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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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...

Method used

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  • 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 ...

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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

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Application Information

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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
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