Li2S capacity utilization and cycle life, related results were published in Advanced Energy Materials magazine.
With the development of society and science and technology, human demand for electrochemical energy storage technology is increasing. The emerging energy storage system-lithium-sulfur batteries has the advantages of high theoretical capacity, low cost, and environmental friendliness, which has attracted the attention of domestic and foreign researchers. . The research and development of high-capacity lithium-sulfur battery cathode materials is essential to promote the development of new energy electric vehicles, portable electronic devices and other fields.
The theoretical capacity of lithium sulfide (Li2S) material is as high as 1166 mA h g-1, which is several times that of other transition metal oxides and phosphates; the volume shrinkage that occurs during the first delithiation charging process can provide for the subsequent lithium insertion discharge reaction The space protects the electrode structure from damage; it can be assembled with non-lithium metal anode materials (such as silicon, tin, etc.) to effectively avoid safety hazards caused by problems such as the formation of lithium dendrites. It is a lithium with great development potential. Sulfur battery cathode material. However, the material has low electronic/ionic conductivity, and the dissolution of the reaction intermediate polysulfide in the electrolyte causes problems such as the shuttle effect, which limits its practical application in lithium-sulfur batteries.
