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Preparation method for high-capacity molybdenum dioxide anode material and application of high-capacity molybdenum dioxide anode material

A molybdenum dioxide and negative electrode material technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of limited capacity of negative electrode materials and inability to adapt to industrial production, achieve high specific capacity, suitable for large-scale production, improve electronic Effects of Conductivity and Ion Conductivity

Inactive Publication Date: 2012-08-01
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for preparing a high-capacity molybdenum dioxide negative electrode material, which solves the problem that the current negative electrode material has limited capacity and cannot adapt to industrial production

Method used

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  • Preparation method for high-capacity molybdenum dioxide anode material and application of high-capacity molybdenum dioxide anode material
  • Preparation method for high-capacity molybdenum dioxide anode material and application of high-capacity molybdenum dioxide anode material
  • Preparation method for high-capacity molybdenum dioxide anode material and application of high-capacity molybdenum dioxide anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, 1 gram of ammonium molybdate, 4 milliliters of deionized water, 4 milliliters of absolute alcohol and 40 milliliters of 10% polyvinyl alcohol solution were mixed to obtain a precursor solution.

[0026] Secondly, the precursor solution is subjected to an electrostatic high voltage of 8 kV to form composite nanofibers of ammonium molybdate and polyvinyl alcohol.

[0027] Then, the obtained nanofibers were first stabilized in the air. The stabilization process was to raise the temperature to 180° C. at a rate of 1° C. per minute, keep the temperature for 30 minutes, and then raise the temperature to 300° C. at the same rate, and keep the temperature for 30 minutes.

[0028] figure 1 (a) and (b) are different magnification FESEM images of ammonium molybdate and polyvinyl alcohol composite nanofibers. It can be seen that the carbon-coated molybdenum dioxide composite nanofibers obtained after stabilization in air and reduction in a reducing atmosphere maintain a ver...

Embodiment 2

[0034] Mix 1 gram of ammonium molybdate, 4 milliliters of deionized water, 4 milliliters of absolute alcohol and 40 milliliters of 10% polyvinyl alcohol solution to obtain a precursor solution. The precursor solution becomes a composite nanofiber of ammonium molybdate and polyvinyl alcohol under the action of an electrostatic high voltage of 8 kV. The obtained nanofibers are first stabilized in the air. The stabilization process is to raise the temperature to 180° C. at a rate of 1° C. per minute, keep the temperature for 30 minutes, and then raise the temperature to 300° C. at the same rate, and keep the temperature for 30 minutes. The stabilized nanofibers were then carbonized at 500°C for 12 hours in a nitrogen atmosphere to obtain molybdenum dioxide composite fibers with a carbon coating.

[0035] The carbon-coated molybdenum dioxide nanofibers obtained above were assembled into a button battery in the same manner as in Example 1, and the performance of the point was teste...

Embodiment 3

[0037] Mix 2 grams of ammonium molybdate, 8 milliliters of deionized water, 8 milliliters of absolute alcohol and 80 milliliters of 10% polyvinyl alcohol solution to obtain a precursor solution. The precursor solution becomes a composite nanofiber of ammonium molybdate and polyvinyl alcohol under the action of an electrostatic high voltage of 8 kV. The obtained nanofibers are first stabilized in the air. The stabilization process is to raise the temperature to 180° C. at a rate of 1° C. per minute, keep the temperature for 30 minutes, and then raise the temperature to 300° C. at the same rate, and keep the temperature for 30 minutes. The stabilized nanofibers were then carbonized at 700°C for 4 hours in a nitrogen atmosphere to obtain molybdenum dioxide composite fibers with a carbon coating.

[0038] The carbon-coated molybdenum dioxide nanofibers obtained above were assembled into a button battery in the same manner as in Example 1, and the performance of the point was teste...

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Abstract

The invention discloses a preparation method for a high-capacity molybdenum dioxide anode material. The method comprises the following steps of: 1) mixing de-ionized water, absolute ethanol and the solution of polyvinyl alcohol, and adding ammonium molybdate according to 0.02 to 0.04 grams per millimeter to obtain a precursor solution; 2) obtaining composite nano-fibers of the ammonium molybdate and polyvinyl alcohol by using the precursor solution under the action of 8KV static high voltage; 3) stabilizing the obtained nano-fibers in air; and 4) reducing and carbonizing the stabilized nano-fibers at high temperature in a reducing gas atmosphere to obtain a molybdenum dioxide nano-fiber composite material with a carbon coating. The invention also discloses an anode material prepared by the method, an electrode plate prepared from the anode material and a button cell comprising the electrode plate. A molybdenum dioxide nano-fiber prepared by the method has the diameter of about 120 nanometers and a length capable of reaching several microns, and the thickness of the carbon coating is about 3 nanometers; and when used as a lithium ion battery anode material, the molybdenum dioxide nano-fiber has high specific capacity, high rate capability and long cycle life.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method and application of a high-capacity negative electrode material. Background technique [0002] Lithium-ion batteries have been widely used in mobile and portable appliances due to their advantages such as high energy density, high average open circuit voltage and long cycle life. Flexible packaging lithium-ion batteries are widely used in the field of consumer electronics due to their advantages such as flexible size design and good safety performance. However, the development of miniaturization and thinning of electronic products has higher and higher energy density requirements for lithium-ion batteries, and higher and higher capacity requirements for lithium-ion battery electrode materials, especially negative electrode active materials. [0003] At present, graphite materials are mostly used as anode materials for commercialized lithium-ion batteries,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/131
CPCY02E60/122Y02E60/10
Inventor 胡先罗罗巍黄云辉孙永明李真袁利霞张五星
Owner HUAZHONG UNIV OF SCI & TECH
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