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ZIF-8-derived lithium ion negative electrode material and preparation method thereof

A technology of ZIF-8 and negative electrode materials, which is applied in the direction of battery electrodes, electrochemical generators, structural parts, etc., can solve the problems of complex preparation methods, unsuitable for large-scale production, poor cycle stability, etc., and achieve rich sources and good Application prospect, effect of improving productivity

Pending Publication Date: 2022-08-02
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is complicated, the product is impure, the experiment requirements are high, the cost is large, the yield is low, and it is not suitable for large-scale production; at the same time, the prepared ZIF-8 has poor cycle stability during lithium ion charging and discharging. , low capacity and other defects

Method used

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  • ZIF-8-derived lithium ion negative electrode material and preparation method thereof
  • ZIF-8-derived lithium ion negative electrode material and preparation method thereof
  • ZIF-8-derived lithium ion negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] First measure 30ml of CH 3 OH solution and 150ml of deionized water were placed together in a 200ml beaker to form mixed solution A, and a magnetic stirrer was added to stir on a magnetic stirring table, and then 0.52g of Zn(NO) was weighed separately. 3 ) 2 ·6H 2 O and 0.72g of 2-methylimidazole were placed in a mortar, fully ground to make it evenly mixed, the mixed drug was slowly added to the mixed solution A and sonicated for 5 min under the action of an ultrasonic machine to fully dissolve the mixed drug to obtain a mixed solution. Solution B, the mixed solution B has become turbid (such as figure 1), then the mixed solution B was placed on a magnetic stirring table and stirred at a speed of 600 r / min for 8 h, and the obtained precipitate was centrifuged, filtered, and washed with CH 3 Wash it with OH solution 3 times, collect the precipitate after washing, put it in a vacuum drying box, and vacuum dry it at 60 °C for 12 h to obtain ZIF-8. Finally, put ZIF-8 in...

Embodiment 2

[0047] First measure 60ml of CH 3 OH solution and 180ml of deionized water were placed together in a 300ml beaker to form mixed solution A, and a magnetic stirring bar was added to stir on a magnetic stirring table, and then 1.04g of Zn(NO) was weighed separately. 3 ) 2 ·6H 2 O and 1.15g of 2-methylimidazole were placed in a mortar, fully ground to make it evenly mixed, the mixed drug was slowly added to the mixed solution A and sonicated for 5 min under the action of an ultrasonic machine, so that the mixed drug was fully dissolved to obtain a mixed solution. Solution B, the mixed solution B has become turbid (such as Image 6 ), then the mixed solution B was placed on a magnetic stirring table and stirred at a speed of 600 r / min for 8 h, and the obtained precipitate was centrifuged, filtered, and washed with CH 3 Wash it with OH solution 3 times, collect the precipitate after washing, put it in a vacuum drying box, and vacuum dry it at 60 °C for 12 h to obtain ZIF-8. Fina...

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Abstract

The invention belongs to the technical field of preparation of lithium ion battery electrode materials, and particularly relates to a ZIF-8-derived lithium ion negative electrode material and a preparation method thereof, and the material is prepared by a simple coprecipitation method and a heat treatment process. The preparation method provided by the invention has the advantages of being simple and easy to operate, high in material yield, high in rate, stable in structure, large in particle dispersion coefficient, low in cost, green, environment-friendly and the like, and the obtained ZIF-8-derived lithium ion battery negative electrode material is uniform and controllable in morphology, free of agglomeration phenomenon, large in specific surface area, rich in central active sites, and suitable for industrial production. And when being used as an electrode material, the composite material shows relatively high specific discharge capacity and electrochemical characteristics, and can meet the requirements of preparing a high-performance lithium ion battery electrode material.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium ion battery electrode materials, in particular to a lithium ion negative electrode material derived from ZIF-8 and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life and no memory effect, and have been widely used. At present, the negative electrode material of commercial lithium-ion batteries is graphite electrode, but its theoretical specific capacity is only 372mA h / g, and when the battery is charged and discharged at a high rate, the graphite electrode is prone to produce lithium dendrites, which makes the internal structure of the battery suffer. damage, leading to security issues. [0003] As an electrode material for lithium-ion batteries, ZIF-8 has many advantages, such as abundant redox active sites, abundant resources, high yield, strong temperature adaptability, and universality, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/139H01M10/0525
CPCH01M4/36H01M4/139H01M10/0525H01M2004/027Y02E60/10
Inventor 秦清清钱森森李伟伟刘孝伟李俊哲于潇
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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