Tungsten oxide nanowire wound composite material, preparation method and application

A technology of tungsten oxide nanowires and winding composite materials, which is applied in the field of composite materials, can solve problems such as low conductivity and poor cycle stability of electrodes, and achieve high yield, obvious electrochemical performance, and excellent charge and discharge performance.

Active Publication Date: 2016-02-24
合肥龙智机电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these high-capacity negative electrode materials have low conductivity, and under the condition of high-level lithium deintercalation, there is a serious volume effect, resulting in poor cycle stability of the electrode.

Method used

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  • Tungsten oxide nanowire wound composite material, preparation method and application
  • Tungsten oxide nanowire wound composite material, preparation method and application
  • Tungsten oxide nanowire wound composite material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Configure deionized water and H according to the volume ratio (3 / 1 / 1) 2 o 2 and concentrated H 2 SO 4 500mL of aqueous solution. Disperse the nano-Si powder in it, disperse evenly by ultrasonic, vacuumize, fill with Ar gas protection, and ultrasonic at 60°C for 60min. Filter with suction, wash with deionized water three times, and dry in vacuum.

[0034] Take 0.1 g of the above-mentioned hydroxylated and modified nano-Si powder and redisperse it in 30 mL of absolute ethanol, disperse it ultrasonically for 1 h to make it uniformly dispersed, and add a certain amount of WCl 6 , ultrasonically dispersed for 1 h, continued to stir for 6 h, and then transferred to a 50 mL hydrothermal reactor, and reacted at 180 ° C for 24 h. After the reaction, centrifuge, wash with ethanol three times, and dry in vacuum to obtain a Si composite material coated with tungsten oxide nanowires, wherein the mass ratio of tungsten oxide nanowires to Si is about 1:1.5.

[0035] The Si compo...

Embodiment 2

[0039] Prepare two 200mL aqueous solutions containing 1wt.%PDDA and 0.2MNaCl, and disperse them uniformly by ultrasonication for 10 minutes; 2 Nanoparticles (50nm) were sequentially modified by PDDA-PSS-PDDA, filtered, vacuum-dried at 70°C for 2 hours, ground after drying, and marked for storage.

[0040] Take the above modified SnO 2 Re-disperse 0.25g of nanoparticles in 30mL of absolute ethanol, ultrasonically disperse for 1h to make them uniformly dispersed, add a certain amount of WCl 6 , ultrasonically dispersed for 1 h, continued to stir for 6 h, transferred to a 50 mL hydrothermal reactor, and reacted at 200 ° C for 10 h. After the reaction, centrifuge, wash with ethanol 3 times, and dry in vacuum, the tungsten oxide nanowires and SnO 2 The mass ratio is about 1:5.

[0041] SnO coated with tungsten oxide nanowires 2 The complex was re-dispersed ultrasonically in 50mL deionized water, and the ultrasonic dispersion was uniform.

[0042] Disperse 0.2 g of chitosan in ...

Embodiment 3

[0046] Take 3 g of polyvinylpyrrolidone (PVP, molecular weight: 25000), disperse it in 100 mL of absolute ethanol, and disperse evenly by ultrasonic (sonication for 10 min). Take 1g of zinc ferrite (about 50nm) and disperse in it, stir ultrasonically for 10min until it is evenly dispersed, and seal the mouth. Continue to sonicate for 1h. Filter and dry in vacuum at 70°C for 2h. Prepare PVP modified zinc ferrite after grinding;

[0047] Take 0.2 g of the above-mentioned modified zinc ferrite nanoparticles and redisperse them in 30 mL of absolute ethanol, ultrasonically disperse for 1 h to make them uniformly dispersed, add a certain amount of WCl 6 , ultrasonically dispersed for 1 hour, continued stirring for 6 hours, transferred to a 50 mL hydrothermal reactor, and reacted at 180 ° C for 48 hours. After the reaction, centrifuge, wash with ethanol 3 times, and dry in vacuum, the tungsten oxide nanowires and SnO 2 The mass ratio is about 1:4.

[0048] The zinc ferrite compo...

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Abstract

The invention discloses a tungsten oxide nanowire wound composite material, a preparation method and application thereof in lithium ion batteries. A tungsten oxide nanowire is wound on the surface of a modified active substance surface to serve as an external expansion inhibition material, and then the outer surface is coated with a carbon layer to serve as a conducting layer to obtain the high performance tungsten oxide nanowire wound composite material. The tungsten oxide nanowire wound composite material prepared by the method provided by the invention can be used as a lithium ion battery cathode material. The process involved in the invention has the advantages of simple step, good repeatability, high yield, low cost, and good large-scale application potential. The composite material active material surface is coated and wound with a tungsten oxide nanowire and the nanowire is coated with a carbon layer, and the structure can effectively restrain the volume effect of nano materials and can significantly improve the electrochemical properties of the active substance. The tungsten oxide nanowire wound composite material can be applied to preparation of lithium ion electrodes, and has good cyclic stability and excellent charge and discharge performance.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a tungsten oxide nanowire winding composite material, a preparation method and an application in lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high open-circuit voltage, high energy density, long service life, no memory effect, less pollution, and low self-discharge rate. Its overall performance is superior to other traditional secondary batteries, and it is unanimously considered as a variety of portable batteries. The most ideal power supply for electronic equipment and electric vehicles. Although graphite, the negative electrode material of traditional lithium-ion batteries, has good cycle stability and high cost performance, due to its low charge-discharge specific capacity and no advantage in volume specific capacity, it is difficult to meet the high requirements of power systems, especially electric vehicles an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/366H01M10/0525Y02E60/10
Inventor 岳鹿张文惠刘成宋佳玲
Owner 合肥龙智机电科技有限公司
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