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Preparation method for positive electrode material of lithium sulfur battery

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of small output and complex preparation methods, and achieve improved conductivity, not easy to agglomerate, and excellent cycle stability. Effect

Inactive Publication Date: 2019-03-12
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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Problems solved by technology

However, there are still many technical problems in the process of industrial development, such as small output and complex preparation methods. In order to improve the storage capacity and safety of the battery, researchers have developed more efficient nanocomposites as the positive electrode of the battery.

Method used

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  • Preparation method for positive electrode material of lithium sulfur battery
  • Preparation method for positive electrode material of lithium sulfur battery

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Embodiment 2

[0034] Step 1: Preparation of ZIF-67@GO / CNTS composite:

[0035] 1455mg of Co(NO 3 ) 2 ·6H 2 O was added to the methanol solution of 125ml and stirred for 10min; the 2-methylimidazole of 1640mg was added to the methanol solution of 125ml and stirred for 10min, and the solution mixed with 2-methylimidazole was slowly poured into the still stirring Co ( NO 3 ) 2 ·6H 2O solution, stirred for 30min and then stood still. After 24 h the solution was centrifuged and dried. Graphene and carbon nanotubes were formulated into a mixed solution with a mass ratio of 1:1. The prepared ZIF-67 was added to the mixed solution with graphene and carbon nanotubes, and the ZIF-67@GO / CNTS composite was prepared by spray drying.

[0036] Step 2: Carbonization of ZIF-67@GO / CNTS composite:

[0037] The ZIF-67@GO / CNTS composite material prepared in the first step was placed in a porcelain boat, and then the porcelain boat was placed in a tube furnace, and the sample was heated at 350°C for 2h ...

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Abstract

The invention relates to a preparation method for a positive electrode material of a lithium sulfur battery. Specifically, firstly a ZIF-67 nanomaterial is prepared; then a ZIF-67@GO / CNTS composite material is prepared from the ZIF-67 nanomaterial and a GO / CNTS mixed solution through a spray drying technology; and the composite material is carbonized and doped with sulfur to serve as the positiveelectrode material of the lithium sulfur battery. ZIF-67 is simple in preparation process, relatively high in yield and good in product morphology; a synergistic effect of graphene and a carbon nanotube can be improved through spray drying; the conductivity of a sample is improved; and formed balls are not easy to agglomerate. The spray-dried ZIF-67@GO / CNTS is carbonized, so that a porous structure can more easily carry sulfur, the capacity of the lithium sulfur battery is expanded, and the cycling stability of the lithium sulfur battery is enhanced.

Description

technical field [0001] The technical solution of the present invention relates to an electrode made of an active material, to be precise, a method for preparing a positive electrode material of a lithium-sulfur battery. Background technique [0002] With the development of science and technology, portable electronic products, electric vehicles, and aerospace and military industries all look forward to battery systems with higher energy density and longer working life. However, the traditional lithium-ion battery is limited by its theoretical capacity (300mAh / g), which cannot meet the requirements of electric vehicles or hybrid vehicles for long-distance transportation. As an electrochemical energy storage system, lithium-sulfur batteries have the advantages of high specific energy, no memory effect, and good cycle stability. With the development and utilization of new clean energy, especially the development of electric vehicles, higher requirements are placed on the energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/625H01M10/052Y02E60/10
Inventor 王新侯泽凡
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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