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Monoclinic structure Fe2(MoO4)3 nanowire as well as preparation method and application thereof

A nanowire and Å technology, applied in the field of nanomaterials and electrochemistry, can solve problems such as electrolyte consumption, tap density reduction, and material structure degradation

Active Publication Date: 2021-05-28
WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies on the long cycle life of iron molybdate electrode materials at high current densities have not been reported, which may be due to the fact that the nanostructure with high specific surface area will lead to serious interfacial reactions between electrode materials and electrolytes leading to electrolysis. Liquid consumption, resulting in increased internal resistance of the battery and deterioration of the material structure, while nanomaterials will reduce the tap density, which will eventually lead to a decrease in the area / volume energy density of the battery and a decrease in cycle life

Method used

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  • Monoclinic structure Fe2(MoO4)3 nanowire as well as preparation method and application thereof
  • Monoclinic structure Fe2(MoO4)3 nanowire as well as preparation method and application thereof
  • Monoclinic structure Fe2(MoO4)3 nanowire as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0029] A monoclinic structure Fe disclosed in this embodiment 2 (MoO 4 ) 3 The preparation method of the nanowire includes the following steps.

[0030] 1), 0.5387 g ferric nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) with 2 mL nitric acid (HNO 3) was dissolved in 20 mL of ultrapure water, mixed and stirred to obtain a clear and transparent solution.

[0031] 2), weigh 0.3530 g ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 o 24 4H 2 O, n Fe :n Mo =2:3) were dissolved in 20 mL of ultrapure water and stirred evenly to obtain a clear, colorless solution.

[0032] 3) Add the ferric nitrate nonahydrate solution obtained in step 1) into the ammonium molybdate solution obtained in step 2), and stir for 5 h to obtain a clear brown-yellow solution.

[0033] 4), put the precursor solution obtained in step 3) into a polytetrafluoroethylene reactor, conduct a hydrothermal reaction at 160 °C for 48 h, wash the hydrothermal product, and dry to obtain a yellow-green precursor pow...

Embodiment 2

[0043] A monoclinic structure Fe disclosed in this embodiment 2 (MoO 4 ) 3 The preparation method of the nanowire includes the following steps.

[0044] 1), 0.5387 g ferric nitrate nonahydrate ((Fe(NO 3 ) 3 9H 2 O) with 1 mL nitric acid (HNO 3 ) was dissolved in 20 mL of ultrapure water, mixed and stirred to obtain a clear and transparent solution.

[0045] 2), weigh 0.3530 g ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 o 24 4H 2 O, n Fe :n Mo =2:3) were dissolved in 20 mL of ultrapure water and stirred evenly to obtain a clear, colorless solution.

[0046] 3) Add the ferric nitrate nonahydrate solution obtained in step 1) into the ammonium molybdate solution obtained in step 2), and stir for 5 h to obtain a clear brown-yellow solution.

[0047] 4), put the precursor solution obtained in step 3) into a polytetrafluoroethylene reactor, conduct a hydrothermal reaction at 160 °C for 24 h, wash the hydrothermal product, and dry to obtain a yellow-green precursor p...

Embodiment 3

[0051] A monoclinic structure Fe disclosed in this embodiment 2 (MoO 4 ) 3 The preparation method of the nanowire includes the following steps.

[0052] 1), 0.5387 g ferric nitrate nonahydrate ((Fe(NO 3 ) 3 9H 2 O) with 3 mL nitric acid (HNO 3 ) was dissolved in 20 mL of ultrapure water, mixed and stirred to obtain a clear and transparent solution.

[0053] 2), weigh 0.3530 g ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 o 24 4H 2 O, n Fe :n Mo =2:3) were dissolved in 20 mL of ultrapure water and stirred evenly to obtain a clear, colorless solution.

[0054] 3) Add the ferric nitrate nonahydrate solution obtained in step 1) into the ammonium molybdate solution obtained in step 2), and stir for 9 h to obtain a clear brown-yellow solution.

[0055]4), put the precursor solution obtained in step 3) into a polytetrafluoroethylene reactor, conduct a hydrothermal reaction at 140 °C for 48 h, wash the hydrothermal product, and dry to obtain a yellow-green precursor po...

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Abstract

The invention discloses a monoclinic structure Fe2(MoO4)3 nanowire, which has a sharp XRD peak, no impure phase peak, good crystallinity and uniform nanowire size, the average diameter of a single nanowire is 100 nm, and the length of the single nanowire is 1-2 microns; the preparation method comprises the following steps: dissolving iron nitrate nonahydrate and nitric acid in ultrapure water to obtain an iron nitrate nonahydrate solution, weighing a corresponding amount of ammonium molybdate tetrahydrate, dissolving the weighed ammonium molybdate tetrahydrate in ultrapure water to obtain an ammonium molybdate solution, adding the iron nitrate nonahydrate solution into the ammonium molybdate solution, and stirring to obtain a clear yellow solution; putting the obtained precursor solution into a polytetrafluoroethylene reaction kettle for hydrothermal reaction, washing and drying a hydrothermal product to obtain yellow green precursor powder, and calcining the precursor powder in an air atmosphere to finally obtain the yellow Fe2(MoO4)3 nanowire. The invention also discloses a method for preparing a lithium ion battery negative electrode. The method has the characteristics of simple process, mild reaction conditions and excellent electrochemical performance of the material.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, in particular to a monoclinic structure Fe 2 (MoO 4 ) 3 Nanowire, and its controllable preparation method, and the material is used as negative electrode active material of lithium ion battery. Background technique [0002] With the demand for high energy density, high power density and environmentally friendly batteries for electric vehicles, the current commercial batteries using graphite as anode materials are due to their low theoretical capacity (370 mA h / g) and unsatisfactory rate performance but unable to meet the growing needs of the people. Therefore, more and more people are devoted to developing new anode materials to improve the energy density, power density and cycle stability of Li-ion batteries. [0003] Fe 2 o 3 Due to its high theoretical capacity (1005 mA h / g), environmental friendliness, and low cost, it has become a promising candidate material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00H01M4/48H01M4/52H01M10/0525B82Y30/00B82Y40/00
CPCC01G39/00H01M4/523H01M4/483H01M10/0525B82Y30/00B82Y40/00H01M2004/021H01M2004/027C01P2002/72C01P2002/77C01P2004/64C01P2004/62C01P2004/61C01P2004/16C01P2004/03C01P2004/04C01P2006/40Y02E60/10
Inventor 梁晨楠危伟魏冰歆陶锴王灿
Owner WUHAN MARINE ELECTRIC PROPULSION RES INST CHINA SHIPBUILDING IND CORP NO 712 INST
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