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Lamellar manganese lithium phosphate (LiMnPO4) nano-crystal with high-proportion 020 crystal face and method for preparing lamellar LiMnPO4 nano-crystal

A nanocrystalline, high-proportion technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as difficult to control crystal plane orientation growth, poor electrochemical performance of products, and large particle size of products, so that the preparation parameters are easy to control , Improve the transmission speed, the effect of narrow particle size distribution

Active Publication Date: 2012-07-04
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current synthesis methods are high-temperature solid-phase methods, which use lithium salts, manganese salts, phosphates, and carbon materials as raw materials. After calcination in a reducing atmosphere, the particle size of the product is large, and it is difficult to control the growth of crystal plane orientation, resulting in Poor electrochemical performance; and there are also problems of cumbersome operation, low product purity and high production cost

Method used

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  • Lamellar manganese lithium phosphate (LiMnPO4) nano-crystal with high-proportion 020 crystal face and method for preparing lamellar LiMnPO4 nano-crystal
  • Lamellar manganese lithium phosphate (LiMnPO4) nano-crystal with high-proportion 020 crystal face and method for preparing lamellar LiMnPO4 nano-crystal
  • Lamellar manganese lithium phosphate (LiMnPO4) nano-crystal with high-proportion 020 crystal face and method for preparing lamellar LiMnPO4 nano-crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve manganese acetate in 30ml of diethylene glycol, and prepare a solution with a manganese ion concentration of 0.02M. Take the weighed manganese salt as a reference, and weigh lithium acetate according to the molar ratio of Li:Mn:P=1:1:1 and lithium dihydrogen phosphate, and then it was dissolved in 30ml of diethylene glycol to prepare a solution with a phosphate concentration of 0.02M, which was then slowly added dropwise to the prepared diethylene glycol solution of manganese acetate and stirred for 3 hours. Obtain pink suspension; Slowly add dropwise the sodium lauryl sulfate of 1ml in the suspension obtained, then add Lithium Hydroxide and adjust suspension pH to 8, the suspension obtained is packed in 100 ml hydrothermal kettle, Heat treatment at 180°C for 10 hours to obtain a pink precipitate; wash the precipitate with acetone and absolute ethanol, and then dry at 60°C for 24 hours to obtain a final tap density of 1.2 g / cm 3 Flaky LiMnPO with a high proport...

Embodiment 2

[0032] Dissolve manganese chloride in 30ml of isopropanol to prepare a solution with a manganese ion concentration of 0.01M. Taking the weighed manganese salt as a reference, weigh the chlorine according to the molar ratio of Li:Mn:P=1:1:1 Lithium chloride and ammonium dihydrogen phosphate, then lithium chloride and ammonium dihydrogen phosphate were dissolved in 30ml of isopropanol to prepare a solution with a phosphate concentration of 0.01M, and then slowly added dropwise to the prepared manganese chloride In the isopropanol solution, stir for 12 hours to obtain a pink suspension; slowly add 10 ml of sodium lauryl sulfate dropwise to the obtained suspension, then add sodium hydroxide to adjust the pH of the suspension to 6, and the obtained suspension The solution was put into a 100 ml hydrothermal kettle, and heat-treated at 250°C for 6 hours to obtain a pink precipitate; the precipitate was washed with acetone and absolute ethanol respectively, and then dried at 60°C for 2...

Embodiment 3

[0037] Dissolve manganese sulfate in 30ml of polyethylene glycol 600, and prepare a solution with a manganese ion concentration of 0.05M. Taking the manganese salt as a reference, weigh it according to the molar ratio of Li:Mn:P=1:1:1 Lithium sulfate and sodium dihydrogen phosphate are then dissolved in 30ml polyethylene glycol 600 to prepare a solution with a phosphate concentration of 0.05M, and then slowly added dropwise to the polyethylene glycol 600 solution prepared with manganese sulfate , stirred for 10 hours to obtain a pink suspension; slowly dropwise added 6ml of cetyltrimethylammonium bromide to the obtained suspension, then added ammonia water to adjust the pH of the suspension to 2, and filled the obtained suspension into Heat treatment in a 100 ml hydrothermal kettle at 120°C for 24 hours to obtain a pink precipitate; wash the precipitate with acetone and absolute ethanol respectively, and then dry at 60°C for 24 hours to obtain the final tap density 1.3 g / cm 3...

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Abstract

The invention discloses a lamellar manganese lithium phosphate (LiMnPO4) nano-crystal with a high-proportion 020 crystal face and a method for preparing the lamellar LiMnPO4 nano-crystal. The LiMnPO4 nano-crystal has a lamellar shape, 80 to 95 percent of 020 crystal face of the LiMnPO4 nano-crystal is exposed, a lamella along the [020] direction has a thickness of 10 to 30 nm and a size of 100 to 300 nm, and the tap density of powder is 1.2 to 1.6 g / cm<3>. Lamellar LiMnPO4 nano-crystal powder can serve as a cathode material of a lithium ion battery.

Description

[0001] technical field [0002] The invention relates to a flaky LiMnPO with a high proportion of 020 crystal planes in the field of lithium ion batteries 4 Nanocrystals and methods for their preparation. Background technique [0003] The increasingly serious energy crisis and global environmental problems have accelerated the pace of human society to develop new clean energy storage devices. Among them, lithium-ion batteries have the advantages of high voltage, high capacity, long cycle life, and good safety performance. They have broad application prospects in portable electronic equipment, electric vehicles, space technology and other fields. They are currently energy storage devices that various countries are committed to developing. Olivine-type lithium-containing transition metal phosphate LiMPO 4 (M=Mn, Fe, Co, Ni) has the advantages of stable structure, good thermal stability, high safety, etc., and the theoretical capacity is as high as 170mAh g -1 , is currently...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 关翔锋李广社李莉萍
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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