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Nanoparticle-compounded ZIF-8 negative electrode material of high specific capacity bismuth as well as preparation method and application of nanoparticle-compounded ZIF-8 negative electrode material

A ZIF-8, high specific capacity technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., to achieve the effect of mild conditions, high yield and simple method

Inactive Publication Date: 2018-11-16
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the Bi@Nitrogen-doped Carbon (Bi@NC) composite with a special morphology is formed by combining metal Bi with a metal covalent organic compound (ZIF-8) and then carbonizing it, which effectively relieves the metal Bi from charging. The volume expansion effect during the discharge process also improves the problem of its poor conductivity, thereby improving its reversible capacity and cycle stability, thereby significantly improving its electrochemical performance

Method used

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  • Nanoparticle-compounded ZIF-8 negative electrode material of high specific capacity bismuth as well as preparation method and application of nanoparticle-compounded ZIF-8 negative electrode material
  • Nanoparticle-compounded ZIF-8 negative electrode material of high specific capacity bismuth as well as preparation method and application of nanoparticle-compounded ZIF-8 negative electrode material
  • Nanoparticle-compounded ZIF-8 negative electrode material of high specific capacity bismuth as well as preparation method and application of nanoparticle-compounded ZIF-8 negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) 3mmol zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 (2) and 6mmol 2-methylimidazole (MeIm) are added respectively in 40mL absolute methanol, ultrasonic 30min, until both solutions become uniform and clear;

[0050] (2) Zinc nitrate hexahydrate (Zn(NO) in step (1) 3 ) 2 ·6H 2 O) solution is poured in 2-methylimidazole (MeIm) solution, under 600rpm continuous mechanical stirring 30min, appears white turbidity to solution;

[0051] (3) Transfer the mixed solution in step (2) to a 100mL polytetrafluoroethylene autoclave, let it stand at 100°C for 12h, centrifuge to remove the supernatant and wash the lower precipitate with anhydrous methanol 3 times, then washed 3 times with ultrapure water and dried at 80°C for 18 hours to obtain a white ZIF-8 precursor;

[0052] (4) Put the dried white ZIF-8 precursor in step (3) into a corundum ark, and carbonize at 600°C for 2 hours in a nitrogen protective atmosphere to obtain a black Zn@NC intermediate product;

[0053] (5) A...

Embodiment 2

[0061] (1) 1mmol zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 (2) and 2mmol 2-methylimidazole (MeIm) are added respectively in 40mL absolute methanol, ultrasonic 30min, until both solutions become uniform and clear;

[0062] (2) Zinc nitrate hexahydrate (Zn(NO) in step (1) 3 ) 2 ·6H 2 O) solution is poured in 2-methylimidazole (MeIm) solution, under 400rpm continuous mechanical stirring 20min, appears white turbidity to solution;

[0063] (3) Transfer the mixed solution in step (2) to a 100mL polytetrafluoroethylene autoclave, let it stand at 110°C for 16h, centrifuge, remove the supernatant and wash the lower layer with anhydrous methanol Wash 3 times, then wash 3 times with ultrapure water, and then dry at 70°C for 20 hours to obtain the white ZIF-8 precursor;

[0064] (4) Put the dried white ZIF-8 precursor in step (3) into a corundum ark, and carbonize it at 500°C for 4 hours in a nitrogen protective atmosphere to obtain a black Zn@NC intermediate product;

[0065] (...

Embodiment 3

[0068] (1) 2mmol zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 (2) and 4mmol 2-methylimidazole (MeIm) are added respectively in 40mL of absolute methanol, ultrasonic 30min, until both solutions become uniform and clear;

[0069] (2) Zinc nitrate hexahydrate (Zn(NO) in step (1) 3 ) 2 ·6H 2 O) solution is poured in 2-methylimidazole (MeIm) solution, under 500rpm continuous mechanical stirring 10min, appears white turbidity to solution;

[0070] (3) Transfer the mixed solution in step (2) to a 100mL polytetrafluoroethylene autoclave, let it stand at 120°C for 18h, centrifuge, remove the supernatant, and use anhydrous methanol to precipitate the lower layer first. Washing 3 times, then washing 3 times with ultrapure water, and then drying at 60°C for 24h to obtain a white ZIF-8 precursor;

[0071] (4) Put the dried white ZIF-8 precursor in step (5) into a corundum ark, and carbonize it at 700°C for 2 hours in a nitrogen protective atmosphere to obtain a black Zn@NC intermediat...

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Abstract

The invention belongs to the field of lithium ion batteries, and discloses a nanoparticle-compounded ZIF-8 negative electrode material of high specific capacity bismuth as well as a preparation methodand application of the nanoparticle-compounded ZIF-8 negative electrode material. The environment in a methanol solution is utilized to enable zinc ions (Zn<2+>) in zinc nitrate hexahydrate to cooperate with a 2-methylimidazole ligand to form a ZIF-8 precursor, after the precursor is subjected to high-temperature carbonization treatment in an inert gas shielding atmosphere of nitrogen gas, Zn<2+>is reduced by pyrolytic carbon in the ZIF-8 to zinc elementary substance (Zn) to form Zn@NC, finally, Bi replaces Zn in situ through simple replacement reaction (Bi<3+> plus Zn arrow Bi plus Zn<2+>)so as to obtain Bi@NC finally. The obtained Bi@NC greatly improves the conductivity of Bi, is conducive to reduction of internal resistance and transmission of electrons, and improves the performanceof reaction kinetics; meanwhile, the volume expansion of Bi@NC in the charging and discharging processes is eased, and the reversible specific capacity and cyclic stability of Bi@NC are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a high specific capacity bismuth nanoparticle composite ZIF-8 negative electrode material and its preparation method and application. Background technique [0002] Compared with commercial secondary batteries, lithium-ion batteries have the advantages of high working voltage, high specific capacity, large output power, good cycle performance, fast charging, no memory effect, green environmental protection, etc., and they have broad applications as energy storage batteries Prospects. However, with the continuous development of society and the advancement of science and technology, as people's demand for energy storage devices with small size, high energy density, and long service life increases, the demand for improving the volume specific capacity and mass specific capacity of the battery appears. Increasingly urgent, so improving the energy density of lithium batteries has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 李伟善钟耀棠许淑媛李晓萍叶常春
Owner SOUTH CHINA NORMAL UNIVERSITY
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