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A kind of manufacturing method of positive electrode of lithium-sulfur battery

A production method and lithium-sulfur battery technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of high volatility environment, harmfulness to operators, cumbersome production process, etc., achieve large reaction active surface, reduce impedance and extremely degree of effect

Active Publication Date: 2015-08-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method increases the micropore volume inside the electrode to a certain extent, the production process is cumbersome, and a variety of highly volatile organic solvents that are harmful to the environment and operators need to be introduced in the process, which has its own disadvantages

Method used

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  • A kind of manufacturing method of positive electrode of lithium-sulfur battery
  • A kind of manufacturing method of positive electrode of lithium-sulfur battery

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Embodiment

[0038] The carbon material used as the matrix is ​​mesoporous carbon prepared by SBA15 template method and KB600 carbon powder in a mass ratio of 2:1 to 1:2, and the binder is polyvinylidene fluoride with a molecular weight of 900,000 to 1 million. between.

[0039] Example scheme

[0040] The mass ratio percentage of each material ratio of the positive electrode of the embodiment of table 1

[0041]

[0042] The above table is the mass proportion of various substances in the specific examples.

[0043] Specific method: (1) Weigh the matrix carbon material and sulfur powder according to the specific gravity in the table, ball mill for more than 4 hours, weigh PVDF powder according to the specific gravity and add it to the carbon-sulfur mixture, ball mill again for more than 2 hours, and add the dispersant N-methyl Pyrrolidone NMP, so that the solid content in the slurry is 30%, and after mixing evenly, ball milling for more than 4 hours to obtain the slurry; (2) The slurr...

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Abstract

The invention relates to a manufacturing method of a lithium-sulfur battery anode. The manufacturing method comprises the following steps of blending elemental sulfur and a carbon material to obtain a sulfur-carbon mixture, blending the sulfur-carbon mixture and a binder, adding a dispersant into the mixture, carrying out stirring or ball milling for 1-10h to obtain slurry or paste, coating, pressing, spraying or sputtering the slurry or paste on a current collector, carrying out drying to obtain an electrode slice, heating the dried electrode slice in vacuum to a temperature of 50-80 DEG C, feeding protective gas N2 or Ar so that the system is at one bar pressure, carrying out heating to a temperature of 100-200 DEG C, and carrying out keeping for 1-10h. The manufacturing method solves the problems of the structure of the anode obtained by the prior art. Through the manufacturing method, the lithium-sulfur battery anode provides an enough space for intermediate dissolution and ion and electron transmission, provides a wide active surface for an oxidation reduction reaction, reduces reaction process polarization and improves energy and cycle performances.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to a method for manufacturing a positive electrode of a lithium-sulfur battery. Background technique [0002] With the development of electronic technology, the functions of portable products are becoming more and more powerful, and the requirements for secondary power supply equipment are also getting higher and higher. At present, portable products represented by mobile phones, computers, electric tools, etc., mostly use lithium-ion batteries as power sources. However, the mass-specific energy density and volume-specific energy density of lithium-ion batteries are 100-160Wh / Kg and 80-150Wh / L, respectively, which are far from meeting the power requirements of these products, and the high frequency of charging leads to a sharp decrease in service life. , so secondary chemical power sources with high energy density have become a research hotspot in recent years. Lithium-sulfu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397H01M4/04
CPCH01M4/1391H01M4/364H01M4/62H01M4/622Y02E60/10
Inventor 张华民王倩张益宁曲超王美日李婧
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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