Preparation method of carbon nanotube and lithium iron phosphate composite positive electrode material

A composite positive electrode material, lithium iron phosphate technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of performance degradation, low electron and ion conductivity of lithium iron phosphate, and improve ion conductivity Low efficiency, simple process, uniform product compound effect

Inactive Publication Date: 2018-02-16
绵阳梨坪科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium iron phosphate has the disadvantages of low electronic and ionic conductivity, and a significant drop in performance during high-power charging and discharging.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh nickel carbonate, talcum powder and lithium iron phosphate powder according to the mass ratio of 1:10:100, add them into absolute ethanol, and grind for 30 minutes. Dry at 80°C to prepare a catalyst-loaded lithium iron phosphate carrier.

[0022] Spread the lithium iron phosphate carrier on the alumina substrate, the substrate is placed on the quartz boat, and the quartz boat is placed at the head end of the quartz tube of the tube furnace. Ar gas was passed through at a rate of 150 sccm for half an hour to remove the air in the tube.

[0023] Heat the tube furnace to 750°C, push the quartz boat to the center of the furnace, and after 5 minutes, adjust the Ar gas flow to 300 sccm, and inject cyclohexane at 15ml / h for 40 minutes. Stop the heating, cool down to normal temperature with the furnace under the protection of argon, take out the sample in the tube furnace, which is the LiFePO4 / CNT composite material.

Embodiment 2

[0025] Weigh ferrocene, talc powder and lithium iron phosphate powder according to 1:10:100, add to absolute ethanol, grind and stir for 30min. Dry at 60°C to prepare a catalyst-loaded lithium iron phosphate carrier.

[0026] Spread the lithium iron phosphate carrier on the alumina substrate, the substrate is placed on the quartz boat, and the quartz boat is placed at the head end of the quartz tube of the tube furnace. Ar gas was passed through at a rate of 500 sccm for half an hour to remove the air in the tube.

[0027] Heat the tube furnace to 850°C, push the quartz boat to the center of the furnace, and after 5 minutes, adjust the Ar gas flow to 300 sccm, and inject ethanol at 15ml / h for 30 minutes. Stop the heating, cool to normal temperature with the furnace under the protection of argon, take out the sample in the tube furnace, which is the LiFePO4 / CNT composite material.

Embodiment 3

[0029] Weigh ferric nitrate, nickel hydroxide, talcum powder and lithium iron phosphate powder according to 1:10:100, add to distilled water, grind and stir for 30 minutes. Dry at 60°C to prepare a catalyst-loaded lithium iron phosphate carrier.

[0030] Spread the lithium iron phosphate carrier on the alumina substrate, the substrate is placed on the quartz boat, and the quartz boat is placed at the head end of the quartz tube of the tube furnace. Ar gas was passed through at a rate of 500 sccm for half an hour to remove the air in the tube.

[0031] Heat the tube furnace to 750°C, push the quartz boat to the center of the furnace, and after 5 minutes, adjust the Ar gas flow to 300 sccm, and inject ethanol at 15ml / h for 40 minutes. After the heating is stopped, the furnace is cooled to normal temperature under the protection of argon, and the sample in the tube furnace is taken out, which is the LiFePO4 / CNT composite material.

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PUM

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Abstract

The invention provides a preparation method of a carbon nanotube and lithium iron phosphate composite positive electrode material, and belongs to the preparation field of an energy material. The preparation method comprises the steps of performing mixing on Fe, a Ni catalyst, talcum powder and lithium iron phosphate particles, performing catalytic cracking on a carbon source at a high temperature,and enabling carbon nanotubes to be grown on the surfaces of the particles to prepare the LiFePO<4>/CNT composite positive electrode material. By virtue of the preparation method, the shortcomings ofrelatively low electron and ion conductivity of lithium iron phosphate and obvious performance decline in high-power charging and discharging can be overcome; and in addition, the process is simple and the product is uniformly compounded, so that a novel positive electrode material is provided for the lithium battery, and the preparation method has certain application prospect.

Description

technical field [0001] The present invention relates to lithium-ion batteries, in particular to a lithium iron phosphate and carbon nanotube (LiFePO 4 / CNT) composite cathode materials. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, good cycle performance, no memory effect, wide operating temperature range, etc., and have great application prospects in the field of large power sources such as electric vehicles. Lithium iron phosphate (LiFePO) with olivine structure 4 ) The positive electrode material has the advantages of rich raw material sources, low price, no environmental pollution, high capacity (theoretical capacity 170mAh / g), etc., and has become a hot spot for current applications. [0003] Lithium iron phosphate has the disadvantages of low electronic and ionic conductivity, and a significant drop in performance during high-power charging and discharging. At present, the methods for improving the performance of lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 朱德康
Owner 绵阳梨坪科技有限公司
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