Carbon composite material chemically modified by metal phthalocyanine complex, battery cathode material and preparation method and application thereof

A carbon composite material, metal phthalocyanine technology, applied in chemical instruments and methods, battery electrodes, organic compounds/hydrides/coordination complex catalysts, etc. It can improve the capacity and cycle life, promote the transfer of electrons, and improve the utilization rate of sulfur.

Inactive Publication Date: 2020-07-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the certain density difference between sulfur and lithium sulfide, the positive electrode will experience volume expansion and contraction of up to 79% during charge and discharge, which will lead to fatigue damage of the positive electrode structure during cycling
[0005] (2) Poor electrical conductivity of positive electrode material active material sulfur and its discharge product lithium sulfide, low utilization rate, which is not conducive to high rate performance and long-term cycle stability of the battery
However, the inventors found that the core of these methods is the adsorption and confinement of polysulfides, which can improve the capacity and cycle life of the battery; compounds such as phosphides and sulfides can play a certain catalytic role, but the catalytic The utilization rate of materials needs to be further improved

Method used

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  • Carbon composite material chemically modified by metal phthalocyanine complex, battery cathode material and preparation method and application thereof
  • Carbon composite material chemically modified by metal phthalocyanine complex, battery cathode material and preparation method and application thereof
  • Carbon composite material chemically modified by metal phthalocyanine complex, battery cathode material and preparation method and application thereof

Examples

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Effect test

no. 1 example

[0065] 1. The preparation of a carbon composite material chemically modified by a metal phthalocyanine complex comprises the following steps:

[0066] (1) Mix 1 g of fluorinated multi-walled carbon nanotubes, 2 g of cobalt tetraaminophthalocyanine, and 200 ml of dimethyl sulfoxide, and add 200 μl of pyridine dropwise under a nitrogen atmosphere, and slowly raise the temperature of the reaction system to 170 ° C. atmosphere, reflux reaction for 12h.

[0067] (2) After the reaction is completed, the obtained product is separated by filtration, and the reacted substance is washed repeatedly with dimethyl sulfoxide, N,N dimethylformamide, methanol, ethanol, and deionized water in sequence, and after freeze-drying, The solid is collected to obtain multi-walled carbon nanotubes chemically modified by cobalt tetraaminophthalocyanine.

[0068] 2. A preparation of a positive electrode material for a lithium-sulfur battery, comprising the steps of:

[0069] (3) Weigh 1.5 g of the abov...

no. 2 example

[0078] 1. The preparation of a carbon composite material chemically modified by a metal phthalocyanine complex comprises the following steps:

[0079] (1) Mix 1 g of brominated multi-walled carbon nanotubes, 2 g of nickel tetraaminophthalocyanine, and 200 ml of dimethyl sulfoxide evenly, add 200 μl of pyridine dropwise under nitrogen atmosphere, and slowly raise the temperature of the reaction system to 180 ° C, keeping nitrogen atmosphere, reflux reaction for 12 hours.

[0080] (2) After the reaction is completed, the obtained product is separated by filtration, and the reacted substance is repeatedly washed with dimethyl sulfoxide, N,N dimethylformamide, methanol, ethanol, and deionized water, and collected after freeze-drying solid, namely the multi-walled carbon nanotubes chemically modified by tetraaminophthalocyanine nickel.

[0081] 2. A preparation of a positive electrode material for a lithium-sulfur battery, comprising the steps of:

[0082](3) Weigh 1.5 g of tetra...

no. 3 example

[0089] 1. The preparation of a carbon composite material chemically modified by a metal phthalocyanine complex comprises the following steps:

[0090] (1) Mix 1g of brominated multi-walled carbon nanotubes, 2g of manganese tetraaminophthalocyanine, and 250ml of toluene evenly, add 180μl of 4-dimethylaminopyridine dropwise under a nitrogen atmosphere, and slowly raise the temperature of the reaction system to 170°C and keep Nitrogen atmosphere, reflux reaction for 12 hours.

[0091] (2) After the reaction is completed, the obtained product is separated by filtration, and the reacted substance is repeatedly washed with toluene, N,N dimethylformamide, methanol, ethanol, and deionized water, and the solid is collected after freeze-drying to obtain Carbon nanotubes chemically modified with manganese tetraaminophthalocyanine.

[0092] 2. A preparation of a positive electrode material for a lithium-sulfur battery, comprising the steps of:

[0093] (3) Weigh 1.5 g of manganese tetra...

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Abstract

The invention belongs to the technical field of lithium-sulfur batteries and especially relates to a carbon composite material chemically modified by a metal phthalocyanine complex, a battery cathodematerial and a preparation method and application thereof. The composite material comprises a carbon material and a metal phthalocyanine complex attached to the carbon material, and the metal phthalocyanine complex has substituents on the periphery. The cathode material comprises a carbon composite material chemically modified by the metal phthalocyanine complex and a sulfur element loaded on thecomposite material. The metal phthalocyanine complex and the carbon material are combined in a chemical bonding mode, and the obtained material is used as the cathode material of a lithium-sulfur battery after sulfur loading, so that the sulfur utilization rate and the charge-discharge coulombic efficiency can be effectively improved, the specific capacity of the lithium-sulfur battery is remarkably improved, and the cycle life of the lithium-sulfur battery is remarkably prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries. In particular, it relates to a carbon composite material chemically modified by a metal phthalocyanine complex, a positive electrode material for a battery, and a preparation method and application thereof. Background technique [0002] The information disclosed in the Background of the Invention is only intended to increase the understanding of the general background of the invention, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art. [0003] With the rapid development of demand in fields such as electric vehicles, smart grids, and electronic products, it is imminent to develop new energy storage devices and systems with high capacity, environmental friendliness, long cycle life, and low cost. Lithium-sulfur battery is a new system secondary battery....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J21/18B01J35/00H01M4/62H01M10/0525
CPCB01J21/185B01J31/1616B01J31/1825B01J35/0033B01J2531/025B01J2531/16B01J2531/56B01J2531/57B01J2531/64B01J2531/72B01J2531/842B01J2531/847H01M4/625H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 胡成陈传忠杨晓霞
Owner SHANDONG UNIV
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