Preparation method of spherical lithium-sulfur battery cathode material, and product

Abstract

The invention discloses a preparation method of a spherical lithium-sulfur battery cathode material, and further discloses the spherical lithium-sulfur battery cathode material prepared through the method. The preparation method comprises the steps: a sulfur precursor, a carbon source, an adhesive and a polar adsorption additive are dispersed into water, after even stirring, spray drying is conducted, and the monodisperse spherical cathode material is prepared. The spherical lithium-sulfur battery cathode material is constituted by sulfur, a carbon carrier, a polymeric additive and the polar adsorption additive; and the spherical lithium-sulfur battery cathode material is presented to be a spherical particle or a monodisperse spherical particle under a scanning electron microscope, whereinthe spherical particle is evenly distributed with the sulfur and formed by carbon nano tubes which are mutually staggered and entangled, and the monodisperse spherical particle is evenly distributedwith the sulfur and formed by graphene sheets which are mutually staggered and entangled. The preparation method is simple, the lithium-sulfur battery cathode material can be quickly prepared, the prepared spherical lithium-sulfur battery cathode material has the high adsorption capacity and electrical conductivity, and monodispersity, and can be effectively loaded with the sulfur, and a formed conductive network is practically available.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a spherical lithium-sulfur battery and the positive electrode material of a spherical lithium-sulfur battery prepared by the method. Background technique [0002] The theoretical energy density of lithium-sulfur batteries is as high as 2600Wh kg -1 , and the positive electrode active material elemental sulfur is cheap, non-toxic and harmless. Based on the above advantages, lithium-sulfur batteries have attracted the attention of many researchers, and are expected to replace conventional lithium-ion batteries at this stage and become high-energy-density, long-life secondary batteries in the future. . [0003] The development of lithium-sulfur battery technology faces many challenges. One of the main problems is that the utilization rate of active material sulfur in the charge and discharge process is very low due to the insulating properties of elemental sulfur, which is ...

AI Technical Summary

Problems solved by technology

In the preparation of carbon-sulfur composite materials, the hot-melt sulfur-soaking method and the high-temperature sulfur steam sulfur-carrying method, etc., inevitably have the problem of material agglomeration, and the essence of agglomeration is that carbon and sulfur form a "sulfur-coated carbon" type structure, which not only makes the carbon conductive network unable to function, but also brings many problems to the later electrode preparation.

Images