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Preparation method of lithium iron phosphate/carbon nanotube composite material

A technology of carbon nanotubes and lithium iron phosphate, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of uneven carbon coating and low tap density, and achieve uniform carbon coating and tap density High, uniform effect

Active Publication Date: 2014-05-21
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects and problems of uneven carbon coating and low tap density in the prior art, and provide a lithium iron phosphate / carbon nanometer with uniform carbon coating and high tap density. Preparation method of pipe composite material

Method used

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  • Preparation method of lithium iron phosphate/carbon nanotube composite material
  • Preparation method of lithium iron phosphate/carbon nanotube composite material
  • Preparation method of lithium iron phosphate/carbon nanotube composite material

Examples

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Effect test

Embodiment 1

[0063] A preparation method of a lithium iron phosphate / carbon nanotube composite material, the preparation method sequentially includes a slurry preparation process, a slurry drying process, and a sintering process of a precursor powder, and the slurry contains carbon nanotubes;

[0064] The preparation process of the slurry: first stir the water-based carbon nanotube dispersion (the mass percentage concentration of carbon nanotubes is less than or equal to 10%) in a mixer to make the carbon nanotube dispersion change from a solidified state to a liquid state, and then to the carbon nanotube Add lithium source, iron source, phosphate, carbon source, water and stir to form slurry in tube dispersion liquid, the solid content of this slurry is 70 wt.%; The addition amount of described lithium source, iron source, phosphate, carbon source The solid phase reaction forms lithium iron phosphate with a carbon content of 2–4 wt.% as a standard; the carbon nanotubes account for 1 wt.% o...

Embodiment 2

[0068] The basic content is the same as in Example 1, except that carbon nanotubes account for 0.5wt.% of the total mass of carbon nanotubes, lithium source, iron source, phosphate, and carbon source.

Embodiment 3

[0070] The basic content is the same as in Example 1, except that the solid content of the slurry is 50 wt.%, and carbon nanotubes account for 10wt.% of the total mass of carbon nanotubes, lithium source, iron source, phosphate, and carbon source ( figure 2 is a scanned image of the composite).

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Abstract

The invention discloses a preparation method of a lithium iron phosphate / carbon nanotube composite material. The preparation method of the lithium iron phosphate / carbon nanotube composite material comprises the following steps: firstly stirring a water-based carbon nano tube dispersion liquid; then adding a lithium source, an iron source, phosphate, a carbon source and water, and stirring so as to form serum with certain consistency; then carrying out ball milling; then cooling and drying the serum after ball milling so as to prepare precursor powder containing a carbon tube; finally, sintering the precursor powder so as to obtain the lithium iron phosphate / carbon nanotube composite material. The design can guarantee that the prepared composite material not only is uniform in carbon coating layer and high in tap density, but also the carbon nano tube is dispersed among primary particles of a lithium iron phosphate material, and the electronic conductivity of the material can be improved greatly; the battery assembled by the composite material has a favorable electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium iron phosphate / carbon nanotube composite material, belongs to the field of battery materials, and is particularly suitable for improving the tap density of the lithium iron phosphate / carbon nanotube composite material and the uniformity of a carbon coating layer. Background technique [0002] Lithium iron phosphate has the advantages of high capacity, stable charging and discharging voltage, low price, good safety, good thermal stability, and no pollution to the environment. It is one of the most potential positive electrode materials for power batteries. However, lithium iron phosphate has two most obvious disadvantages: one is the low electronic conductivity, which limits its high rate application; the other is the low tap density, which leads to its low volume specific capacity. Carbon nanotubes are one-dimensional tubular structural materials rolled by graphite, which have a large aspect ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/625Y02E60/10
Inventor 王睿钟小华刘立炳
Owner DONGFENG COMML VEHICLE CO LTD
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