A predoping material is used for an alkali metal ion electric storage device and is represented by Formula (1):
RSM)n  (1)
where M represents lithium or sodium; n represents an integer of 2 to 6; and R represents an aliphatic hydrocarbon, optionally substituted aromatic hydrocarbon, or optionally substituted heterocycle having 1 to 10 carbon atoms).

In an aspect, a negative electrode for a lithium secondary battery and a method of manufacturing the same is provided. The negative electrode for the lithium secondary battery includes a negative active material layer.

In an aspect, a negative electrode for a lithium secondary battery and a method of manufacturing the same is provided. The negative electrode for the lithium secondary battery includes a negative active material layer.

Disclosed are a cathode for metal-sulfur batteries which includes a cathode active material layer, which contains nitrogen-doped carbon, and a protective layer and a method of manufacturing the same. The cathode for lithium-sulfur batteries according to the present invention includes a cathode active material layer including a sulfur-containing material, a binder, and a nitrogen-doped carbon material; and a protective layer that is disposed on the cathode active material layer and is composed of a nitrogen-doped carbon material, wherein the nitrogen-doped carbon material of the cathode active material layer has a form wherein spherical particles and linear structures are mixed and the nitrogen-doped carbon material of the protective layer has a linear structure.

Methods of making an electrolyte for a solid-state battery can include dissolving a lithiated perfluorosulfonic acid in a solvent to form a mixture, stirring the mixture using shear mixing, and heating the mixture to form an electrolyte gel. Methods of making a cathode electrode for a solid-state battery include forming an electrode composition including active materials, stirring the mixture using sheer mixing to reduce particle size and to form an ink, coating the ink on aluminum foil using one of doctor blade, micro gravure, and slot-die, and drying. The electrolyte is applied as an overlayer on the electrode.

A method for manufacturing composites in which the nanosize of a carbon material and a metal compound can be maintained as the final product is realized to provide a superior electrode material. A treatment of increasing the functional groups possessed by a carbon material is performed in advance. Then, a metal compound precursor is supported on a carbon material by separately performing a treatment of adsorbing one of source materials of the metal compound to the functional groups of the carbon material having increased functional groups and a treatment of reacting the adsorbed source material of the metal compound with the rest of the source materials on the carbon material to produce a metal compound precursor on the carbon material. Finally, a lithium source is introduced and calcined.

A method for manufacturing composites in which the nanosize of a carbon material and a metal compound can be maintained as the final product is realized to provide a superior electrode material. A treatment of increasing the functional groups possessed by a carbon material is performed in advance. Then, a metal compound precursor is supported on a carbon material by separately performing a treatment of adsorbing one of source materials of the metal compound to the functional groups of the carbon material having increased functional groups and a treatment of reacting the adsorbed source material of the metal compound with the rest of the source materials on the carbon material to produce a metal compound precursor on the carbon material. Finally, a lithium source is introduced and calcined.

A lithium ion battery having a cathode and an anode, the cathode includes a material having an olivine or spinel structure, the anode includes a coating of a composite lithium powder coated with a complex lithium salt, such as LiPF.sub.6, LiBF.sub.4, LiClO.sub.4, LiAsF.sub.6, LiF.sub.3SO.sub.3, and mixtures thereof. A separator is disposed between the anode and the cathode, and a non-aqueous electrolyte solution in contact with the cathode, the anode, and the separator. The anode can include a carbon material. A layer of a composite lithium powder coated with a complex lithium salt can be disposed between the anode and the separator.

A lithium ion battery having a cathode and an anode, the cathode includes a material having an olivine or spinel structure, the anode includes a coating of a composite lithium powder coated with a complex lithium salt, such as LiPF.sub.6, LiBF.sub.4, LiClO.sub.4, LiAsF.sub.6, LiF.sub.3SO.sub.3, and mixtures thereof. A separator is disposed between the anode and the cathode, and a non-aqueous electrolyte solution in contact with the cathode, the anode, and the separator. The anode can include a carbon material. A layer of a composite lithium powder coated with a complex lithium salt can be disposed between the anode and the separator.

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.