Method for manufacturing lithium-sulfur battery

Abstract

The invention relates to a battery preparation technology, and aims to provide a method for manufacturing a lithium-sulfur battery. The method comprises the following steps of: grinding a carbon-coated aluminum composite material, acetylene black and polyvinylidene fluoride (PVDF), adding N-methyl pyrrolidone, and regulating to be sticky; mechanically mixing into paste, coating the paste on a penetration hole copper film, and drying in the shade; performing compression molding to obtain a negative electrode of the lithium-sulfur battery; grinding a carbon-coated sulfur composite material, the acetylene black and the PVDF, adding the N-methyl pyrrolidone to form the paste, coating the paste on an aluminum film, and drying in the shade; performing compression molding to obtain a positive electrode of the lithium-sulfur battery; forming a sandwich structure through electrode materials facing the side of the positive electrode and the negative electrode and a partition film which adopts a micro-pore polypropylene film, wherein a lithium film is arranged on one side, abutting against the partition film, of a copper film of the negative electrode,; and dissolving an electrolyte LiClO4 into a mixed solvent of dioxolame and ethylene glycol monomethyl ether. According to the method, a steady charge-discharge voltage platform is adopted; the lithium-sulfur battery is high in electrode reaction reversibility, high in chemical stability and thermal stability, low in cost, easy to prepare, pollution-free, and anti-oxidant; and the safety is improved.

Description

technical field [0001] The invention relates to a manufacturing method of a lithium-sulfur battery, in particular to coating an aluminum film on a positive base with carbon-coated sulfur as a positive electrode material, and coating a perforated copper film on a negative base with carbon-coated aluminum as a negative material; Manufacturing method of lithium-sulfur battery rolled together with separator. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. In 1990, Nagoura and others in Japan developed a negative electrode with petroleu...

AI Technical Summary

Problems solved by technology

There are three main problems in lithium-sulfur batteries: (1) Li-polysulfur compounds dissolve in the electrolyte; (2) Sulfur, as a non-conductive substance, has very poor conductivity, which is not conducive to the high rate performance of the battery; (3) Sulfur in During the charge and discharge process, the volume change is very large, resulting in poor mechanical stability of the electrode

At present, the main problem faced by metal aluminum anode materials is: during the charge-discharge cycle, the reversible formation and decomposition of Li-Al alloy is accompanied by a larger volume change compared with Li-Sn alloy, which makes the alloy more prone to cracks And pulverization, the contact resistance increases, the irreversible capacity loss is formed, and even the reversible lithium storage effect is lost, which finally leads to electrode failure. Therefore, the cycle performance of lithium-ion batteries purely using aluminum as the negative electrode material is very poor.

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