A kind of lithium-sulfur battery positive electrode material and its preparation method and lithium-sulfur battery

Abstract

A positive electrode material for a lithium sulphur battery and a preparation method thereof, and the lithium sulphur battery are disclosed. The positive electrode material comprises activated carbon,carbon black, transition metal or a transition metal compound, and sublimed sulfur; and the transition metal compound is metal carbide, metal boride, metal nitride, metal phosphide, metal oxide or metal sulfide. The activated carbon is utilized as a main body of sulfur carrying; the carbon black can carry sulfur and can also strengthen the conductivity of the positive electrode material; and thetransition metal or the transition metal compound can play a fixation role in lithium polysulfide produced in an electrochemical reaction, inhibits the shuttle effect of polysulfide ions, and enablesthe cycle performance of the lithium sulphur battery to be improved. The positive electrode material for the lithium sulphur battery disclosed by the invention has the advantages of being simple and easy to obtain, easy to be prepared on a large scale, and the like, and the lithium sulphur battery with long circulation, high specific capacity and high specific energy can be obtained.

Description

technical field

[0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material, a preparation method thereof, and a lithium-sulfur battery. Background technique

[0002] A lithium-sulfur battery consists of a positive electrode containing electroactive sulfur, a negative electrode containing lithium, an electrolyte, and a separator. The theoretical specific energy of lithium-sulfur batteries is as high as 2600 Wh / kg, and the actual specific energy is higher than that of current commercial lithium-ion batteries. This significant advantage in specific energy makes lithium-sulfur batteries have a wide range of potential applications in special power sources, electric vehicles, and high-altitude aircraft.

[0003] The cathode material of lithium-sulfur batteries is the key technology of lithium-sulfur batteries. Generally speaking, sulfur needs to be compounded with porous carbon to improv...

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