Carbon nanotube limited range selenium composite anode material and preparation method thereof

A technology of composite cathode material and carbon nanotubes

Active Publication Date: 2019-02-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the selenium in the modified carbon nanotube material is also only used as a surfactant for carbon nanotubes, and does not enter the interior of carbon nanotubes, and it is not used as a battery material
[0006] CN104201349A discloses a preparation method of a selenium carbon electrode material with a porous structure, the method introduces the carbon material into the selenium positive electrode material, but fails to solve the problem of volume expansion of the selenium positive electrode material in the process of charging and discharging to the greatest extent

Method used

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  • Carbon nanotube limited range selenium composite anode material and preparation method thereof
  • Carbon nanotube limited range selenium composite anode material and preparation method thereof
  • Carbon nanotube limited range selenium composite anode material and preparation method thereof

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Embodiment 1

[0033] In the composite positive electrode material, the elemental selenium nanoparticles are confined in the one-dimensional nanospace of the carbon nanotubes with a mass ratio of 4:1; the diameter of the carbon nanotubes is 5-20nm; the elemental selenium nanoparticles The particle size is 5-10 nm, and the elemental selenium nanoparticles are smaller than the diameter of the confined carbon nanotubes.

[0034] Such as figure 1 As shown, the carbon nanotube-confined selenium composite positive electrode material of the embodiment of the present invention contains selenium and carbon elements, and does not contain impurities (during EDS detection, the sample is placed on a copper micro-grid, so it shows copper elements, not impurities).

[0035] Such as figure 2 As shown, in the carbon nanotube-confined selenium composite positive electrode material of the embodiment of the present invention, the carbon nanotubes are evenly distributed without agglomeration, and the diameter ...

Embodiment 2

[0043] In the composite positive electrode material, the elemental selenium nanoparticles are confined in the one-dimensional nanospace of the carbon nanotubes with a mass ratio of 3:2; the diameter of the carbon nanotubes is 20-25nm; the elemental selenium nanoparticles The particle size of the selenium is 10-15nm, and the nanometer particle of the elemental selenium is smaller than the diameter of the confined carbon nanotube.

[0044] After testing, the carbon nanotube-confined selenium composite positive electrode material of the embodiment of the present invention contains selenium and carbon elements, and does not contain impurities.

[0045] After testing, in the carbon nanotube-confined selenium composite positive electrode material of the embodiment of the present invention, the carbon nanotubes are evenly distributed without agglomeration, and the diameter of the carbon nanotubes is 20-25 nm.

[0046] After testing, in the carbon nanotube-confined selenium composite ...

Embodiment 3

[0053] In the composite positive electrode material, the elemental selenium nanoparticles are confined in the one-dimensional nanospace of the carbon nanotubes with a mass ratio of 2:3; the diameter of the carbon nanotubes is 25-30 nm; the elemental selenium nanoparticles The particle size of the particles is 15-20 nm, and the elemental selenium nanoparticles are smaller than the diameter of the confined carbon nanotubes.

[0054] After testing, the carbon nanotube-confined selenium composite positive electrode material of the embodiment of the present invention contains selenium and carbon elements, and does not contain impurities.

[0055] After testing, in the carbon nanotube-confined selenium composite cathode material of the embodiment of the present invention, the carbon nanotubes are evenly distributed without agglomeration, and the diameter of the carbon nanotubes is 25-30 nm.

[0056] After testing, in the carbon nanotube-confined selenium composite positive electrode...

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Abstract

The invention discloses a carbon nanotube limited range selenium composite anode material and a preparation method thereof. In the composite anode material, elemental selenium nanoparticles are limited within a nano space of a one-dimensional limited range of carbon nanotubes at a mass ratio of (0.5-5.0):1. The preparation method comprises the following steps: (1) putting the carbon nanotubes intoa strong acid, stirring, and carrying out heating purification treatment to obtain purified carbon nanotubes; (2) grinding the purified carbon nanotubes obtained in the step (1) with selenium powder,sufficiently mixing, and carrying out low-temperature thermal treatment in a protective atmosphere to obtain the carbon nanotube limited range selenium composite anode material. The carbon nanotube limited range selenium composite anode material disclosed by the invention is capable of inhibiting volume expansion and a shuttling effect, and is high in discharge specific capacity and excellent inhigh magnification charge/discharge performance and circulation performance; and the method disclosed by the invention is simple in process, low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a composite positive electrode material and a preparation method thereof, in particular to a carbon nanotube confined selenium composite positive electrode material and a preparation method thereof. Background technique [0002] In the lithium-ion secondary battery system, the cathode material has always been the bottleneck restricting the development of the battery, and its specific capacity, rate performance and cycle performance need to be further improved. Traditional cathode materials such as LiCoO 2 , LiNiO 2 , LiMn 2 o 4 and LiFePO 4 etc., limited by its theoretical lithium storage capacity, it is difficult to make a breakthrough in the energy density of lithium-ion batteries even if the composition and process of these cathode materials are improved. Therefore, it is particularly urgent and important to develop new cathode materials for lithium-ion batteries with high energy density, long cycle life, and excellent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 喻万景易旭张福勤张宝廖寄乔戴琼雨何文洁童汇胡生勇郑俊超张佳峰
Owner CENT SOUTH UNIV
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