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Method for preparing high-purity and monoclinic-phase ZnWo4 nano particle and application thereof

A nanoparticle, monoclinic phase technology, applied in the field of battery material science, to achieve the effect of simple operation, good cycle performance and high purity

Inactive Publication Date: 2012-02-01
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]There is no relevant report about the application of nano-ZnWO4 in lithium batteries

Method used

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  • Method for preparing high-purity and monoclinic-phase ZnWo4 nano particle and application thereof
  • Method for preparing high-purity and monoclinic-phase ZnWo4 nano particle and application thereof
  • Method for preparing high-purity and monoclinic-phase ZnWo4 nano particle and application thereof

Examples

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Embodiment 1

[0019] A high-purity monoclinic ZnWO 4 The preparation steps of nanoparticles include: 1mmol Zn (NO 3 ) · 6H 2 O, 1 mmol Na 2 WO 4 Dissolve 0.5mmol citric acid in 30mL distilled water and stir for 30 minutes, then transfer the solution to a 50mL reactor, react at 160°C for 12h, cool naturally after the reaction, wash the product several times with distilled water and absolute ethanol, and dry Obtain the high-purity (more than 85%) monoclinic ZnWO 4 Nanoparticles, the size of which is 20-30nm. It exactly matches the peak position of JCPDS 01-089-7624 in the standard spectrum library.

[0020] High-purity monoclinic ZnWO 4 The application of nanoparticles is to combine high-purity monoclinic ZnWO 4 Nanoparticles are used in lithium batteries. According to mass ratio ZnWO 4 : Polyvinylidene fluoride: Acetylene black = 60: 10: 30 Mix and grind and apply evenly on about 0.25 cm 2 The copper sheet is used as the positive electrode, the negative electrode is lithium metal, ...

Embodiment 2

[0022] A high-purity monoclinic ZnWO 4 The preparation steps of nanoparticles include: 1mmol Zn (NO 3 ) · 6H 2 O, 1 mmol Na 2 WO 4 Dissolve 0.5mmol citric acid in 30mL distilled water and stir for 30 minutes, then transfer the solution to a 50mL reactor, react at 200°C for 24h, cool naturally after the reaction, wash the product several times with distilled water and absolute ethanol, and dry Obtain described high-purity monoclinic phase ZnWO 4 Nanoparticles, the size of which is about 20-30nm. It exactly matches the peak position of JCPDS 01-089-7624 in the standard spectral library.

[0023] High-purity monoclinic ZnWO 4 The application of nanoparticles is to combine high-purity monoclinic ZnWO 4 Nanoparticles are used in lithium batteries. According to mass ratio ZnWO 4 : Polyvinylidene fluoride: Acetylene black = 60: 10: 30 Mix and grind and apply evenly on about 0.25 cm 2 The copper sheet is used as the positive electrode, the negative electrode is lithium metal...

Embodiment 3

[0025] A high-purity monoclinic ZnWO 4 The preparation steps of nanoparticles include: 1mmol Zn (NO 3 ) · 6H 2 O, 1 mmol Na 2 WO 4 Dissolve 0.5mmol citric acid in 30mL distilled water and stir for 30 minutes, then transfer the solution to a 50mL reactor, react at 180°C for 18h, cool naturally after the reaction, wash the product several times with distilled water and absolute ethanol, and dry Obtain the high-purity (more than 85%) monoclinic ZnWO 4 Nanoparticles, the size of which is about 20-30nm. It exactly matches the peak position of JCPDS01-089-7624 in the standard spectrum library.

[0026] High-purity monoclinic ZnWO 4 The application of nanoparticles is to combine high-purity monoclinic ZnWO 4 Nanoparticles are used in lithium batteries. According to mass ratio ZnWO 4 : Polyvinylidene fluoride: Acetylene black = 60: 10: 30 Mix and grind and apply evenly on about 0.25 cm 2 The copper sheet is used as the positive electrode, the negative electrode is lithium me...

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Abstract

The invention relates to a method for preparing a high-purity and monoclinic-phase ZnWo4 nano particle and an application thereof. The high-purity and monoclinic-phase ZnWo4 nano particle is synthesized by a simple hydrothermal process. The synthesis method has the advantages of simpleness for operation, low cost, high purity and capability of massively synthesizing. In the invention, the ZnWo4 nano particle is first used in a lithium ion battery as a lithium ion negative pole material and presents excellent cycling property and high specific capacity. The specific capacity can still reach about 250mAhg-1 after the ZnWo4 nano particle is cycled at the current density of 0.5Ag-1 for 30 times. The specific capacity can still reach about 220mAhg-1 after the ZnWo4 nano particle is cycled at the current density of 2 Ag-1 for 30 times.

Description

technical field [0001] The invention belongs to the field of battery materials, and more specifically relates to a high-purity monoclinic ZnWO 4 Preparation methods of nanoparticles and their applications. [0002] Background technique [0003] The core of lithium-ion batteries is lithium storage materials. Graphite is currently the anode material widely used in commercial Li-ion batteries. However, the lithium intercalation potential of graphite is low, and lithium metal deposition may be caused on the surface of graphite during charging and discharging, which poses certain safety hazards. my country is rich in tungsten resources. Recently, monoclinic FeWO 4 , CuWO 4 , CaWO 4 Isotungstate and its related tungsten oxygen compounds have become more promising battery materials due to their good cycle performance, non-toxicity, and safety. [0004] No nano ZnWO 4 Related reports on applications in lithium batteries. [0005] Contents of the invention [0006] In or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00B82Y40/00H01M4/48
CPCY02E60/12Y02E60/10
Inventor 魏明灯王昌菊
Owner FUZHOU UNIV