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Sodium ion battery composite positive material and preparation method thereof

A technology for sodium-ion batteries and composite cathode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as inability to uniformly disperse, difficult dispersion of carbon nanotubes, and limited applications

Inactive Publication Date: 2014-07-09
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, carbon nanotubes intertwined with each other are generally difficult to disperse. They are substances that cannot be uniformly dispersed in water or organic solvents, and the suspension is easy to agglomerate. This difficult to disperse property limits its application in many fields.

Method used

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  • Sodium ion battery composite positive material and preparation method thereof
  • Sodium ion battery composite positive material and preparation method thereof
  • Sodium ion battery composite positive material and preparation method thereof

Examples

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Embodiment 1

[0029] A composite cathode material for sodium-ion batteries, namely spherical amorphous FePO 4 Nanomaterials loaded on the surface of multi-walled carbon nanotubes to form FePO with core-shell structure 4 Composites with multi-walled carbon nanotubes in the shape of "corn cobs";

[0030] The spherical amorphous FePO 4 The diameter of nanomaterials is 10-20nm;

[0031] The shape of the multi-walled carbon nanotubes is a rod with a diameter of 80nm;

[0032] Among the above-mentioned composite cathode materials for sodium ion batteries, spherical amorphous FePO 4 Amount of nanomaterials and multi-walled carbon nanotubes, calculated by mass ratio, i.e. spherical amorphous FePO 4 Nanomaterials: 3:7 for multi-walled carbon nanotubes.

[0033] The preparation method of above-mentioned a kind of sodium-ion battery composite cathode material specifically comprises the following steps:

[0034] (1) Calculated by volume ratio, that is, the ratio of n-butanol: Triton X-100: cycloh...

Embodiment 1

[0044] Except not adding multi-walled carbon nanotubes, other synthetic steps are the same as in Example 1 to obtain pure FePO 4 spherical nanoparticles.

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Abstract

The invention discloses a sodium ion battery composite positive material and a preparation method. The sodium ion battery composite positive material is a maize-cob-shaped FePO4 and multiwall carbon nanotube composite material which is formed by loading a spherical amorphous FePO4 nano material on the surfaces of multiwall carbon nanotubes through non-covalent bonds. The preparation method comprises the steps of preparing a water-in-oil micro-emulsion from n-butyl alcohol, triton X-100, cyclohexane and deionized water, uniformly dispersing the multiwall carbon nanotubes in the oil-in-water micro-emulsion with Fe(NO3)3.9H2O to obtain a micro-emulsion containing the multiwall nanotubes and Fe(NO3)3.9H2O, adding an oil-in-water micro-emulsion with NH4H2PO4 into the obtained micro-emulsion to form the sodium ion battery composite positive material with good rate performance and high discharging specific capacity in a heterogeneous nucleation manner.

Description

technical field [0001] The invention relates to a composite positive material for a sodium ion battery and a preparation method thereof, in particular to a FePO formed by in-situ self-assembly 4 Multi-wall carbon nanotube composite material and preparation method thereof. Background technique [0002] In recent years, people have paid more and more attention to environmental protection and the development of renewable energy. Researchers from all over the world have tried to use lithium-ion batteries as medium and large energy storage units in electric vehicles, smart grids, and solar and wind energy storage systems. superior. Lithium-ion batteries have been widely used in mobile phones, tablet computers, and digital products due to their high energy density, good rate and cycle performance. Although lithium-ion batteries have many advantages, lithium resources are not abundant. Many lithium mines around the world are stored in remote or politically sensitive areas. The gr...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 张俊喜徐硕炯张世明谈天易博陈启萌刘瑶戴念维
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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