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A preparation method of titanium-doped nano-tungsten oxide negative electrode material

A technology of nano-tungsten oxide and negative electrode materials, which is applied in the direction of tungsten oxide/tungsten hydroxide, negative electrodes, nanotechnology for materials and surface science, etc. It can solve the problems of poor rate performance and cycle stability, low environmental toxicity, and volume change Large and other problems, to achieve the effect of improving the overall conductivity, short holding time, and simple process

Active Publication Date: 2019-02-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them WO 3 It is the most stable oxide of tungsten at room temperature. It has low environmental toxicity, low price, and high theoretical specific capacity (693mAh∙g-1). It is a negative electrode material for lithium-ion batteries with development potential. However, bulk WO 3 The low conductivity and large volume change during charge and discharge lead to poor rate performance and cycle stability.

Method used

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  • A preparation method of titanium-doped nano-tungsten oxide negative electrode material
  • A preparation method of titanium-doped nano-tungsten oxide negative electrode material
  • A preparation method of titanium-doped nano-tungsten oxide negative electrode material

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Embodiment 1

[0022] A method for synthesizing a titanium-doped nano-tungsten oxide negative electrode material described in this embodiment specifically includes the following steps:

[0023] (1) Add ammonium metatungstate to MIL-125(Ti) at a ratio of 3:1 to 100mL of citric acid solution with a mass fraction of 20%, disperse and dissolve with ultrasonic vibration for 4h, and then place it in vacuum drying After standing still in the box for 24 hours; transfer the solution to a stainless steel reaction kettle with polytetrafluoroethylene liner, put it into a drying box for heating, keep it at 180°C for 20 hours, and then cool it down to room temperature naturally.

[0024] (2) Pour out the turbid liquid in the reaction kettle, filter, wash the precipitate several times with deionized water and alcohol, and dry it in a drying oven at 80°C.

[0025] (3) Place the dried precipitate in step (2) in a microwave oven, rapidly heat it up to 500°C at a rate of 10°C / min in an argon atmosphere, keep i...

Embodiment 2

[0031] The method for synthesizing titanium-doped nano-tungsten oxide negative electrode material described in this embodiment specifically includes the following steps:

[0032] (1) Add ammonium metatungstate to MIL-125(Ti) at a ratio of 4:1 to 100mL of citric acid solution with a mass fraction of 20%, disperse the solution with ultrasonic vibration for 6 hours, and then place it in vacuum drying After standing in the box for 20 hours, the solution was transferred to a stainless steel reaction kettle with polytetrafluoroethylene liner, and heated in a drying box, kept at 170°C for 22 hours, and then naturally cooled to room temperature.

[0033] (2) Pour out the turbid liquid in the reaction kettle, filter, wash the precipitate several times with deionized water and alcohol, and dry it in a drying oven at 80°C.

[0034] (3) Place the dried precipitate in step (2) in a microwave oven, rapidly heat it up to 550°C at a rate of 9°C / min under an argon atmosphere, keep it warm for ...

Embodiment 3

[0038] The method for synthesizing titanium-doped nano-tungsten oxide negative electrode material described in this embodiment specifically includes the following steps:

[0039] (1) Add ammonium metatungstate to MIL-125(Ti) at a mass ratio of 4:1 into 100mL of citric acid solution with a mass fraction of 25%, disperse the solution with ultrasonic vibration for 5h, and then place it in vacuum drying After standing in the oven for 15 hours, the solution was transferred to a stainless steel reaction kettle with polytetrafluoroethylene liner, and heated in a drying oven, kept at 160°C for 24 hours, and then naturally cooled to room temperature.

[0040] (2) Pour out the turbid liquid in the reaction kettle, filter, wash the precipitate several times with deionized water and alcohol, and dry it in a drying oven at 80°C.

[0041] (3) Place the dried precipitate in step (2) in a microwave oven, and rapidly heat it up to 600°C at a rate of 7°C / min under an argon atmosphere. The tita...

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Abstract

The invention discloses a preparation method of a titanium-doped nano tungsten oxide negative electrode material, and belongs to the technical field of a lithium ion battery. The method disclosed by the invention comprises the steps of adding ammonium metatungstate and a porous titanium MOF material to an excessive amount of a citric acid solution, and after vibrating by employing an ultrasonic wave, standing for 12-24h in a vacuum environment to obtain a mixed solution; then, transferring the solution to a reaction kettle, and after a reaction is finished, naturally cooling to a room temperature; filtering, cleaning with deionized water and alcohol for multiple times, and drying; placing dried uniform powder into a microwave oven, and roasting under an argon environment, wherein a roasting temperature is 500-600 DEG C and a heat preservation temperature is for 1-3h; and after the roasting is finished, cooling to the room temperature with the oven to obtain a roasted product, namely the titanium-doped nano tungsten oxide material. The titanium-doped nano tungsten oxide prepared with the method disclosed by the invention has the advantages of small and uniform particle size and the like; a heat preservation time in a roasting process is relatively short; and particles are guaranteed to be uniform and small, and are prevented from growing up.

Description

technical field [0001] The invention relates to a preparation method of a titanium-doped nano-tungsten oxide negative electrode material, which belongs to the technical field of lithium ion batteries. Background technique [0002] Energy is the lifeblood of the development of today's society. The depletion of fossil fuels and serious environmental pollution make the storage and application of new energy an important research hotspot. As an important energy storage system, lithium-ion batteries have attracted much attention in the field of new energy technology due to their excellent characteristics such as high reversible capacity, high voltage, high cycle performance and high energy density. Known as the leading chemical power source in the 21st century, its application fields continue to expand. However, the competition in the lithium-ion battery industry is very fierce. Finding new electrode materials with high capacity and low cost is a powerful means to further reduce ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M10/0525C01G41/02B82Y30/00
CPCB82Y30/00C01G41/02H01M4/48H01M10/0525H01M2004/027Y02E60/10
Inventor 张正富刘警峰易健宏王立丽吴天涯
Owner KUNMING UNIV OF SCI & TECH