Lithium phosphate coated lithium iron phosphate electrode and preparation method thereof

A technology of coating lithium phosphate and lithium iron phosphate, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of low conductivity, complicated methods, and high cost, and achieve simple methods, high power, and reduced anisotropy Effect

Inactive Publication Date: 2013-06-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the low electronic conductivity of lithium iron phosphate, the existing methods for improving the conductivity are complicated, and the defects of high cost, one of the purposes of the present invention is to provide a lithium iron phosphate electrode coated with lithium phosphate, the lithium iron phosphate electrode The surface is coated with a layer of nano-scale glassy lithium phosphate, which can improve the electronic conductivity of the lithium iron phosphate electrode

Method used

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  • Lithium phosphate coated lithium iron phosphate electrode and preparation method thereof
  • Lithium phosphate coated lithium iron phosphate electrode and preparation method thereof
  • Lithium phosphate coated lithium iron phosphate electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] (1) Preparation of lithium phosphate target

[0042] Mix lithium phosphate powder with absolute ethanol, mill it in a ball mill at a speed of 400rpm for 5 hours, ball mill it into a slurry, place the slurry at 70°C for 48 hours in vacuum to obtain a powder, and make the powder into a 60mm-diameter ball by cold pressing The lithium phosphate target precursor was finally calcined in air at 600°C for 4h.

[0043] (2) Preparation of lithium iron phosphate electrode coated with lithium phosphate

[0044] Place the lithium iron phosphate electrode and lithium phosphate target as the substrate in the sputtering chamber of JGP450 ultra-high vacuum multifunctional magnetron sputtering equipment, the distance between the target and the substrate is 4cm, and the background pressure is 1.0 ×10 -5 Pa, sputtering by radio frequency magnetron sputtering, the power of radio frequency magnetron sputtering is 100W, the working pressure is 1.0Pa, the sputtering time is 5min, and the lit...

Embodiment 2

[0050] (1) Preparation of lithium phosphate target

[0051] Mix lithium phosphate powder with absolute ethanol, mill it in a ball mill at a speed of 400rpm for 5 hours, ball mill it into a slurry, place the slurry at 70°C for 48 hours in vacuum to obtain a powder, and make the powder into a 60mm-diameter ball by cold pressing The lithium phosphate target precursor was finally calcined in air at 600°C for 4h.

[0052] (2) Preparation of lithium iron phosphate electrode coated with lithium phosphate

[0053] Place the lithium iron phosphate electrode and lithium phosphate target as the substrate in the sputtering chamber of JGP450 ultra-high vacuum multifunctional magnetron sputtering equipment, the distance between the target and the substrate is 4cm, and the background pressure is 1.0 ×10 -5 Pa, sputtering by radio frequency magnetron sputtering, the power of radio frequency magnetron sputtering is 100W, the working pressure is 1.0Pa, the sputtering time is 20min, and the li...

Embodiment 3

[0059] (1) Preparation of lithium phosphate target

[0060] Mix lithium phosphate powder with absolute ethanol, mill it in a ball mill at a speed of 400rpm for 5 hours, ball mill it into a slurry, place the slurry at 70°C for 48 hours in vacuum to obtain a powder, and make the powder into a 60mm-diameter ball by cold pressing The lithium phosphate target precursor was finally calcined in air at 600°C for 4h.

[0061] (2) Preparation of lithium iron phosphate electrode coated with lithium phosphate

[0062] Place the lithium iron phosphate electrode and lithium phosphate target as the substrate in the sputtering chamber of JGP450 ultra-high vacuum multifunctional magnetron sputtering equipment, the distance between the target and the substrate is 4cm, and the background pressure is maintained at 1.0×10 -5 Pa, sputtering by radio frequency magnetron sputtering, the power of radio frequency magnetron sputtering is 100W, the working pressure is 1.0Pa, and the sputtering time is ...

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Abstract

The invention relates to a lithium phosphate coated lithium iron phosphate electrode and a preparation method thereof, belonging to the technical field of electrode materials for lithium secondary batteries. The surface of the lithium iron phosphate electrode is coated with nanoscale glassy state lithium phosphate. The electrode preparation method comprises the following steps of: mixing lithium phosphate powder and an organic solvent, carrying out ball-milling on the mixture to form pulp, drying the pulp to obtain powder, compacting the powder into a lithium phosphate target precursor, and then calcining to obtain a lithium phosphate target; carrying out magnetron sputtering on lithium iron phosphate electrode (serving as substrate) and the lithium phosphate target to obtain the lithium phosphate coated lithium iron phosphate electrode, wherein the distance between the target and the substrate is 4-8cm, and the background intensity of pressure is less than or equal to 10*10<-5>Pa. The electrode has high lithium-ion conductivity, and also the capacity of the electrode is improved; the coated lithium phosphate has good chemistry and electrochemical stability and can be used for protecting the stability of the electrode structure; the preparation method is simple and low in cost; and the large-scale production is easy to realize.

Description

technical field [0001] The invention relates to a coated lithium phosphate (Li 3 PO 4 ) lithium iron phosphate (LiFePO 4 ) electrode and a preparation method thereof, belonging to the technical field of lithium secondary battery electrode materials. Background technique [0002] With the progress and development of society, the problems of energy and environment have become increasingly prominent, and the use of clean energy has attracted extensive attention. In 1990, Sony successfully developed a lithium secondary battery and put it on the market. The reusable, green and environmentally friendly lithium secondary battery gradually entered people's field of vision and became the focus of people's attention. Nowadays, lithium secondary batteries have been widely used in portable electronic energy storage devices, such as digital cameras and notebook computers. At the same time, lithium secondary batteries are also used in driving hybrid electric vehicles and pure electric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 吴锋谭国强陈人杰陈楠李丽陈实
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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