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High electrochemical performance tungsten dioxide/molybdenum trioxide lithium ion battery negative electrode material and preparing method thereof

A lithium-ion battery, tungsten dioxide technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of poor electronic conductivity, limited electrochemical performance, shortened cycle life, etc., and achieve long service life. , good cycle stability, good electrochemical performance

Inactive Publication Date: 2017-07-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But since MoO 3 When used as the negative electrode material of lithium ion battery, the ionic and electronic conductivity is poor, which limits its electrochemical performance under high current.
In addition, there is a volume expansion effect during charging and discharging, which greatly shortens the cycle life

Method used

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  • High electrochemical performance tungsten dioxide/molybdenum trioxide lithium ion battery negative electrode material and preparing method thereof
  • High electrochemical performance tungsten dioxide/molybdenum trioxide lithium ion battery negative electrode material and preparing method thereof
  • High electrochemical performance tungsten dioxide/molybdenum trioxide lithium ion battery negative electrode material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Prepare 2M of C 6 h 12 o 6 ·H 2 O in distilled water, 1M Na 2 WO 4 2H 2 O in distilled water, 1M Na 2 MoO 4 2H 2 O in distilled water and 0.01M dodecyldimethylhydroxypropyl sulfobetaine in distilled water.

[0036] 2) Dilute the above solution by volume ratio C 6 h 12 o 6 ·H 2 O:Na 2 WO 4 2H 2 O:Na 2 MoO 4 2H 2 O=2:1:1 ratio mixed, stirred at 20°C for 45min. Then, 2% dodecyl dimethyl hydroxypropyl sulfobetaine distilled aqueous solution was added to the obtained solution, and stirred at 20° C. for 45 min.

[0037] 3) Adjust the pH of the above mixed solution to 0.5 with a 2M HCl solution.

[0038] 4) Pour the homogeneously mixed solution into a polytetrafluoroethylene-lined high-pressure hydrothermal reactor, keeping the volume filling ratio at 40%.

[0039] 5) Put the sealed reaction kettle into the homogeneous hydrothermal reaction apparatus, set the temperature parameter to 170° C., and the reaction time to 24 hours.

[0040] 6) Cool to room ...

Embodiment 2

[0043] 1) Prepare 1.5M of C 6 h 12 o 6 ·H 2 O in distilled water, 0.5 M Na 2 WO 4 2H 2 O in distilled water, 0.5 M Na 2 MoO 4 2H 2 O in distilled water and 0.03M dodecyldimethylhydroxypropyl sulfobetaine in distilled water.

[0044] 2) Dilute the above solution by volume ratio C 6 h 12 o 6 ·H 2 O:Na 2 WO 4 2H 2 O:Na 2 MoO 4 2H 2 O=3:1:1 ratio mixed, stirred at 25°C for 15min. Then, 1.5% dodecyl dimethyl hydroxypropyl sulfobetaine distilled aqueous solution was added to the obtained solution, and stirred at 25° C. for 15 min.

[0045] 3) Adjust the pH of the above mixed solution to 1.5 with a 3M HCl solution.

[0046] 4) Pour the homogeneously mixed solution into a polytetrafluoroethylene-lined high-pressure hydrothermal reactor, keeping the volume filling ratio at 60%.

[0047] 5) Put the sealed reactor into the homogeneous hydrothermal reactor, set the temperature parameter to 200° C., and the reaction time to 20 h.

[0048] 6) Cool to room temperature a...

Embodiment 3

[0054] 1) Prepare 2M of C 6 h 12 o 6 ·H 2 O in distilled water, 0.5 M Na 2 WO 4 2H 2 O in distilled water, 0.5 M Na 2 MoO 4 2H 2 O in distilled water and 0.05M dodecyldimethylhydroxypropyl sulfobetaine in distilled water.

[0055] 2) Dilute the above solution by volume ratio C 6 h 12 o 6 ·H 2 O:Na 2 WO 4 2H 2 O:Na 2 MoO 4 2H 2 O=4:1:1 ratio mixed, stirred at 23°C for 30min. Then, 1% dodecyl dimethyl hydroxypropyl sulfobetaine distilled aqueous solution was added to the obtained solution by volume, and stirred at 23° C. for 30 min.

[0056] 3) Adjust the pH of the above mixed solution to 1 with a 2M HCl solution.

[0057] 4) Pour the homogeneously mixed solution into a polytetrafluoroethylene-lined high-pressure hydrothermal reactor, keeping the volume filling ratio at 50%.

[0058] 5) Put the sealed reactor into a homogeneous hydrothermal reactor, set the temperature parameter to 180° C., and the reaction time to 22 hours.

[0059] 6) Cool to room tempera...

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Abstract

The invention relates to a high electrochemical performance tungsten dioxide / molybdenum trioxide lithium ion battery negative electrode material and a preparing method thereof. The method comprises the steps of mixing a monosaccharide solution, a tungsten source solution and a molybdenum source solution evenly to obtain a mixed solution A, adding a surface active agent solution to the mixed solution A, performing even mixing to obtain a mixed solution B, wherein the mole ratio of monosaccharide to tungsten source to molybdenum source is (1-4):1:1, and the volume of the surface active agent solution accounts for 1%-2% of the volume of the mixed solution A; adjusting the pH of the mixed solution B to be 0.5-1.5, conducting a homogeneous phase hydrothermal reaction, wherein the reaction temperature is 170-200 DEG C, and the reaction time is 20-24 h; conducting cooling to the room temperature after the homogeneous phase hydrothermal reaction, separating product out, and performing washing and drying to obtain the high electrochemical performance tungsten dioxide / molybdenum trioxide lithium ion battery negative electrode material. The high electrochemical performance tungsten dioxide / molybdenum trioxide lithium ion battery negative electrode material has good cycling stability and is long in service life.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a high electrochemical performance tungsten dioxide / molybdenum trioxide lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] In today's society, lithium-ion batteries are widely used in portable electronic devices, electric vehicles and other fields due to their high energy density, small memory effect, long cycle life, and environmental friendliness. However, with the development of society, the energy density of lithium-ion batteries can no longer meet people's needs. Therefore, it is imminent to explore a new high-capacity lithium-ion battery material. [0003] Molybdenum trioxide (MoO 3 ) as a lithium-ion battery negative electrode material has a theoretical capacity of up to 1117mAh / g. In addition, it also has the advantages of less pollution and low cost. It is an ideal lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M10/0525
CPCH01M4/364H01M4/483H01M10/0525Y02E60/10
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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