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In-situ synthesis method for preparing tin-carbon/core-shell nano-particle fully filled carbon nano-tube composite anode material

A carbon nanotube composite and nanoparticle technology, applied in electrode manufacturing, battery electrodes, electrical components, etc., can solve the problems of uneven distribution, low product structure purity, low filling efficiency, etc., and improve the volume specific capacity and weight ratio. The effect of capacity

Inactive Publication Date: 2009-09-02
SHANGHAI UNIV
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Problems solved by technology

Since the diameter of carbon nanotubes has a nanoscale size, and the length can reach more than microns, the filling material obtained by this method of filling nanoparticles from the openings at both ends of carbon nanotubes by using capillary action is in the cavity of carbon nanotubes. The distribution is very uneven and the filling efficiency is not high. Many of the target filling materials do not enter the lumen of carbon nanotubes but are loaded on the outer surface of carbon nanotubes, resulting in low structural purity of the product

Method used

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  • In-situ synthesis method for preparing tin-carbon/core-shell nano-particle fully filled carbon nano-tube composite anode material
  • In-situ synthesis method for preparing tin-carbon/core-shell nano-particle fully filled carbon nano-tube composite anode material
  • In-situ synthesis method for preparing tin-carbon/core-shell nano-particle fully filled carbon nano-tube composite anode material

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Embodiment 1

[0016] A porous anodized aluminum film (pore size about 200nm) was placed in 1.0M SnCl 4 Place in the aqueous solution for 3 to 5 hours, then dry in an oven at 70°C for 5 hours, then place the aluminum oxide film in a tube furnace to heat, and feed 200 sccm with a volume percentage of 10% C 2 h 2 and 90%N 2 The mixed gas formed, after passing the mixed gas for 1 hour, began to heat up, heated to 650°C at a heating rate of 3-10°C / min, continued for 3 hours, continued to pass the mixed gas until the tube furnace naturally cooled to room temperature, and then used 6.0M Soak in NaOH aqueous solution for 1 hour to remove the aluminum oxide film, collect the remaining insoluble matter, wash with a large amount of deionized water, and dry the product. The final powder obtained is the product in which Sn@C core-shell nanoparticles are completely filled with carbon nanotubes. This product is in figure 1 Field Emission Scanning Electron Microscope (FESEM) images show that some nanopa...

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Abstract

The invention provides a method for preparing a tin-carbon / core-shell nano-particle fully filled carbon nano-tube composite anode material, which comprises the following steps: a porous anodic alumina film is placed in a stannic chloride water solution for soaking, is dried and then is subjected to chemical vapor deposition and reduction reaction in mixed gas of C2H2 and N2 at high temperature to obtain the tin-carbon / core-shell nano-particle fully filled carbon nano-tube composite anode material. The size and morphology of filled particles of the invention are controllable, the filling efficiency of the method is high, the structural purity of a target product can approach 100 percent, the interference of incomplete filling on the one-to-one correspondence of a structure and performance of the product is avoided, and the reversible lithium-storage capacity of the carbon nano-tube composite anode material with the novel structure can reach more than 700 mAh / g.

Description

technical field [0001] The invention relates to a synthesis method for in-situ synthesis of tin-carbon / core-shell nanoparticles fully filled carbon nanotube composite anode materials by chemical vapor deposition, and belongs to the technical field of chemical vapor deposition preparation of new composite materials and application of lithium-ion battery anode materials. Background technique [0002] Due to the advantages of large specific energy, high working voltage, small self-discharge, long cycle life, no memory, no pollution and environmental protection, lithium-ion batteries have gradually replaced traditional nickel-metal hydride and lead-acid batteries and are widely used to meet the needs of today's electronic information Mobile power requirements for different mobile electronic devices in different eras. Graphitized carbon materials are now widely used commercially as anode materials, which have excellent performance in multiple charge and discharge cycles, but thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36
CPCY02E60/12Y02E60/10
Inventor 王勇焦正吴明红陆燕许检红何雅琴
Owner SHANGHAI UNIV
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