Manufacturing method of high-energy long-life lithium-sulfur battery

Abstract

The invention relates to a manufacturing technology of a lithium-sulfur battery, and aims to provide a manufacturing method of a high-energy long-life lithium-sulfur battery. The preparation method comprises the following steps: introducing a sodium chloride solution into a gelatin solution, uniformly stirring the solutions and carrying out flash freezing; carrying out vacuum drying, then carryingout constant-temperature carbonization, crushing, washing, centrifuging and drying to obtain high-conductivity porous carbon; preparing a pyrrole cyclodextrin inclusion compound from a pyrrole solution and beta-cyclodextrin; dropwise adding a hydrogen peroxide ethylene glycol solution, carrying out ultrasonic dispersion to polymerize pyrrole, and carrying out heating evaporation to obtain a conductive adhesive; and preparing the lithium-sulfur battery from the high-conductivity porous carbon and the conductive adhesive. The lithium-sulfur battery disclosed by the invention has the characteristics of high sulfur loading capacity, high electrode conductivity and high electrode structure stability; and the method is simple in process, easy for mechanical production and high in yield. The process route is not only suitable for manufacturing large-capacity electric vehicle power batteries, but also suitable for manufacturing small-capacity mobile phone batteries.

Description

technical field [0001] The invention relates to a high-energy and long-life lithium-sulfur battery and a manufacturing method thereof, in particular to a high-capacity sulfur positive electrode with nickel foam as a carrier, porous carbon with high conductivity as a conductive agent, and a conductive binder, and a negative electrode bent A lithium-sulfur battery manufacturing method formed by positive electrode inserts. 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 electro...

AI Technical Summary

Problems solved by technology

[0007] There are three main problems in lithium-sulfur batteries: (1) lithium polysulfide 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 above-mentioned problems of low-sulfur-loaded electrodes can be basically solved by using suitable separators, binders, and sulfur-loaded materials, but the energy density of low-sulfur-loaded electrodes is too low to reflect the superiority of lithium-sulfur batteries, and it is difficult to improve the energy density of batteries. Beyond existing lithium-ion batteries

Increasing the sulfur loading of sulfur electrodes can effectively increase the energy density of lithium-sulfur batteries, but high sulfur loading leads to poorer electrode conductivity and greater electrode volume changes, so that existing methods cannot solve the conductivity of high sulfur loading electrodes. and the volume expansion problem

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