Cobaltosic oxide nanowire array, preparation method thereof as well as application of nanowire array as cathode of lithium ion battery

A technology of cobalt trioxide nanometer and line array, which is applied in the direction of battery electrodes, circuits, electrical components, etc. It can solve the problems of complex equipment and process, poor cycle performance, and poor working environment, and achieve low cost, good crystallinity, and fast migration speed Effect

Active Publication Date: 2012-07-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the initial discharge specific capacity of cobalt tetroxide prepared by these methods can reach about 1000mAh / g, but the cycle performance is poor, and it is difficult to maintain more than 1000mAh / g during the cycle, and the equipment and process used are complicated, the reaction temperature is high, the reaction time is long, and the working environment Poor, difficult to carry out industrialization, so its application is limited

Method used

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  • Cobaltosic oxide nanowire array, preparation method thereof as well as application of nanowire array as cathode of lithium ion battery
  • Cobaltosic oxide nanowire array, preparation method thereof as well as application of nanowire array as cathode of lithium ion battery
  • Cobaltosic oxide nanowire array, preparation method thereof as well as application of nanowire array as cathode of lithium ion battery

Examples

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Embodiment 1

[0034] Mix cobalt nitrate, ammonium fluoride, hexamethylenetetramine and water with a molar ratio of 1:1:5 at room temperature to obtain a uniform solution, and transfer the solution into a stainless steel lined with polytetrafluoroethylene In the high-pressure reaction kettle, the filling degree of the reaction kettle is 50%, and the clean metal titanium or cobalt substrate is placed in the solution, and the hydrothermal reaction temperature is controlled at 70°C, and the time is 12 hours. After the reaction is completed, the substrate is taken out Washing and vacuum drying are carried out to obtain a cobalt tetroxide precursor; and then the cobalt tetroxide precursor is heat-treated for 3 hours in an argon atmosphere at a temperature of 450° C. to obtain a cobalt tetroxide nanowire array. The morphology of the obtained product is as figure 1 low-magnification scanning electron microscope images of figure 2 As shown in the high-magnification scanning electron microscope pic...

Embodiment 2

[0036] Mix and stir cobalt nitrate, potassium fluoride, hexamethylenetetramine and water with a molar ratio of 1:1:5 at room temperature to obtain a uniformly mixed solution, and transfer the solution into a stainless steel lined with polytetrafluoroethylene In the high-pressure reaction kettle, the filling degree of the reaction kettle is 85%, and a clean glass or silicon substrate is placed in the solution. The hydrothermal reaction temperature is controlled at 120 ° C, and the time is 1 hour. After the reaction is completed, the substrate is taken out and Rinse and vacuum dry to obtain a cobalt tetroxide precursor; then heat treat the cobalt tetroxide precursor in an argon atmosphere at a temperature of 800° C. for 1 hour to obtain a cobalt tetroxide nanowire array.

Embodiment 3

[0038] Mix and stir cobalt acetate, sodium fluoride, hexamethylenetetramine and water with a molar ratio of 1:2:5 at room temperature to obtain a uniformly mixed solution, and transfer the solution into a stainless steel lined with polytetrafluoroethylene In the high-pressure reaction kettle, the filling degree of the reaction kettle is 50%, and the clean metal copper substrate is placed in the solution, the hydrothermal reaction temperature is controlled at 50 ° C, and the time is 48 hours. After the reaction is completed, the substrate is taken out and carried out Rinse and vacuum dry to obtain a tricobalt tetroxide precursor; then heat-treat the tricobalt tetroxide precursor in a nitrogen atmosphere at a temperature of 200° C. for 6 hours to obtain a cobalt tetraoxide nanowire array.

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Abstract

The invention relates to a cobaltosic oxide nanowire array, a preparation method thereof as well as an application of the nanowire array as a cathode of a lithium ion battery. The cobaltosic oxide nanowire array has a rhombus structure in appearance, the side length of the rhombus ranges from 100nm to 500nm, the acute angles of interior angles of the rhombus are 30-60 degrees, and the length of the array is 5-20 mu m. The invention further provides the preparation method of the cobaltosic oxide nanowire array, and the preparation method comprises the steps: mixing and stirring a cobalt salt, a chemical bonding agent, an alkaline reactant and water in certain molar ratio at normal temperature, transferring a uniformly mixed solution into a reaction kettle, placing a clean substrate into the solution for hydrothermal reaction, taking out the substrate, washing, and thermally treating the substrate in an inert atmosphere to obtain the cobaltosic oxide nanowire array. According to the invention, the cobaltosic oxide nanowire array can be directly used as the cathode of the lithium ion battery, can be used for obviously increasing the specific capacity and the cycle performance of the battery, has the discharge capacity up to more than 1000mAh / g, and is an ideal electrode material of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of nanometer functional materials, and in particular relates to a cobalt trioxide nanowire array, a preparation method thereof and an application as a negative electrode of a lithium ion battery. Background technique [0002] The physical and chemical properties of nanomaterials largely depend on their structure, size and shape. One-dimensional (1D) nanostructured materials (e.g., nanowires, nanobelts, and nanotubes) have attracted extensive interest in recent decades for their potential practical applications not only in optics, electronics, but also in energy storage. [0003] Cobalt tetroxide is an important transition metal oxide, a typical p-type semiconductor, with a spinel structure. Due to its unique magnetic, optical, electronic and electrochemical properties, cobalt tetroxide is widely used in lithium-ion batteries, catalysis, gas sensors, solar energy absorption, photochromic and magnetic materials and oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B81B7/04B81C1/00H01M4/525H01M4/131
CPCY02E60/122Y02E60/10
Inventor 朱丽萍梅伟民
Owner ZHEJIANG UNIV
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