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Preparation method and application of graphite and cobalt-based metal organic framework composite materials for negative electrode of lithium ion battery

A lithium-ion battery and organic framework technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of small layer spacing of graphite materials, affect battery cycle life, destroy conductive network, etc., and achieve simple preparation method and easy operation , Improve the effect of cycle life

Pending Publication Date: 2019-06-18
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite is one of the most commonly used materials for the negative electrode of lithium-ion batteries today, but the layer spacing of graphite materials is small. During the intercalation / intercalation process of lithium ions, the structure of graphite will change, resulting in electrode pulverization, destroying the conductive network, and affecting the battery. cycle life

Method used

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  • Preparation method and application of graphite and cobalt-based metal organic framework composite materials for negative electrode of lithium ion battery
  • Preparation method and application of graphite and cobalt-based metal organic framework composite materials for negative electrode of lithium ion battery
  • Preparation method and application of graphite and cobalt-based metal organic framework composite materials for negative electrode of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 1mol cobalt acetate and 1.5mol organic matrix isophthalic acid are mixed evenly to obtain a cobalt acetate-organic matrix isophthalic acid mixture; the cobalt acetate-organic matrix isophthalic acid mixture and graphite are in a mass ratio of 1:20 Mix to obtain graphite mixture;

[0028] (2) Add 3mol N-N dimethylformamide to the graphite mixture, stir it evenly, pour it into a hydrothermal reaction kettle, heat it to 130°C, and heat it for 15 hours; after the reaction is completed, pour it out and wash it with distilled water, and settle to remove the upper layer The supernatant was kept, and the precipitate was washed repeatedly with distilled water for 3 times, then centrifuged at 6000r / min for 10 minutes, the supernatant was removed, and the precipitate was kept;

[0029] (3) Disperse the precipitate obtained after centrifugation under 240W ultrasonic conditions for 2.5 hours at room temperature; then dry at 80° C. for 12 hours and cool to obtain graphite and cob...

Embodiment 2

[0032] (1) 1mol cobalt acetate and 2mol organic matrix isophthalic acid are mixed uniformly to obtain a cobalt acetate-organic matrix isophthalic acid mixture; the cobalt acetate-organic matrix isophthalic acid mixture and graphite are combined according to a mass ratio of 1:20 , to obtain graphite mixture;

[0033] (2) Add 2mol N-N dimethylformamide to the graphite mixture, stir evenly, pour it into a hydrothermal reaction kettle, heat to 150°C, and heat for 18 hours;

[0034] (3) Take out the reactant in the hydrothermal reaction kettle, wash it with distilled water, settle and discard the supernatant, keep the sediment, wash it repeatedly with distilled water 4 times, then centrifuge at 4000r / min for 15 minutes, remove the supernatant , to retain the sediment;

[0035] (4) The precipitate obtained after centrifugation was dispersed under 240W ultrasonic conditions for 3 hours at room temperature, and then dried at 80° C. for 14 hours to obtain a composite material of graph...

Embodiment 3

[0037] (1) Mix 1mol cobalt acetate and 2.5mol organic matrix isophthalic acid evenly to obtain a cobalt acetate-organic matrix isophthalic acid mixture; mix cobalt acetate-organic matrix isophthalic acid mixture and graphite according to the mass ratio of 1:6 Mix to obtain graphite mixture;

[0038] (2) Add 4mol N-N dimethylformamide to the graphite mixture, stir evenly, pour it into a hydrothermal reaction kettle, heat to 180°C, and heat for 20 hours;

[0039] (3) The reactant in the hydrothermal reaction kettle was taken out, washed with absolute ethanol, settled and discarded the supernatant, retained the precipitate, washed repeatedly with absolute ethanol 5 times, then centrifuged at 7000r / min for 12 minutes, Remove the supernatant and keep the precipitate;

[0040] (4) The precipitate obtained after centrifugation was dispersed under 240W ultrasonic conditions for 3 hours at room temperature, and then dried at 80° C. for 14 hours to obtain a composite material of graphi...

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Abstract

The invention discloses a preparation method and application of graphite and cobalt-based metal organic framework composite materials for negative electrode of a lithium ion battery. The method comprises the following steps of mixing cobalt acetate with organic matrix isophthalic acid and uniformly dispersing the mixture, fully mixing the mixture with graphite to obtain a cobalt acetate-organic matrix isophthalic acid graphite mixture; adding N-N dimethylformamide to the graphite mixture, pouring into a hydrothermal reaction kettle after uniform stirring for hydrothermal reaction; taking out the reactant obtained in the hydrothermal reaction kettle for washing and sedimentation to discard the supernatant and retain the precipitate for further centrifugation; and drying the precipitate obtained after centrifugation after being ultrasonically dispersed at room temperature to obtain a graphite and cobalt-based metal organic framework composite. The preparation method and application of graphite and cobalt-based metal organic framework composite materials for negative electrode of a lithium ion battery have the advantages that the preparation method is simple and easy to operate, and the obtained graphite and cobalt-based metal organic framework composite material can effectively improve the volume change brought about by the charging and discharging process of the graphite by being used as an active material of the negative electrode of a lithium ion battery, thereby improving the cycle life of the battery.

Description

technical field [0001] The invention relates to a preparation method and application of graphite and cobalt-based metal-organic framework composite materials for negative electrodes of lithium ion batteries. Background technique [0002] Lithium-ion battery is a kind of chemical power source, which has been widely used in portable electronic devices such as notebook computers and mobile phones. Lithium-ion batteries are made by embedding lithium ions in carbon (petroleum coke and graphite) to form the negative electrode. Petroleum coke and graphite are used as negative electrode materials, and lithium ions are embedded in carbon, which overcomes the high activity of lithium and is safe to use. Graphite is one of the most commonly used materials for the negative electrode of lithium-ion batteries today, but the layer spacing of graphite materials is small. During the intercalation / intercalation process of lithium ions, the structure of graphite will change, resulting in elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M4/133H01M10/0525
CPCY02E60/10
Inventor 郎笑石刘颖李兰刘凡徐天野朱书秒蔡克迪
Owner BOHAI UNIV
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