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Negative electrode of lithium battery for inhibiting growth of lithium dendrites with ZIF-8 porous carbon material

A ZIF-8, porous carbon material technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc., can solve the problems of high cost and complex preparation methods, achieve growth inhibition, improve cycle performance, high ratio The effect of surface area

Active Publication Date: 2018-07-06
中能智源(苏州)科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the porous materials used in lithium dendrite suppression have complex preparation methods and high cost. The key to suppress dendrite growth is to find porous materials with controllable pore structure, excellent electrochemical performance, simple synthesis method and low cost.

Method used

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  • Negative electrode of lithium battery for inhibiting growth of lithium dendrites with ZIF-8 porous carbon material
  • Negative electrode of lithium battery for inhibiting growth of lithium dendrites with ZIF-8 porous carbon material
  • Negative electrode of lithium battery for inhibiting growth of lithium dendrites with ZIF-8 porous carbon material

Examples

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Effect test

Embodiment 1

[0027] A lithium battery negative electrode utilizing a ZIF-8 porous carbon material to suppress the growth of lithium dendrites, comprising the following steps:

[0028] (1) Under the condition of magnetic stirring, 7.71g metal nitrate Zn(NO 3 ) 2 ·6H 2 O was dissolved in 750ml of anhydrous methanol to form a colorless and clear solution A; 9.84g of organic ligand 2-methylimidazole was dissolved in the above solution to form a clear solution B, and the clear solution B continued to be magnetically stirred until it became turbid to form an emulsion. The prepared emulsion was aged for 24 h, centrifuged at 6000 rad / min and washed 3 times to obtain a white paste. The prepared white paste was dried in a blast dryer at 60°C for 8 hours, and dried in a vacuum oven at 105°C for 6 hours to obtain a ZIF-8 zeolite imidazolate skeleton;

[0029] (2) Grind the dried ZIF-8 material in an agate mortar for 30 min, and keep it in a tube furnace with a nitrogen atmosphere at 900 °C for 5 h ...

Embodiment 2

[0036] A lithium battery negative electrode utilizing a ZIF-8 porous carbon material to suppress the growth of lithium dendrites, comprising the following steps:

[0037] (1) Under the condition of magnetic stirring, 7.71g metal nitrate Zn(NO 3 ) 2 ·6H 2 O was dissolved in 750ml of anhydrous methanol to form a colorless and clear solution A; 9.84g of organic ligand 2-methylimidazole was dissolved in the above solution to form a clear solution B, and the clear solution B continued to be magnetically stirred until it became turbid to form an emulsion. The prepared emulsion was aged for 24 h, centrifuged at 6000 rad / min and washed 3 times to obtain a white paste. The prepared white paste was dried in a blast dryer at 60°C for 8 hours, and dried in a vacuum oven at 105°C for 6 hours to obtain a ZIF-8 zeolite imidazolate skeleton;

[0038] (2) Grind the dried ZIF-8 material in an agate mortar for 30 min, and keep it in a tube furnace with a nitrogen atmosphere at 800 °C for 5 h ...

Embodiment 3

[0044] A preparation method of a lead-carbon battery negative electrode based on a ZIF-8 zeolite imidazolate framework porous carbon nanomaterial, comprising the following steps:

[0045] (1) Under the condition of magnetic stirring, 7.71g metal nitrate Zn(NO 3 ) 2 ·6H 2 O was dissolved in 750ml of anhydrous methanol to form a colorless and clear solution A; 9.84g of organic ligand 2-methylimidazole was dissolved in the above solution to form a clear solution B, and the clear solution B continued to be magnetically stirred until it became turbid to form an emulsion. The prepared emulsion was aged for 24 h, centrifuged at 7000 rad / min and washed 3 times to obtain a white paste. The prepared white paste was dried in a blast dryer at 60°C for 8 hours, and dried in a vacuum oven at 105°C for 6 hours to obtain a ZIF-8 zeolite imidazolate skeleton;

[0046] (2) Grind the dried ZIF-8 material in an agate mortar for 30 min, and keep it in a tube furnace with a nitrogen atmosphere a...

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Abstract

The invention discloses a negative electrode of a lithium battery for inhibiting the growth of lithium dendrites with a ZIF-8 porous carbon material, and belongs to the technical field of negative electrodes of lithium batteries. The ZIF-8 porous carbon material is a porous carbon material prepared by annealing a zeolite imidazolate framework material ZIF-8 in an inert atmosphere; a surface of a metal lithium sheet is coated with the ZIF-8 porous carbon material through simple physical coating to form a porous carbon-coated metal lithium negative electrode. The lithium battery can effectivelyinhibit the growth of the lithium dendrites on the surface of the negative electrode during charging and discharging, not only has superior cycling performance, but also reduces safety hazards in useof batteries, and can be used for the negative electrodes of commercial large lithium batteries.

Description

technical field [0001] The invention relates to a lithium battery negative electrode which uses ZIF-8 porous carbon material to suppress the growth of lithium dendrites, and belongs to the technical field of lithium battery negative electrodes. technical background [0002] The generation of lithium dendrites is mainly due to the uneven deposition of lithium ions on the electrode surface, resulting in the rapid deposition of lithium at the active point of the electrode. As the number of battery cycles increases, the degree of lithium deposition gradually increases. Under certain conditions, the deposited lithium is oriented Lithium dendrites are generated, piercing the diaphragm, causing a short circuit inside the battery, and causing a safety accident. In terms of the electrochemical performance of the battery, as the battery charges and discharges, the continuously growing lithium dendrites will continue to consume lithium ions. Even if the lithium dendrites do not break t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/0525H01M4/66H01M4/133
CPCH01M4/133H01M4/583H01M4/625H01M4/667H01M10/0525Y02E60/10
Inventor 汪浩徐小龙刘晶冰严辉
Owner 中能智源(苏州)科技发展有限公司
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