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Preparation method of bird's nest lithium manganese phosphate

A bird's nest and phosphoric acid solution technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low electronic and ion conductivity, limit the diffusion rate of lithium ions, and low discharge rate capacity, etc., and achieve uniform morphology Effect

Inactive Publication Date: 2016-03-02
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its inherent low electronic and ionic conductivity (especially at low temperature) and low discharge rate capacity limit LiMnPO 4 Application of Cathode Materials
Defect pairs such as Li / M antisite defects, M ions occupying Li positions, and lithium holes limit the diffusion rate of lithium ions in the olivine structure.

Method used

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  • Preparation method of bird's nest lithium manganese phosphate
  • Preparation method of bird's nest lithium manganese phosphate
  • Preparation method of bird's nest lithium manganese phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 1.2379g manganese acetate (Mn(CH 3 COO) 2 4H 2 O), dissolve it in 20mL of ethylene glycol, then add 2g of ascorbic acid, ultrasonicate and stir to dissolve it to form a uniform colorless and transparent solution. Add 340 μL of phosphoric acid solution with a mass percentage concentration of 85 wt% to the colorless and transparent solution to form an off-white viscous suspension; continue stirring for 1 h. An aqueous solution of lithium hydroxide (0.2141g lithium hydroxide (LiOH) dissolved in 5mL of distilled water) was added dropwise to the suspension obtained above at a rate of 0.5mL / min to obtain a gray-green precursor solution; continue stirring for 1h. The precursor solution was placed in a heating mantle and heated to reflux for 8 h, then cooled to room temperature.

[0022] Use a centrifuge to centrifuge at a rotational speed of 5000r / min, remove the upper layer solution, and then wash with absolute ethanol. After repeated centrifugation, washing, and dr...

Embodiment 2

[0024] Weigh 1.2379g manganese acetate (Mn(CH 3 COO) 2 4H 2 O), dissolve it in 20mL of ethylene glycol, then add 1.75g ​​of ascorbic acid, ultrasonicate and stir to make it dissolve to form a uniform colorless and transparent solution. Add 340 μL of phosphoric acid solution with a mass percentage concentration of 85 wt% to the colorless and transparent solution to form an off-white viscous suspension; continue stirring for 0.5 h. An aqueous solution of lithium hydroxide (0.2141g of lithium hydroxide (LiOH) dissolved in 5mL of distilled water) was added dropwise to the suspension obtained above at a rate of 0.5mL / min to obtain a gray-green precursor solution; continue stirring for 3h. The precursor solution was placed in a heating mantle and heated to boiling and refluxed for 2 h, then cooled to room temperature.

[0025] Use a centrifuge to centrifuge at a rotational speed of 5000r / min, remove the upper layer solution, and then wash with water and absolute ethanol. After r...

Embodiment 3

[0027] Weigh 1.2379g manganese acetate (Mn(CH 3 COO) 2 4H 2O), dissolve it in 20mL of ethylene glycol, then add 2.25g of ascorbic acid, ultrasonicate and stir to make it dissolve to form a uniform colorless and transparent solution. Add 340 μL of phosphoric acid solution with a mass percent concentration of 85wt% to the solution to form an off-white viscous suspension; continue stirring for 3 hours. An aqueous solution of lithium hydroxide (0.2141g of lithium hydroxide (LiOH) dissolved in 5mL of distilled water) was added dropwise to the suspension obtained above at a rate of 0.5mL / min to obtain a gray-green precursor solution; continue stirring for 1h. The precursor solution was heated to boiling in a heating mantle and refluxed for 8h, then cooled to room temperature.

[0028] Use a centrifuge to centrifuge at a rotational speed of 5000r / min, remove the upper layer solution, and then wash with water and absolute ethanol. After repeated centrifugation, washing, and drying...

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Abstract

The invention discloses a preparation method of nest-like manganese lithium phosphate, and belongs to the technical field of new energy material preparation. The nest-like LiMnPO4 lithium battery cathode material is prepared by employing a liquid phase method and taking lithium hydroxide, manganese acetate, ascorbic acid and phosphoric acid as raw materials. The specific method comprises: dissolving manganese acetate in glycol, then adding ascorbic acid, ultrasonic processing and stirring for full dissolution and formation of a uniform colorless transparency solution; adding the phosphoric acid solution, and forming a grayish-white thick suspension; dropwise adding the water solution of lithium hydroxide into the suspension to obtain a greyish-green precursor solution; and placing in a heating jacket, heating and refluxing, then centrifuging, washing, and drying to obtain the nest-like LiMnPO4. The special-morphology LiMnPO4 is formed by assembling sheet layers each with the thickness of about 30 nm.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and relates to LiMnPO, a positive electrode material of a bird's nest lithium ion battery 4 method of preparation. Background technique [0002] At present, the energy crisis and environmental pollution have become serious problems faced by the sustainable development of human society. The use of solar, wind and hydroelectric power is difficult to control, resulting in high costs. Energy storage materials have thus become the focus of people's research. As a device that directly converts chemical energy into electrical energy, chemical power sources occupy an important position in the national economy and defense industry. Compared with lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries, lithium-ion batteries have higher energy density. Compared with other batteries, lithium-ion batteries have the advantages of high energy density, hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/10
Inventor 郭林王连建
Owner BEIHANG UNIV