Abstract: A non-aqueous electrolyte secondary battery is provided that has a high discharge capacity and in which the structure is stable even when lithium is extracted to a high potential so that good cycle performance can be obtained. A non-aqueous electrolyte secondary battery has a negative electrode, a non-aqueous electrolyte, and a positive electrode having a positive electrode active material comprising sodium oxide, characterized in that: the sodium oxide contains lithium; and the molar amount of the lithium is less than the molar amount of the sodium.

Abstract: A mixed positive electrode active material is used. The mixed positive electrode active material is obtained by mixing a layered oxide whose initial charge-discharge efficiency when lithium metal is used for a counter electrode is less than 100% (hereinafter referred to as a first layered oxide) and a layered oxide whose initial charge-discharge efficiency is 100% or more (hereinafter referred to as a second layered oxide). Examples of the first layered oxide include Li1+aMnxCoyNizO2. A sodium oxide such as LiANaBMnXCoYNiZO2 other than a layered compound from which lithium is previously extracted by acid treatment or the like can be used as the second layered oxide whose initial charge-discharge efficiency is 100% or more. A layered oxide obtained by replacing (ion exchange) sodium in the foregoing LiANaBMnXCoYNiZO2 with lithium can be also used as the second layered oxide.

Abstract: An object of the invention is to provide an inexpensive non-aqueous electrolyte secondary battery that allows reversible charge and discharge to be carried out and can be used for a long period because of a stable non-aqueous electrolyte used therein. The invention provides a non-aqueous electrolyte secondary battery including a positive electrode including a positive electrode active material and capable of storing and releasing sodium, a negative electrode capable of storing and releasing sodium, and a non-aqueous electrolyte, and the positive electrode active material includes sodium, nickel, manganese, and a transition metal that can exist in a hexavalent state. An example of the transition metal that can exist in a hexavalent state may include tungsten (W). An example of the negative electrode may include a sodium metal capable of storing and releasing sodium ions.

Abstract: A non-aqueous electrolyte secondary cell is provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte solution, wherein said positive electrode comprises sulfur and said non-aqueous electrolyte solution comprises a room-temperature molten salt having a melting point of 60° C. or less.

Abstract: Li2-xAxMO3 obtained by replacing lithium in Li2MO3 having a layered structure by an alkali metal having ion radius larger than that of lithium is used as a positive electrode active material. In this Li2-xAxMO3, x satisfies the relation 0<x?O.5, the above-mentioned A indicates the alkali metal having the ion radius larger than that of lithium (Li) (for example, sodium (Na) or potassium (K)) and M indicates a transition metal that can be tetravalent. Examples of the transition metal that can be tetravalent indicated by the above-mentioned M include manganese (Mn), molybdenum (Mo), titanium (Ti), platinum (Pt), iridium (Ir), ruthenium (Ru) and the like.

Abstract: A non-aqueous electrolyte secondary battery includes a positive electrode having a positive electrode mixture, a negative electrode, and a non-aqueous electrolyte. The positive electrode mixture contains as a positive electrode active material Li1+x(MnyNizCo1?y?z)1?xO2, where 0<x<0.4, 0<y?1, and 0?z?1. The positive electrode mixture has a filling density of from 2.2 g/cm3 to 3.6 g/cm3, and a film thickness of less than 50 ?m.

Abstract: In a non-aqueous electrolyte secondary cell including a positive electrode, a negative electrode and a non-aqueous electrolyte, the negative electrode includes a material capable of absorbing or releasing lithium and wherein the non-aqueous electrolyte contains a room-temperature molten salt having a melting point of 60° C. or less and a lithium salt.

Abstract: Li2-xAxMO3 obtained by replacing lithium in Li2MO3 having a layered structure by an alkali metal having ion radius larger than that of lithium is used as a positive electrode active material. In this Li2-xAxMO3, x satisfies the relation 0<x?O.5, the above-mentioned A indicates the alkali metal having the ion radius larger than that of lithium (Li) (for example, sodium (Na) or potassium (K)) and M indicates a transition metal that can be tetravalent. Examples of the transition metal that can be tetravalent indicated by the above-mentioned M include manganese (Mn), molybdenum (Mo), titanium (Ti), platinum (Pt), iridium (Ir), ruthenium (Ru) and the like.

Abstract: A positive electrode active material including lithium (Li), nickel (Ni), manganese (Mn) and a transition metal that can be in the hexavalent state is used. As the transition metal that can be in the hexavalent state, for example, one or both of tungsten (W) and molybdenum (Mo) can be used. As the positive electrode active material including a plurality of materials as mentioned above, LiNi0.5Mn0.5O2 can be used. As a negative electrode, a carbon material or a silicon material capable of storing and releasing lithium ions can be used.

Abstract: A nonaqueous electrolytic secondary battery capable of improving the operating cycle characteristic is provided.

Abstract: A positive electrode has a positive-electrode active material obtained from a mixture of elemental sulfur, a conductive agent and a binder. A negative electrode is composed of a carbon material such as graphite, lithium alloy, or the like that can store lithium and release it. A nonaqueous electrolyte contains a first solvent composed of at least one compound selected from the group consisting of cyclic ethers and chain ethers, and a second solvent composed of a room temperature molten salt having a melting point not higher than 60° C. in a volume ratio in the range of 0.1:99.9 to 40:60, and also contains saturated lithium polysulfide.

Abstract: A non aqueous electrolyte secondary battery comprises a positive electrode made from a material which is capable of occluding and discharging anions, a negative electrode made from a material which is capable of occluding and discharging cations, and a non aqueous electrolyte containing a room temperature molten salt having a melting point of not greater than 60° C.

Abstract: A non-aqueous electrolyte secondary cell is provided with a positive electrode, a negative electrode, and a non-aqueous electrolyte solution, wherein said positive electrode comprises sulfur and said non-aqueous electrolyte solution comprises a room-temperature molten salt having a melting point of 60° C. or less.

Abstract: An electrolyte for a nonaqueous battery according to the present invention consists essentially of magnesium bistrifluoromethanesulfonimide. An electrolytic solution for a nonaqueous battery according to the present invention includes the magnesium bistrifluoromethanesulfonimide, and an organic solvent such as a cyclic carbonate, a chain carbonate, a cyclic ether and a chain ether or an ordinary temperature molten salt having a melting point of 60° C. or less in which the magnesium bistrifluoromethanesulfonimide is dissolved.

Abstract: A secondary battery is characterized by using an organic material including carbon having a conjugate electron cloud and coupled with an electron attractive group; or a material obtained by baking a fluorocarbon polymer or graphite fluoride in an inert atmosphere at a temperature in the range of from the decomposition start temperature to 1000° C., as a positive electrode active material for the secondary battery.

Abstract: A non aqueous electrolyte secondary battery comprises a positive electrode made from a material which is capable of occluding and discharging anions, a negative electrode made from a material which is capable of occluding and discharging cations, and a non aqueous electrolyte containing a room temperature molten salt having a melting point of not greater than 60° C.

Abstract: A secondary battery is characterized by using an organic material including carbon having a conjugate electron cloud and coupled with an electron attractive group; or a material obtained by baking a fluorocarbon polymer or graphite fluoride in an inert atmosphere at a temperature in the range of from the decomposition start temperature to 1000° C., as a positive electrode active material for the secondary battery.