Abstract: An electrolyte for a rechargeable lithium battery and a rechargeable lithium battery including the electrolyte, the electrolyte including a non-aqueous organic solvent; a lithium salt; and an additive, wherein the additive includes a compound represented by Chemical Formula 1: in Chemical Formula 1, R1 is a cyano group, a substituted or unsubstituted C2 to C10 alkenyl group, or a substituted or unsubstituted C2 to C10 alkynyl group.

Abstract: An actuator comprising a flexible substrate having a surface comprising one or more active regions, each of the active regions having disposed thereon an electrochemically active film comprising a plurality of 1T phase 2D MoS2 nanosheets which impart a first force upon the flexible substrate in response to electrochemical charging of ions in the 2D MoS2 nanosheets and impart a second force upon the flexible substrate in response to electrochemical discharging of ions in the 2D MoS2 nanosheets, wherein the first and second forces imparted to the flexible substrate each being sufficient to displace the flexible substrate. The flexible substrate may comprise a polymer substrate and the electrochemically active film may comprise a conductive layer having disposed thereon the plurality of 1T phase 2D MoS2 nanosheets.

Abstract: A battery pack includes a casing, a plurality of battery cells, and a first connector, for example. The casing includes a first outer wall and a protrusion that is provided on the first outer wall and protrudes outward from the first outer wall. The battery cells include an electrode terminal and are housed in the casing. The first connector is provided on the protrusion and is electrically connected to the electrode terminal.

Abstract: A compound of Formula 1: Li6+(4?a)x+c)M4+(2?x)Aa+xO(7?c)N?c??(1) wherein M is a tetravalent cationic element, A is a divalent or trivalent cationic element, N? is an anion having a valence of less than ?2, wherein when A is Y3+, In3+, Zn2+, or a combination thereof, 0.15<x?0.5, otherwise 0?x?0.5, 0?c?2, and ((4?a)x+c)>0.

Abstract: The present invention is a negative electrode active material for a negative electrode active material layer of a lithium ion secondary battery, wherein: the negative electrode active material comprises silicon-based material consisting of SiOx (0.5?x?1.6); and the negative electrode active material has two or more peaks in a region of a bond energy ranging from 520 eV to 537 eV in an O 1s peak shape given in an X-ray photoelectron spectroscopy. As a result, it is possible to provide a negative electrode active material in which a battery capacity can be increased and cycle characteristics and initial charge/discharge characteristics can be improved when used as a negative electrode active material for a lithium ion secondary battery.

Abstract: A nonaqueous electrolyte secondary battery includes: a wound electrode body that is formed by laminating an elongated sheet-shaped positive electrode current collector foil, an elongated sheet-shaped negative electrode current collector foil, and an elongated sheet-shaped separator to obtain a laminate and winding the obtained laminate; a nonaqueous electrolytic solution; and a case that accommodates the wound electrode body and the nonaqueous electrolytic solution. A solid electrolyte interface film derived from an oxalato borate complex is formed on at least a surface of the negative electrode active material layer.

Abstract: A fuel cell stack includes a plurality of cells that are stacked in a stacking direction. Each cell includes a power generating body and a pair of separators. The separators respectively are arranged on opposite surfaces of the power generating body in the stacking direction. Each separator includes a first surface and a second surface. A titanium nitride layer is formed on the first surface, and a conductive carbon layer is formed on the titanium nitride layer. A titanium nitride layer is formed on the second surface. Each separator is in contact with the power generating body via the titanium nitride layer and the carbon layer on the first surface and is in contact with one of the separators of an adjacent cell via the titanium nitride layer on the second surface.