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Preparation method and application of cobaltosic oxide porous fiber material

A technology of cobalt tetroxide and porous fibers, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of low coulombic efficiency and low cycle life, and achieve the effects of improving coulombic efficiency, good reproducibility and simple process

Active Publication Date: 2016-10-26
蔡庆忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems of low coulombic efficiency and low cycle life of the existing cobalt tetroxide as the negative electrode material of lithium-ion batteries, the present invention provides a preparation method and application of a porous fiber material of cobalt tetroxide

Method used

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  • Preparation method and application of cobaltosic oxide porous fiber material
  • Preparation method and application of cobaltosic oxide porous fiber material
  • Preparation method and application of cobaltosic oxide porous fiber material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of preparation method of tricobalt tetraoxide porous fiber material, concrete steps are as follows:

[0035] 1. Preparation of soluble cobalt salt solution: Add 0.449g of cobalt acetate and 0.225g of L-glutamic acid into a beaker filled with 50ml of water, and keep stirring at room temperature until they are completely dissolved.

[0036] 2. Preparation of ethanol solution of trimesic acid: Add 0.561 g of trimesic acid into a beaker filled with 50 ml of absolute ethanol, and keep stirring at room temperature until it is completely dissolved.

[0037] 3. Preparation of cobalt-based metal-organic framework fibers: adding the solution in step 2 to the solution in step 1 dropwise and stirring continuously for 24 hours to obtain cobalt-based metal-organic framework fibers. The obtained fiber has a diameter of about 2 μm and a length of about 30 μm, such as figure 2 shown.

[0038] 4. Preparation of cobalt tetroxide porous fiber material: the cobalt-based metal-organi...

Embodiment 2

[0042] 1. Preparation of soluble cobalt salt solution: Add 0.427g of cobalt chloride and 0.285g of L-glutamic acid into a beaker filled with 50ml of water, and keep stirring at room temperature until they are completely dissolved.

[0043] The other steps were the same as in Example 1, and the diameter of the obtained composite fiber was about 1.2 μm.

Embodiment 3

[0045] 1. Preparation of soluble cobalt salt solution: Add 0.435g of cobalt nitrate and 0.325g of L-glutamic acid into a beaker filled with 50ml of water, and keep stirring at room temperature until they are completely dissolved.

[0046] Other steps are the same as in Example 1, and the diameter of the obtained composite fiber is about 1.3 μm.

[0047] Table 1 shows the capacities obtained in the first cycle and the 50th cycle of the charge-discharge test of the lithium-ion batteries of Examples 1-3 at a current of 0.1C.

[0048] Table 1

[0049]

[0050] It can be seen from Table 1 that the porous fiber of tricobalt tetroxide of the present invention is used as an electrode material and applied to a lithium-ion battery. After 50 cycles, the capacity retention rate is above 85.9%, which has a good cycle performance and is still much higher than the current commercial Graphite anode material.

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Abstract

The invention discloses a cobaltosic oxide porous fiber material and a preparation method and application thereof. The fiber material is prepared from a cobalt salt, a trimesic acid and an L-glutamic acid. The preparation method comprises the steps of: adding a trimesic acid solution dissolved into ethanol or methanol to a mixed water solution of the cobalt salt and the L-glutamic acid for stirring for 24-36 hours; carrying out centrifugal separation and carrying out washing and precipitating through the ethanol and deionized water for three times in sequence to obtain a cobalt-based metal organic skeleton fiber; and putting the cobalt-based metal organic skeleton fiber into a tube furnace, carrying out heating to 550-600 DEG C under air atmosphere protection at the rate of 1-6 DEG C / min, keeping the temperature for 2-6 hours and then naturally cooling the product to a room temperature to obtain the cobaltosic oxide porous fiber material. The cobaltosic oxide porous fiber material is applied to a lithium-ion battery, so that the initial coulomb efficiency (82.9%) of the lithium battery can be improved; the cycle lifetime (the capacity retention ratio is 85.9% after 50 cycles) of the lithium battery can be prolonged; the technology is simple; the repeatability is good; and the preparation method is easy to implement and suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium-ion batteries, in particular to a porous fiber material of tricobalt tetroxide for lithium-ion batteries, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high capacity, small size, light weight, no memory effect, small self-discharge and long cycle life, making them a new chemical power source with great potential in the 21st century. At present, the theoretical capacity of the negative electrode material graphite in commercial lithium batteries is only 372mAh / g, which cannot meet the application requirements of high-performance batteries. Therefore, the development of anode materials with higher capacity, long cycle life and high rate performance has become the goal pursued by researchers at home and abroad. Among them, the transition metal oxide tricobalt tetroxide (Co 3 o 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/62Y02E60/10
Inventor 孙孟飞杨宏训宋旺华孙明琛孙胜男聂宇
Owner 蔡庆忠