Lithium manganese phosphate composite material as well as preparation method and application thereof

A technology of lithium manganese iron phosphate and composite materials, which is applied in nanotechnology, electrical components, electrochemical generators, etc. for materials and surface science, and can solve the problem that the electrochemical properties of materials cannot be well exerted, and the electronic conductivity Problems such as low diffusion coefficient of lithium ions, achieve high practical use value, improve electrochemical performance, and uniform particles

Inactive Publication Date: 2019-05-10
NANJING GUOXUAN BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiMnPO 4 The electronic conductivity and lithium ion diffusion coefficient are very low, which leads to the poor electrochemical performance of the material and limits its commercial application.

Method used

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  • Lithium manganese phosphate composite material as well as preparation method and application thereof
  • Lithium manganese phosphate composite material as well as preparation method and application thereof
  • Lithium manganese phosphate composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of lithium manganese iron phosphate composite material, comprising the following steps:

[0034]S1, 0.06mol lithium hydroxide is dissolved in 60mL ethylene glycol to obtain lithium hydroxide ethylene glycol solution; 0.02mol phosphoric acid is dissolved in 30mL ethylene glycol to obtain phosphoric acid glycol solution; 0.01mol manganese sulfate monohydrate, Add 0.01mol of ferrous sulfate heptahydrate to 10mL of deionized water, then add 60mL of ethylene glycol and stir evenly to obtain a mixed solution; add the phosphate glycol solution dropwise to the lithium hydroxide ethylene glycol solution at a rate of 1mL / min and stir evenly To obtain a white suspension, add dropwise to the mixed solution at a rate of 2 mL / min and stir evenly, then conduct a hydrothermal reaction for 10 h at a temperature of 180°C, cool, centrifuge, and wash 3 times with deionized water and absolute ethanol , dried for 10h to obtain LiMn 0.5 Fe 0.5 PO 4 Precursor;

[0035]...

Embodiment 2

[0041] A preparation method of lithium manganese iron phosphate composite material, comprising the following steps:

[0042] S1, 0.06mol lithium hydroxide is dissolved in 60mL ethylene glycol to obtain lithium hydroxide ethylene glycol solution; 0.02mol phosphoric acid is dissolved in 30mL ethylene glycol to obtain phosphoric acid glycol solution; 0.01mol manganese sulfate monohydrate, Add 0.01mol of ferrous sulfate heptahydrate to 10mL of deionized water, then add 60mL of ethylene glycol and stir evenly to obtain a mixed solution; add the phosphate glycol solution dropwise to the lithium hydroxide ethylene glycol solution at a rate of 1mL / min and stir evenly To obtain a white suspension, add dropwise to the mixed solution at a rate of 2 mL / min and stir evenly, then conduct a hydrothermal reaction for 10 h at a temperature of 180°C, cool, centrifuge, and wash 3 times with deionized water and absolute ethanol , dried for 10h to obtain LiMn 0.5 Fe 0.5 PO 4 Precursor;

[0043...

Embodiment 3

[0049] A preparation method of lithium manganese iron phosphate composite material, comprising the following steps:

[0050] S1, 0.06mol lithium hydroxide is dissolved in 60mL ethylene glycol to obtain lithium hydroxide ethylene glycol solution; 0.02mol phosphoric acid is dissolved in 30mL ethylene glycol to obtain phosphoric acid glycol solution; 0.01mol manganese sulfate monohydrate, Add 0.01mol of ferrous sulfate heptahydrate to 10mL of deionized water, then add 60mL of ethylene glycol and stir evenly to obtain a mixed solution; add the phosphate glycol solution dropwise to the lithium hydroxide ethylene glycol solution at a rate of 1mL / min and stir evenly To obtain a white suspension, add dropwise to the mixed solution at a rate of 2 mL / min and stir evenly, then conduct a hydrothermal reaction for 10 h at a temperature of 180°C, cool, centrifuge, and wash 3 times with deionized water and absolute ethanol , dried for 10h to obtain LiMn 0.5 Fe 0.5 PO 4 Precursor;

[0051...

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Abstract

The invention discloses a preparation method of a lithium manganese phosphate composite material; the preparation method comprises the following steps of dissolving manganese sulfate monohydrate and ferrous sulfate heptahydrate into deionized water, then adding ethylene glycol to stir to obtain a mixed solution; dropwise adding an ethylene glycol phosphate solution into a lithium hydroxide ethylene glycol solution for stirring, then dropwise adding the mixed solution, stirring, and carrying out hydrothermal reaction, and drying to obtain a LiMn0.5Fe0.5PO4 precursor; sequentially dissolving lithium hydroxide, tetrabutyl titanate and lanthanum nitrate into absolute ethyl alcohol for stirring, then adding deionized water, and then adding the LiMn0.5Fe0.5PO4 precursor for stirring, carrying out hydrothermal reaction and drying to obtain a Li0.3La0.56TiO3-LiMn0.5Fe0.5PO4 precursor; and enabling the Li0.3La0.56TiO3-LiMn0.5Fe0.5PO4 precursor to be mixed with glucose, and performing ball milling, calcining, cooling and sieving to obtain the lithium manganese phosphate composite material. The lithium manganese iron phosphate composite material is relatively small in particle size, uniform in particle size distribution, and high in degree of crystallinity, so that the electrochemical performance of the material is improved while the material preparation cost is lowered.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium manganese iron phosphate composite material and a preparation method and application thereof. Background technique [0002] As the global population continues to grow, the energy consumed by human life continues to increase. It is predicted that by 2100, the global energy consumption will be three times that of the present. Therefore, a large number of fossil fuels such as oil, coal and natural gas are continuously exploited and utilized, which not only leads to the depletion of fossil energy, but also seriously damages the environment and ecology. In order to maintain the sustainable development of human society, it is imminent to develop new clean energy sources. Among them, secondary batteries are highly efficient, clean and pollution-free, and using them as power or auxiliary power sources for internal combustion engine vehicles can effectively reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 房子魁姚汪兵
Owner NANJING GUOXUAN BATTERY CO LTD
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