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Conductive MOF modified carbon fiber paper intercalation material for lithium-sulfur battery

A carbon fiber paper, lithium-sulfur battery technology, applied in lithium batteries, battery electrodes, fiber raw material processing and other directions, can solve the problems of low conductivity, low efficiency of lithium polysulfide shuttle inhibition, poor cycle stability of lithium-sulfur batteries, etc. The effect of high conductivity

Active Publication Date: 2020-08-18
QILU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The object of the present invention is to provide a conductive MOF-modified carbon fiber paper as an intercalation material and preparation method for lithium-sulfur batteries, so as to solve the problem of low conductivity of existing intercalation materials and low efficiency of inhibiting lithium polysulfide shuttling and other technical problems; at the same time solve the technical problems of poor cycle stability of existing lithium-sulfur batteries

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  • Conductive MOF modified carbon fiber paper intercalation material for lithium-sulfur battery
  • Conductive MOF modified carbon fiber paper intercalation material for lithium-sulfur battery
  • Conductive MOF modified carbon fiber paper intercalation material for lithium-sulfur battery

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preparation example Construction

[0036] In a second typical embodiment of the present invention, the preparation method of the carbon fiber paper material modified by the conductive MOF is provided, the method may further comprise the steps:

[0037] Pretreatment of carbon fiber paper: hydrophilic treatment of carbon fiber paper materials;

[0038] Preparation grown with Co 3 (HITP) 2 carbon fiber paper: divalent cobalt ion Co 2+ Coordinate with hexaaminotriphenylene (HITP) on the surface of hydrophilic carbon fiber paper and grow in situ;

[0039] Removal of structural impurities: removal of Co that did not participate in the reaction 2+ , ligand HITP, solvent DMF molecules and free MOF molecules on the surface of carbon fiber paper.

[0040] In the present invention, there can be many kinds of hydrophilic treatment methods for carbon fibers, but in order to better maintain the integrity of carbon fibers and better improve the hydrophilic performance-uniformity, in some embodiments of the present inventi...

Embodiment 1

[0062] A flower-like Co 3 (HITP) 2 carbon fiber paper material, divalent cobalt ion Co 2+ Coordinate with HITP on the surface of hydrophilic carbon fiber paper and grow in situ.

[0063] The preparation method of this material comprises the following steps:

[0064] (1) Hydrophilic treatment of carbon fiber paper: cut commercial carbon fiber paper (source: physical and chemical (Hong Kong) Co., Ltd. model is N0S1005 carbon fiber paper) with a microtome and store it for later use (16mm in diameter), take deionized water and acetone respectively 10ml each of isopropanol and mix well in a 50ml beaker. Take a certain number of carbon fiber paper slices, make them completely submerged in the mixed solution, seal the beaker with paraffin parafilm and ultrasonically treat it for 60 minutes. After treatment, take it out and ultrasonically clean it with deionized water for 3 times, each time for 5 minutes, and then use absolute ethanol to ultrasonically clean it for 3 times, each t...

Embodiment 2

[0088] A flower-like Co 3 (HITP) 2 carbon fiber paper material, which is prepared by the following method:

[0089] (1) Hydrophilic treatment of carbon fiber paper: cut commercial carbon fiber paper with a microtome and store it for later use (16 mm in diameter), weigh 12 ml each of deionized water, acetone, and isopropanol, and mix them evenly in a 50 ml beaker. Take a certain number of carbon fiber paper slices, make them completely submerged in the mixture, seal the beaker with parafilm and ultrasonicate for 75 minutes. After treatment, take it out and ultrasonically clean it with deionized water for 3 times, each time for 4 minutes, and then use absolute ethanol to ultrasonically clean it for 3 times, each time for 4 minutes. The carbon fiber paper was transferred to a glass dish lined with filter paper, and dried in an oven at 100°C for 13 hours.

[0090] (2) Prepare and grow flower-like Co 3 (HITP) 2 carbon fiber paper: Use a pipette gun to pipette 500 μL each of DM...

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Abstract

The invention relates to a conductive MOF modified carbon fiber paper intercalation material for a lithium-sulfur battery as well as a preparation method and application of the conductive MOF modifiedcarbon fiber paper intercalation material. The preparation method comprises the following steps: pretreating carbon fiber paper: performing hydrophilic treatment on a carbon fiber paper material; preparing the carbon fiber paper on which Co3(HITP)2 grows: divalent cobalt ions Co<2+> and hexaamino triphenylene are coordinated and grow in situ on the surface of the hydrophilic carbon fiber paper; and removing structural impurities. The carbon fiber paper modified by the prepared conductive MOF is used as an intercalation material of the lithium-sulfur battery, wherein the carbon fiber paper provides a necessary conductive matrix, and high-speed movement of electrons between a positive electrode and a diaphragm is ensured; the Co3(HITP)2 growing on the carbon fiber paper not only can provideenough polarity for adsorbing lithium polysulfide, and fill up the deficiency of the carbon material, but also can promote the reaction of lithium polysulfide through the catalytic action of Co-N4, and the shuttle effect of polysulfide is efficiently inhibited.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, relates to nano-material technology, in particular to a preparation method and application of a conductive MOF-modified carbon fiber paper intercalation material for lithium-sulfur batteries. Background technique [0002] The statements herein merely provide background information related to the present invention and may not necessarily constitute prior art. [0003] Lithium-sulfur batteries have attracted much attention because of their theoretical capacity (1675mAh / g) and energy density (2600Wh / kg) are much larger than commercial lithium-ion batteries (<300mAh / g, <420Wh / kg), and have high research value and application prospect. However, lithium-sulfur batteries still face great challenges, the most important of which is the "shuttle effect" generated by lithium polysulfides (LiPSs), an intermediate product of the battery reaction, passing through the separator and depos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052D21H13/50
CPCH01M4/625H01M4/628H01M10/052D21H13/50Y02E60/10H01M50/417H01M50/4295H01M4/5815H01M4/136H01M4/382H01M4/583H01M2004/028H01M4/38H01M4/362D21H19/42D21H23/30D21H23/42D21H27/00
Inventor 顾少楠宋晓艺周国伟刘冰洁任永强
Owner QILU UNIV OF TECH
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