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Lithium iron phosphate/carbon nano tube nanocomposite material for positive electrode material of lithium battery and preparation method of lithium iron phosphate/carbon nano tube nanocomposite material

A nanocomposite material, lithium iron phosphate technology, applied in nanotechnology for materials and surface science, battery electrodes, nanotechnology, etc., can solve the problem of uneven contact between catalyst and carbon source, incomplete coating of carbon nanotubes, Problems such as low conversion efficiency of carbon nanotubes, to achieve the effect of high completeness and uniformity, high conversion rate, and improved conductivity

Active Publication Date: 2017-08-25
JIANGXI DIBIKE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium iron phosphate / carbon nanotube nanocomposite material and a preparation method thereof for the positive electrode material of a lithium battery, so as to solve the problem of uneven contact between the catalyst and the carbon source, low conversion efficiency of the carbon nanotube, and the introduction of the catalyst. Incoming water and oxygen, incomplete and uneven coating of carbon nanotubes, effectively improving the electrochemical properties of lithium iron phosphate / carbon nanotube nanocomposites such as electrical conductivity, specific capacity and rate characteristics

Method used

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preparation example Construction

[0028] The present invention also discloses a preparation method of the lithium iron phosphate / carbon nanotube nanocomposite material for manufacturing the anode material of the aforementioned lithium battery, comprising the following steps:

[0029] Step (1): Preparation of catalyst-supported lithium iron phosphate slurry

[0030] Weigh the lithium salt, phosphorus salt, and iron salt according to the molar ratio Li:P:Fe=1:1:1, and add one or more catalyst precursors in iron, nickel, molybdenum, and magnesium salts at the same time, and iron, nickel The molar content of molybdenum is 2%-20%, the molar content of molybdenum is 2%-15%, and the molar content of magnesium is 25%-90%,; fully stir each component in the solvent, and adjust the pH value with alkali, Then add it to a hydrothermal reaction kettle and raise the temperature to 300°C-800°C for 1h-24h to prepare a catalyst-loaded lithium iron phosphate slurry;

[0031] Step (2): Preparation of lithium iron phosphate / carbo...

Embodiment 1

[0040] Step (1): Preparation of catalyst-supported lithium iron phosphate slurry

[0041] Weigh the lithium salt, phosphorus salt, and iron salt according to the molar ratio Li:P:Fe=1:1:1, and add one or more catalyst precursors in iron, nickel, molybdenum, and magnesium salts at the same time, and iron, nickel The molar content of molybdenum is 13%, the molar content of molybdenum is 12%, and the molar content of magnesium is 75%. Each component is fully stirred in the solvent, and the pH value is adjusted with alkali, and then added to the hydrothermal reaction kettle and heated to React at 800°C for 1 hour to prepare a catalyst-loaded lithium iron phosphate slurry.

[0042] Step (2): Preparation of lithium iron phosphate / carbon nanotube nanocomposite

[0043] The catalyst-loaded lithium iron phosphate slurry is atomized above the CVD through the spray equipment. The particle size of the atomized droplet is 1 micron. The atomized droplet enters the high-temperature reaction...

Embodiment 2

[0046] Step (1): Preparation of catalyst-supported lithium iron phosphate slurry

[0047] Weigh the lithium salt, phosphorus salt, and iron salt according to the molar ratio Li:P:Fe=1:1:1, and add one or more catalyst precursors in iron, nickel, molybdenum, and magnesium salts at the same time, and iron, nickel The molar content of molybdenum is 8%, the molar content of molybdenum is 10%, and the molar content of magnesium is 82%. Each component is fully stirred in the solvent, and the pH value is adjusted with alkali, and then added to the hydrothermal reaction kettle and heated to React at 300° C. for 24 hours to prepare catalyst-supported lithium iron phosphate slurry.

[0048] Step (2): Preparation of lithium iron phosphate / carbon nanotube nanocomposite

[0049] The catalyst-loaded lithium iron phosphate slurry is atomized above the CVD through the spray equipment. The particle size of the atomized droplets is 100 microns. The atomized droplets enter the high-temperature ...

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Abstract

The invention relates to a lithium iron phosphate / carbon nano tube nanocomposite material for a positive electrode material of a lithium battery and a preparation method of the lithium iron phosphate / carbon nano tube nanocomposite material. The composite material is prepared from lithium iron phosphate and a carbon nano tube shell, and is specifically prepared by the steps of fully stirring a lithium iron phosphate precursor and a catalyst precursor in a solvent evenly, adjusting the pH value by using alkali, adding the mixture to a hydrothermal reactor, heating the mixture to 500 DEG C and reacting for 12h to prepare catalyst-loaded lithium iron phosphate slurry; and atomizing the catalyst-loaded lithium iron phosphate slurry on CVD through a spray device, catalyzing a gas carbon source into a carbon nano tube under the conditions of a high temperature and an inert gas and coating on the surface of the lithium iron phosphate to obtain the lithium iron phosphate / carbon nano tube nanocomposite material. The material has relatively high electrochemical properties, such as the electrical conductivity, the specific capacity and the rate capability, and can be widely applied to the positive electrode materials of an electric vehicle lithium battery and a mobile phone lithium battery.

Description

technical field [0001] The invention relates to a lithium battery cathode material, in particular to a lithium iron phosphate / carbon nanotube nanocomposite material used for the lithium battery cathode material and a preparation method thereof. Background technique [0002] Olivine-type lithium iron phosphate is considered to be a new lithium-ion battery cathode material with broad application prospects due to its abundant raw material sources, low price, good thermal stability, and excellent cycle performance. battery. As people's demand for fast charging of electric vehicles and mobile phones increases, lithium-ion batteries need to have a higher rate, which is currently difficult to achieve due to the low conductivity of lithium iron phosphate. [0003] In order to improve the conductivity of lithium iron phosphate, the method of carbon coating is widely used at present. On the one hand, it can improve the conductivity of lithium iron phosphate, and at the same time, it ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5825H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 彭枭雄
Owner JIANGXI DIBIKE
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