The present specification provides an electrolyte including a phthalate phosphine-type anion, an additive for a secondary battery including the electrolyte, and a secondary battery including the additive.

According to one embodiment, a battery module includes a battery unit. The battery unit includes a nonaqueous lithium ion battery including a nonaqueous electrolyte, and an aqueous lithium ion battery including an electrolytic solution in which an electrolyte is dissolved in an aqueous solvent. In the battery unit, the aqueous lithium ion battery is connected in parallel to the nonaqueous lithium ion battery.

According to one embodiment, a battery module includes a battery unit. The battery unit includes a nonaqueous lithium ion battery including a nonaqueous electrolyte, and an aqueous lithium ion battery including an electrolytic solution in which an electrolyte is dissolved in an aqueous solvent. In the battery unit, the aqueous lithium ion battery is connected in parallel to the nonaqueous lithium ion battery.

Disclosed are a negative electrode active material including lithium titanium oxide particles, wherein the lithium titanium oxide particles have an average particle diameter (D.sub.50) of 0.5-9 m, a specific surface area of 3-7 m.sup.2/g, and a pellet density of 1.7 g/cc or more under a pressure of 64 MPa, and a lithium secondary battery including the same.

Provided is a method for producing an electrode body for an all-solid-state battery whereby cracks in the solid electrolyte layer can be suppressed even when the electrode body is pressed at a higher pressure, along with an electrode body produced by this method. The method for producing an electrode body for an all-solid-state battery disclosed herein is a method for manufacturing an electrode body for an all-solid-state battery including a solid electrolyte layer and a first active material layer bonded to a first surface of the solid electrolyte layer, including a step of superimposing the solid electrolyte layer and the first active material layer when there is a difference between the area of the solid electrolyte layer and the area of the first active material layer at the bonding surface between the solid electrolyte layer and the first active material layer, a step of providing an insulating layer in a region where it contacts the edges of the smaller of the solid electrolyte layer and the first active material layer and fills in the difference between the layers, a step of pressing the solid electrolyte layer, the first active material layer and the insulating layer in the lamination direction of the solid electrolyte layer and the first active material layer.

Provided is a method for producing an electrode body for an all-solid-state battery whereby cracks in the solid electrolyte layer can be suppressed even when the electrode body is pressed at a higher pressure, along with an electrode body produced by this method. The method for producing an electrode body for an all-solid-state battery disclosed herein is a method for manufacturing an electrode body for an all-solid-state battery including a solid electrolyte layer and a first active material layer bonded to a first surface of the solid electrolyte layer, including a step of superimposing the solid electrolyte layer and the first active material layer when there is a difference between the area of the solid electrolyte layer and the area of the first active material layer at the bonding surface between the solid electrolyte layer and the first active material layer, a step of providing an insulating layer in a region where it contacts the edges of the smaller of the solid electrolyte layer and the first active material layer and fills in the difference between the layers, a step of pressing the solid electrolyte layer, the first active material layer and the insulating layer in the lamination direction of the solid electrolyte layer and the first active material layer.

Embodiments of the claimed invention are directed to a device, comprising: an anode that includes a lithiated silicon-based or lithiated carbon-based material or pure lithium metal or metal oxides and a sandwich-type sulfur-based cathode, wherein the anode and the cathode are designed to have porous structures. An additional embodiment of the invention is directed to a scalable method of manufacturing sandwich-type LiS batteries at a significantly reduced cost compared to traditional methods. An additional embodiment is directed to the use of exfolidated CNT sponges for enlarging the percentage of sulfur in the cathode to have large energy density.

The present application relates to an electrolyte, an electrochemical device and an electronic device comprising the same. The electrolyte of the present application includes a cyclic N-containing sulfonyl-compound and at least one of vinylene carbonate, fluoroethylene carbonate, lithium tetrafluoroborate, lithium difluoro(oxalato)borate or lithium difluorophosphate. The electrolyte of the present application may further include a sulfur-oxygen double bond containing compound and a silicon-containing carbonate. Compared with the prior art, using the electrolyte provided by the present application can effectively improve the high-temperature storage, cycle performance and overcharge performance of an electrochemical device, such as a lithium-ion battery.

The present application relates to an electrolyte, an electrochemical device and an electronic device comprising the same. The electrolyte of the present application includes a cyclic N-containing sulfonyl-compound and at least one of vinylene carbonate, fluoroethylene carbonate, lithium tetrafluoroborate, lithium difluoro(oxalato)borate or lithium difluorophosphate. The electrolyte of the present application may further include a sulfur-oxygen double bond containing compound and a silicon-containing carbonate. Compared with the prior art, using the electrolyte provided by the present application can effectively improve the high-temperature storage, cycle performance and overcharge performance of an electrochemical device, such as a lithium-ion battery.

The present invention provides a lithium ion secondary cell excellent in high-temperature storage characteristics and high voltage cycle characteristics; and a nonaqueous electrolyte for the cell. The present invention relates to a lithium ion secondary cell, comprising a positive electrode, a negative electrode, and a nonaqueous electrolyte containing nonaqueous solvents and an electrolyte salt, the nonaqueous solvents comprising a fluorine-containing ether represented by the formula (1):
Rf.sup.1ORf.sup.2(1)
wherein Rf.sup.1 and Rf.sup.2 are the same as or different from each other, each being a C.sub.1-10 alkyl group or a C.sub.1-10 fluoroalkyl group; and at least one of Rf.sup.1 and Rf.sup.2 is a fluoroalkyl group, and the following compounds (I) and (II): (I) a fluorine-containing unsaturated compound; and (II) a hydroxy group-containing compound represented by the formula (2):
Rf.sup.1OH(2)
wherein Rf.sup.1 is the same as above, and the nonaqueous solvents comprising the compounds (I) and (II) in a total amount of 5000 ppm or less for the fluorine-containing ether.