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Preparation method of cobalt-doped nano tungsten oxide negative electrode material

A technology of nano-tungsten oxide and negative electrode materials, applied in the direction of tungsten oxide/tungsten hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of poor rate performance and cycle stability, small environmental toxicity, and volume change Large and other problems, to achieve the effect of improved electrochemical performance, short holding time and simple process

Active Publication Date: 2017-05-10
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Preparation method of cobalt-doped nano tungsten oxide negative electrode material
  • Preparation method of cobalt-doped nano tungsten oxide negative electrode material
  • Preparation method of cobalt-doped nano tungsten oxide negative electrode material

Examples

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Embodiment 1

[0020] The preparation method of the cobalt-doped nano-tungsten oxide negative electrode material described in this embodiment specifically includes the following steps:

[0021] (1) Mix ammonium metatungstate, cobalt nitrate, and dimethylimidazole in a molar ratio of 5:1:1, then add 200mL deionized water to prepare a mixed solution, disperse and dissolve for 1h with ultrasonic vibration, and use 1mol / L The pH value was adjusted to 2 with hydrochloric acid, and the solution was transferred to a stainless steel reactor with a polytetrafluoroethylene liner, heated to 170°C and kept for 5 days, and then naturally cooled to room temperature.

[0022] (2) Pour out the mixture 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.

[0023] (3) Place the dried powder in step (2) in an atmosphere furnace, heat it up to 500°C rapidly at a heating rate of 9°C / min in an air atmosphere, keep it warm for 90 ...

Embodiment 2

[0029] The preparation method of the cobalt-doped nano-tungsten oxide negative electrode material described in this embodiment specifically includes the following steps:

[0030] (1) Mix ammonium metatungstate, cobalt nitrate and dimethylimidazole at a molar ratio of 6:1:1, then add 200mL deionized water to prepare a mixed solution, disperse and dissolve with ultrasonic vibration for 2h, and use 1.5mol / Adjust the pH value to 1 with 1 L of hydrochloric acid, transfer the solution to a stainless steel reaction kettle with a polytetrafluoroethylene liner, put it into a drying oven for heating, keep it at 160°C for 4 days, and then cool it down to room temperature naturally.

[0031] (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.

[0032] (3) Place the dried precipitate in step (2) in an atmosphere furnace, rapidly heat it up to 550°C at a heating rate of 8°C / ...

Embodiment 3

[0036] The preparation method of the cobalt-doped nano-tungsten oxide negative electrode material described in this embodiment specifically includes the following steps:

[0037] (1) Mix ammonium metatungstate, cobalt nitrate and dimethylimidazole at a molar ratio of 6:1:1, then add 200mL deionized water to prepare a mixed solution, disperse and dissolve with ultrasonic vibration for 1h, and use 2mol / L Adjust the pH value to 1 with hydrochloric acid, transfer the solution to a stainless steel reaction kettle with a polytetrafluoroethylene liner, put it in a drying oven for heating, keep it at 180°C for 6 days, cool it naturally to room temperature, and then cool it down to room temperature with the furnace.

[0038] (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.

[0039] (3) Place the dried precipitate in step (2) in a microwave oven, rapidly heat it up to ...

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Abstract

The invention discloses a preparation method of a cobalt-doped nano tungsten oxide negative electrode material and belongs to the technical field of lithium-ion batteries. The method comprises the following steps of adding ammonium metatungstate, cobalt nitrate and dimethyl imidazole to deionized water to prepare a mixed solution, carrying out vibration dispersion by using an ultrasonic generator, adjusting the pH value to 1-2, transferring the solution into a stainless steel reaction kettle, reacting at 170 DEG C for 4-6 days and naturally cooling to a room temperature; filtering the solution, washing the solution by using the deionized water and ethyl alcohol for multiple times and drying; putting the dried uniform powder into an aluminum oxide crucible, putting the aluminum oxide crucible into an atmosphere furnace and roasting in an air environment, wherein the roasting temperature is 500-600 DEG C and the heat preservation temperature is 1-2 hours; carrying out furnace cooling after roasting is completed to obtain a roasted product, namely the cobalt-doped nano tungsten oxide material; and taking out the product and grinding the product to obtain fine cobalt-doped nano tungsten oxide material. The cobalt-doped nano tungsten oxide material prepared by the method has the advantage of being small and uniform in particle size, the heat preservation time in the roasting process is relatively short, uniform and fine particles are ensured and growth of the particles is avoided.

Description

technical field [0001] The invention relates to a preparation method of a cobalt-doped nano-tungsten oxide negative electrode material, which belongs to the technical field of lithium ion batteries. Background technique [0002] With the development of social economy and the rapid growth of population, energy and environmental issues have become two severe issues that must be faced in the 21st century, and the development of clean and renewable new energy has become a major research hotspot in the world today. Chemical power supply, especially secondary power supply, as a device that can realize mutual conversion of chemical energy and electrical energy, is a key device for rational and effective use of energy, and is one of the important means to solve energy problems at present. Among many series of batteries such as lead-acid batteries, nickel-cadmium batteries, and nickel-hydrogen batteries, lithium-ion secondary batteries have become the world's leading battery research...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M10/0525B82Y30/00
CPCH01M4/48H01M10/0525B82Y30/00C01G41/02C01P2002/72C01P2004/04C01P2004/64C01P2004/80C01P2006/40Y02E60/10
Inventor 张正富刘警峰易健宏王立丽冷崇燕
Owner KUNMING UNIV OF SCI & TECH
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