Preparation method and application of conductive adhesive based on reinforced polysulfide ion adsorption

A conductive binder and ion adsorption technology, which is applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems that active materials are difficult to be fully utilized, battery charging efficiency is reduced, etc., to achieve inhibition of polysulfide ion shuttle, excellent conductivity , the effect of improving life

Inactive Publication Date: 2020-01-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "shuttle effect" will not only reduce the charging efficiency of the battery, but also make it difficult for the active material to be fully utilized

Method used

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  • Preparation method and application of conductive adhesive based on reinforced polysulfide ion adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: the preparation of aniline solution

[0031] 2 g of aniline was dissolved in 98 mL of deionized water, and dispersed by ultrasonic vibration (ultrasonic frequency 40 kHz) for 5 minutes to obtain an aniline solution with a concentration of 2 wt%.

Embodiment 2

[0032] Example 2: Preparation of cyclodextrin inclusion compound of aniline

[0033] 3.5 g of aniline was dissolved in 96.5 mL of deionized water, and dispersed by ultrasonic vibration (ultrasonic frequency 40 kHz) for 5 minutes to obtain an aniline solution with a concentration of 3.5 wt%.

[0034] Take 40mL of deionized water to dissolve 2gβ-cyclodextrin, add aniline solution, and disperse for 30 minutes with ultrasonic vibration (ultrasonic frequency 40kHz), the aniline molecules enter the cyclodextrin cavity to form an aniline cyclodextrin inclusion compound, and after vacuum drying, we get Aniline cyclodextrin inclusion complex.

Embodiment 3

[0035] Example 3: Cyclodextrin inclusion compound polymerization of aniline

[0036] At room temperature, 5 g of aniline was dissolved in 95 mL of deionized water, and ultrasonic vibration (ultrasonic frequency 40 kHz) was dispersed for 5 minutes to obtain an aniline solution with a concentration of 5 wt%. After dissolving 5 g of β-cyclodextrin in 40 mL of deionized water, the aniline solution was added. Ultrasonic vibration (ultrasonic frequency 40kHz) disperses for 30 minutes, aniline molecules enter the cyclodextrin cavity to form an aniline cyclodextrin inclusion compound, and after vacuum drying, the aniline cyclodextrin inclusion compound is obtained;

[0037] The above-mentioned aniline-cyclodextrin inclusion compound and deionized water were prepared to prepare an aniline-cyclodextrin inclusion compound solution with a concentration of 2 wt%. Take 5mL of hydrogen peroxide (3wt%) and slowly add it dropwise to 100mL of the above-mentioned aniline-cyclodextrin inclusion c...

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Abstract

The invention relates to a lithium-sulfur battery technology, and aims to provide a preparation method of a conductive adhesive based on reinforced polysulfide ion adsorption. The preparation method comprises the following steps: adding beta-cyclodextrin dissolved by deionized water into an aniline solution, and performing ultrasonic dispersion and vacuum drying to obtain an aniline cyclodextrin inclusion compound; preparing a solution from the aniline cyclodextrin inclusion compound and deionized water; dropwise adding hydrogen peroxide, and carrying out ultrasonic dispersion to polymerize aniline in the adjacent aniline cyclodextrin inclusion compound; and drying in vacuum to obtain the conductive adhesive. Compared with a traditional binder, the product has excellent electrical conductivity, the electrode impedance can be greatly reduced, and the used binder is environmentally friendly and green. The obtained modified porous carbon has the characteristics of large specific surface area and large pore volume, can carry more sulfur, has very strong polysulfide adsorption capacity, is favorable for inhibiting shuttling of polysulfide ions due to iron oxide dispersed on the inner wall of the carbon, is suitable for preparing a high-performance sulfur electrode material, and prolongs the service life of a sulfur battery.

Description

technical field [0001] The present invention relates to a lithium-sulfur battery technology, more specifically, to a conductive binder that strengthens the adsorption of polysulfide ions and a modified macroporous carbon material that strengthens the adsorption of polysulfide ions, and based on the conductive binder and the Long-life lithium-sulfur batteries based on macroporous carbon materials. Background technique [0002] The binder used in lithium-ion batteries not only requires the binder to have basic functions and properties; such as: ensuring the uniformity and safety of the active material when making pulp; bonding the active material particles; Adhesive to the current collector; maintain the bonding between the active material and the current collector; it is beneficial to form an SEI film on the surface of the carbon material (graphite), etc., and also requires some exclusive physical and chemical properties such as: in drying and dehydration It can maintain the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525C08G73/02
CPCC08G73/0266H01M4/621H01M4/622H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 李洲鹏夏银萍刘宾虹
Owner ZHEJIANG UNIV
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