Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Tungsten trioxide/tungsten dioxide composite material capable of being used as negative electrode of lithium ion battery and preparation method of tungsten trioxide/tungsten dioxide composite material

A lithium-ion battery and tungsten trioxide technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problem of losing electronic contact between active materials and current collectors, destroying the stability of electrode materials, and reducing electrode cycle performance and other issues, to achieve the effect of reducing volume change, reducing charge transfer resistance, and improving discharge specific capacity

Inactive Publication Date: 2017-09-19
SHAANXI UNIV OF SCI & TECH
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, WO 3 When used as a negative electrode material, its structure and volume will change greatly during the charging / discharging process, which will destroy the stability of the electrode material, lead to mechanical crushing and the loss of the electronic connection between the active material and the current collector, and finally make the cycle of the electrode Performance decline [Jiaqin Yang, Lifang Jiao, Qianqian Zhao, et al. Facile preparation and electrochemical properties of hierarchical chrysanthemum-like WO 3 0.33H 2 O[J].Journal of Materials Chemistry,2012,22:3699-3701.]
Moreover, due to various factors, the actual capacity is often lower than the theoretical capacity

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Tungsten trioxide/tungsten dioxide composite material capable of being used as negative electrode of lithium ion battery and preparation method of tungsten trioxide/tungsten dioxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Prepare 0.5M C 6 h 8 o 7 ·H 2 O in distilled water, 0.5 M Na 2 WO 4 2H 2 O distilled water.

[0031] 2) Dilute the above solution by volume ratio C 6 h 8 o 7 ·H 2 O:Na 2 WO 4 2H 2 Mix at a ratio of O=2:1, and stir at 25°C for 15 minutes.

[0032] 3) Adjust the pH of the above mixed solution to 1 with a 2M HCl solution.

[0033] 4) Pour the homogeneously mixed solution into a polytetrafluoroethylene-lined high-pressure hydrothermal reactor, keeping the volume filling ratio at 40%.

[0034] 5) Put the sealed reaction kettle into the homogeneous hydrothermal reactor, set the temperature parameter to 160° C., and the reaction time to 28 hours.

[0035] 6) Cool to room temperature after the reaction, centrifuge the final reactant, and wash with deionized water and absolute ethanol three times respectively. Put the centrifuged and washed powder in a vacuum oven at 60°C for 10 hours to obtain the final product.

[0036] The Coulombic efficiency can reach 95...

Embodiment 2

[0039] 1) Prepare 1M of C 6 h 8 o 7 ·H 2 O in distilled water, 1M Na 2 WO 4 2H2 O distilled water.

[0040] 2) Dilute the above solution by volume ratio C 6 h 8 o 7 ·H 2 O:Na 2 WO 4 2H 2 O=1:1 ratio mixed, stirred at 35°C for 35min.

[0041] 3) Adjust the pH of the above mixed solution to 3 with a 3M HCl solution.

[0042] 4) Pour the homogeneously mixed solution into a polytetrafluoroethylene-lined high-pressure hydrothermal reactor, keeping the volume filling ratio at 60%.

[0043] 5) Put the sealed reactor into the homogeneous hydrothermal reactor, set the temperature parameter to 200° C., and the reaction time to 20 h.

[0044] 6) Cool to room temperature after the reaction, centrifuge the final reactant, and wash with deionized water and absolute ethanol three times respectively. Put the centrifuged and washed powder into a vacuum oven at 80°C for 5 hours to dry to obtain the final product.

[0045] The Coulombic efficiency can reach 92% after 500 cycles a...

Embodiment 3

[0047] 1) Prepare 0.8M C 6 h 8 o 7 ·H 2 O in distilled water, 0.8 M Na 2 WO 4 2H 2 O distilled water.

[0048] 2) Dilute the above solution by volume ratio C 6 h 8 o 7 ·H 2 O:Na 2 WO 4 2H 2 Mix at a ratio of O=3:1, and stir at 30°C for 25 minutes.

[0049] 3) Adjust the pH of the above mixed solution to 2 with a 2M HCl solution.

[0050] 4) Pour the homogeneously mixed solution into a polytetrafluoroethylene-lined high-pressure hydrothermal reactor, keeping the volume filling ratio at 50%.

[0051] 5) Put the sealed reactor into a homogeneous hydrothermal reactor, set the temperature parameter to 180° C., and the reaction time to 24 hours.

[0052] 6) Cool to room temperature after the reaction, centrifuge the final reactant, and wash with deionized water and absolute ethanol three times respectively. The final product is obtained by putting the centrifuged and washed powder into a vacuum oven or a freeze drying oven at 70° C. for 8 hours to dry.

[0053] The ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a tungsten trioxide / tungsten dioxide composite material capable of being used as a negative electrode of a lithium ion battery and a preparation method of the tungsten trioxide / tungsten dioxide composite material. The preparation method comprises the following steps: uniformly mixing a citric acid solution and a tungsten source solution to obtain a mixed solution A, wherein the mole ratio of citric acid to a tungsten source in the mixed solution A is (1 to 4) to 1; adjusting the pH (Potential of Hydrogen) value of the mixed solution A to be 1 to 3 and carrying out homogeneous hydrothermal reaction at 160 DEG C to 200 DEG C; after finishing the homogeneous hydrothermal reaction, cooling to room temperature; separating out a product and washing and drying to obtain the tungsten trioxide / tungsten dioxide composite material capable of being used as the negative electrode of the lithium ion battery. According to the tungsten trioxide / tungsten dioxide composite material, tungsten trioxide with a relatively high theoretical capacity and poor cyclic performance is compounded with tungsten dioxide with a relatively low theoretical capacity; the problem that the tungsten trioxide has relatively great volume change in a circulating process is solved by utilizing the metal conductivity of the tungsten dioxide; the specific capacity is improved, the volume change in the circulating process is reduced, the discharge specific capacity of WO3 is improved and the charge transfer resistance of the WO3 is reduced.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a tungsten trioxide / tungsten dioxide composite material which can be used as a negative electrode of a lithium ion battery and a preparation method thereof. Background technique [0002] As an important n-type semiconductor oxide, tungsten trioxide (WO 3 ) are widely used in chemical sensors, photocatalysis, energy conversion systems and other fields [Jinzhan Su, Liejin Guo, Ningzhong Bao, et al. Nanostructured WO 3 / BiVO 4 heterojunction films for efficient photoelectrochemical water splitting [J]. Nano Letters, 2011, 11:1928-1933.]. Due to its large theoretical capacity (693mAh / g), low cost, and high safety (high melting temperature and mechanical stability), it can be used as an anode material for lithium-ion batteries [Songhun Yoon, Changshin Jo, Soon Young Noh, et al. Development of a high-performance anode for lithium ion batteries usi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/62H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 曹丽云李妍黄剑锋冯亮亮李嘉胤吴建鹏赵肖肖
Owner SHAANXI UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com