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A nb for lithium-ion batteries 18 w 16 o 93 Negative electrode material and preparation method thereof

A nb18w16o93, lithium-ion battery technology, which is applied in the field of transition metal oxide electrode materials and its preparation, can solve the problems of reduced Coulombic efficiency, achieve the effects of improved electrochemical performance, simple operation, and increased contact area

Active Publication Date: 2020-09-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although carbon materials have a high specific capacity and good cycle stability, there are still problems to be solved in the actual use of lithium-ion batteries, such as the SEI film on the surface of the carbon layer and the low lithium intercalation potential that lead to a decrease in Coulombic efficiency. Dendrite growth, so researchers are trying their best to find new negative electrode materials with thermodynamic stability and excellent cycle performance

Method used

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  • A nb for lithium-ion batteries <sub>18</sub> w <sub>16</sub> o <sub>93</sub> Negative electrode material and preparation method thereof
  • A nb for lithium-ion batteries <sub>18</sub> w <sub>16</sub> o <sub>93</sub> Negative electrode material and preparation method thereof
  • A nb for lithium-ion batteries <sub>18</sub> w <sub>16</sub> o <sub>93</sub> Negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh 0.500mmol of tungsten hexachloride and 0.563mmol of niobium pentachloride and dissolve them in 70mL of absolute ethanol, stir until a transparent homogeneous solution is formed;

[0027] (2) Pour the precursor solution obtained in step 1) into the reaction kettle, place the reaction kettle in an oven, react at 200°C for 24 hours, then cool the reaction kettle to room temperature, collect the white precipitate in the reaction solution, and use Wash with deionized water and ethanol three times each, and place in an oven at 80°C overnight;

[0028] (3) Put the white solid obtained in step 2) into a mortar and grind for 10 minutes;

[0029] (4) Put the solid fine powder obtained in step 3) in a tube furnace, and heat-treat at 800°C for 12h under nitrogen to obtain the desired Nb 18 W 16 o 93 Negative material.

Embodiment 2

[0031] (1) Weigh 0.500mmol of tungsten hexachloride and 0.563mmol of niobium pentachloride and dissolve them in 70mL of absolute ethanol, stir until a transparent homogeneous solution is formed;

[0032] (2) Pour the precursor solution obtained in step 1) into the reaction kettle, place the reaction kettle in an oven, react at 200°C for 24 hours, then cool the reaction kettle to room temperature, collect the white precipitate in the reaction solution, and use Wash with deionized water and ethanol three times each, and place in an oven at 80°C for more than 12 hours;

[0033] (3) Put the white solid obtained in step 2) into a mortar and grind for 10 minutes;

[0034] (4) Put the solid fine powder obtained in step 3) in a tube furnace and heat-treat at 850°C for 12h under nitrogen to obtain the desired Nb 18 W 16 o 93 Negative material.

Embodiment 3

[0036] (1) Weigh 0.500mmol of tungsten hexachloride and 0.563mmol of niobium pentachloride and dissolve them in 70mL of absolute ethanol, stir until a transparent homogeneous solution is formed;

[0037] (2) Pour the precursor solution obtained in step 1) into the reaction kettle, place the reaction kettle in an oven, react at 200°C for 24 hours, then cool the reaction kettle to room temperature, collect the white precipitate in the reaction solution, and use Wash with deionized water and ethanol three times each, and place in an oven at 80°C for more than 12 hours;

[0038] (3) Put the white solid obtained in step 2) into a mortar and grind for 10 minutes;

[0039] (4) Put the solid fine powder obtained in step 3) in a tube furnace, and heat-treat at 900°C for 12h under nitrogen to obtain the desired Nb 18 W 16 o 93 Negative material.

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Abstract

The invention discloses an Nb18W16O93 anode material for lithium ion batteries and a preparation method of the Nb18W16O93 anode material. The preparation method includes dissolving a niobium source and a tungsten source in anhydrous ethanol, performing hydrothermal treatment under certain conditions to obtain a precursor solution, drying precipitates obtained by centrifugation of the precursor solution under vacuum, and performing heat treatment under certain conditions to obtain the Nb18W16O93 anode material. The preparation method is simple to operate, does not require complicated equipmentand has a low cost; obtained Nb18W16O93 comprises irregular nanoparticles, spindle-shaped nanospheres and nanorods, and the spindle-shaped nanospheres comprise primary nanoparticles. The obtained Nb18W16O93 anode material has high specific discharge capacity of 177.1 mAh g<-1> at the magnification of 0.3 C, thereby being an excellent anode material for the lithium ion batteries.

Description

technical field [0001] The invention relates to the field of lithium-ion battery electrode materials, in particular to a transition metal oxide electrode material for lithium-ion batteries and a preparation method thereof. Background technique [0002] In order to follow the concept of sustainable development and renewable energy, it has gradually become the consensus of mankind to develop efficient, green and pollution-free new energy storage equipment. Under this premise, with the rise of various portable electronic devices and electric vehicles, the research on electric energy storage and release has gradually attracted the attention of researchers. There are two main types of common storage devices for electrical energy: traditional capacitors and chemical batteries. A significant advantage of conventional capacitors is their high power density due to their ability to rapidly discharge or store charge. However, the small amount of charge stored in traditional capacitor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M10/0525B82Y30/00C01G41/00
CPCB82Y30/00B82Y40/00C01G41/00C01P2002/72C01P2004/03C01P2004/16C01P2004/62C01P2004/64C01P2006/40H01M4/5825H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 吕建国任磊
Owner ZHEJIANG UNIV