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Preparation method of vanadium dioxide nano material and application in rechargeable magnesium battery

A vanadium dioxide and nanomaterial technology, applied in the field of electrochemistry, can solve the problems of large discharge specific capacity decay and short cycle life, and achieve the effects of good magnesium storage electrochemical performance, excellent rate performance, and good electrochemical performance.

Active Publication Date: 2017-06-30
上海鑫忆丹新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] VO of various shapes mentioned above 2 (B) When the material is applied to a lithium-ion battery at a high current density, the cycle life is short, and the discharge specific capacity decays greatly, which is only suitable for discharge at a low current density.

Method used

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  • Preparation method of vanadium dioxide nano material and application in rechargeable magnesium battery
  • Preparation method of vanadium dioxide nano material and application in rechargeable magnesium battery
  • Preparation method of vanadium dioxide nano material and application in rechargeable magnesium battery

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Experimental program
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Effect test

Embodiment 1

[0033] Accurately weigh and weigh 0.364g V 2 o 5 and 0.630g of citric acid were dissolved in 66mL of distilled water, stirred at 40°C for 22h to obtain a grass green suspension, which was transferred to a 100mL high-pressure hydrothermal reactor lined with polytetrafluoroethylene, and heated at 180°C Keep it warm for a period of time (from room temperature to 180 ° C, heating rate 5 ° C / min), then naturally cool to room temperature, collect the solid by suction filtration, and wash with absolute ethanol and distilled water several times in sequence to obtain a blue-black solid, and finally in Dry at 100°C for 12 hours under vacuum to obtain blue-black vanadium dioxide powder. The prepared vanadium dioxide is phase B, with high purity and good crystallinity; its microscopic appearance is nanosheets with a length of 30-300nm and a width of 30-200nm, see figure 1 The SEM.

[0034] The vanadium dioxide powder material is made into magnesium rechargeable battery positive pole ...

Embodiment 2

[0037] Accurately weigh and weigh 0.364g V 2 o 5 , 0.630g of citric acid and 0.058g of sodium lauryl sulfate were dissolved in 66mL of distilled water, and stirred at a constant temperature at 40°C for 22h to obtain a grass-green suspension liquid, which was transferred to 100mL of high-pressure water lined with polytetrafluoroethylene In a thermal reaction kettle, keep warm at 180°C for a period of time (from room temperature to 180°C, heating rate 5°C / min), then naturally cool to room temperature, collect the solid by suction filtration, and wash with absolute ethanol and distilled water several times, A blue-black solid was obtained, and finally dried under vacuum at 100° C. for 12 hours to obtain a blue-black vanadium dioxide powder. The obtained vanadium dioxide is phase B, with high purity and good crystallinity, see Figure 4 XRD; its microscopic appearance is a nanorod with a length of 600-800nm ​​and a width of 50-100nm, see image 3 The SEM.

[0038] Vanadium dio...

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Abstract

The invention relates to a preparation method of a vanadium dioxide nano material and application in a rechargeable magnesium battery. The vanadium dioxide nano material, of which the crystal structure is a phase B, is prepared by taking vanadium pentoxide, citric acid and a surfactant which are low in cost as raw materials and adopting a one-pot hydrothermal method; the vanadium dioxide nano material is high in purity and good in crystallization performance, and the preparation method is easy to control. When the phase-B vanadium dioxide nano material is used as a cathode material of the rechargeable magnesium battery, at the current density of 50 mA / g, the first specific discharge capacity can be up to 394.2 mAh / g; after the battery is cycled for 60 circles, the specific discharge capacity still can be kept at 205.9 mAh / g, and a discharge voltage platform reaches 2.1 V (vs.Mg<2+> / Mg), so that relatively high electrochemical magnesium removal and embedding performance is achieved.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a preparation method of a vanadium dioxide nanometer material and its application in a magnesium rechargeable battery. Background technique [0002] The problems of environmental pollution and energy crisis force people to develop clean, high-energy new multivalent transfer energy storage systems. Compared with lithium batteries, magnesium rechargeable batteries have a higher volume specific capacity (3832mAh / cm 3 ), low cost, safety and environmental protection. Magnesium rechargeable batteries are an important research direction for high specific energy secondary batteries in the future, and are expected to become a new generation of "green batteries". [0003] Compared with lithium-ion batteries, the development of magnesium rechargeable batteries is slow, mainly due to two reasons: first, magnesium will form a surface passivation film in most solutions, and it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02B82Y30/00H01M4/1391H01M4/48H01M10/054
CPCB82Y30/00C01G31/02C01P2002/72C01P2004/03C01P2004/16C01P2004/34C01P2004/62C01P2004/64H01M4/1391H01M4/483H01M10/054Y02E60/10
Inventor 刘渝萍罗婷陈昌国苏红方何春燕李钰莹黄丽婷肖仁超
Owner 上海鑫忆丹新材料有限公司
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