Abstract: Provided is a sulfur-carbon composite comprising a highly graphitic carbon material and sulfur, wherein the carbon material has a high graphitization degree characterized by a ratio of the intensity of G band to the intensity of D band in Raman spectrum being more than 1.0, the material is either a graphitic microporous carbon substrate, or a core-shell material with a conductive core coated by a graphitic microporous carbon layer, and wherein sulfur is encapsulated into the porous structure of the carbon material. Also provided are an electrode and a lithium-sulfur battery comprising the sulfur-carbon composite, and a process for preparing the sulfur-carbon composite.

Abstract: An electrode additive comprising an electrochemically active material in a form of one-dimensional molecular chain is disclosed wherein the electrochemically active material is contained inside a nanotube-formed conductive shell material. An electrode comprising said electrode additive, and the uses of said electrode additive and said electrode are also disclosed.

Abstract: A sulfur-carbon composite includes micro-porous carbon nanosheets and sulfur. The sulfur is loaded into the micropores of the micro-porous carbon nanosheets. The sulfur-carbon composite can be included in an electrode material. The sulfur-carbon composite can be included in a lithium-sulfur battery. A process for preparing the sulfur-carbon composite includes carbonization-activation of carbonaceous precursor, purification, and loading of sulfur into micro-porous carbon nanosheets.

Abstract: The present invention relates to a sulfur-containing composite with a core-shell structure for lithium-sulfur battery, wherein the substrate of the core contains macropores and/or mesopores and optionally micropores, and the substrate of the shell is a microporous coating layer; as well as a process for preparing said sulfur-containing composite, an electrode material and a lithium-sulfur battery comprising said sulfur-containing composite.

Abstract: An immobilized selenium body, made from carbon and selenium and optionally sulfur, makes selenium more stable, requiring a higher temperature or an increase in kinetic energy for selenium to escape from the immobilized selenium body and enter a gas system, as compared to selenium alone. Immobilized selenium localized in a carbon skeleton can be utilized in a rechargeable battery. Immobilization of the selenium can impart compression stress on both the carbon skeleton and the selenium. Such compression stress enhances the electrical conductivity in the carbon skeleton and among the selenium particles and creates an interface for electrons to be delivered and or harvested in use of the battery. A rechargeable battery made from immobilized selenium can be charged or discharged at a faster rate over conventional batteries and can demonstrate excellent cycling stability.

Abstract: Disclosed is method of preparing a selenium carbon composite material and a use of the selenium carbon composite material in a cathode of a lithium selenium secondary battery. A battery formed with a cathode of the disclosed selenium carbon composite material has high energy density and stable electrochemical performance. The disclosed selenium carbon composite material can effectively shorten the migration distance of lithium ions during charging and discharging of the battery and improve conductivity and utilization of selenium after compounding carbon and selenium. Multiple batteries formed with cathodes of the disclosed selenium carbon composite material can be assembled into a lithium selenium pouch-cell battery having stable electrochemical performance and high energy density.

Abstract: The present invention relates to a sulfur-containing composite with a core-shell structure for lithium-sulfur battery, wherein the substrate of the core contains macropores and/or mesopores and optionally micropores, and the substrate of the shell is a microporous coating layer; as well as a process for preparing said sulfur-containing composite, an electrode material and a lithium-sulfur battery comprising said sulfur-containing composite.