stability, and is easyfor large-scale production.

Description

technical field [0001] The present invention relates to a silicon-embedded redox graphene / graphite-phase carbon nitride composite material and its preparation and application, in particular to a silicon-embedded redox graphene / laminated carbon nitride composite negative electrode system and a preparation method thereof. The invention discloses a silicon-based composite negative electrode system with high reversible capacity and good cycle performance, which can be used as the negative electrode material of lithium ion batteries, and belongs to the field of lithium ion batteries. Background technique [0002] Lithium-ion batteries have attracted much attention due to their advantages such as high specific energy, high operating voltage, wide temperature range, no pollution, and long storage life. As a green device for high-efficiency electrical energy storage and conversion, lithium-ion batteries are considered to be an ideal power source for small vehicles to truly achieve z...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 文钟晟王冠琴杨彦娥李嵩孙俊才季世军
Owner DALIAN MARITIME UNIVERSITY
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