Provides is a cathode active material comprising particles each containing a lithium composite oxide, a coating layer containing an ammonium phosphate compound containing a metal other than lithium. The coating layer coats each of the particles. The metal other than lithium includes at least one selected from the group consisting of manganese, nickel, and cobalt.

Systems and methods are provided for high volume roll-to-roll direct coating of electrodes for silicon-dominant anode cells and may include applying a slurry to a current collector film, the slurry comprising silicon particles and a binder material; drying the slurry to form a precursor composite film; rolling the current collector film into a precursor composite roll; and applying a heat treatment to the precursor composite film and the current collector film in a nitrogen gas environment, wherein the heat treatment is configured for converting the precursor composite film to a pyrolyzed composite film. The heat treatment may include one or both of: applying the heat treatment to a roll comprising the precursor composite roll in whole; and applying the heat treatment to the current collector film as it is continuously fed from the precursor composite roll.

The adhesion between metal foil serving as a current collector and a negative electrode active material is increased to enable long-term reliability. An electrode active material layer (including a negative electrode active material or a positive electrode active material) is formed over a base, a metal film is formed over the electrode active material layer by sputtering, and then the base and the electrode active material layer are separated at the interface therebetween; thus, an electrode is formed. The electrode active material particles in contact with the metal film are bonded by being covered with the metal film formed by the sputtering. The electrode active material is used for at least one of a pair of electrodes (a negative electrode or a positive electrode) in a lithium-ion secondary battery.

In a secondary battery including a large-sized electrode group including stacked positive and negative electrode plates, an electrode plate in which failures such as the separation and cracking of an active material layer and the abrasion and cracking of a current collector are unlikely to occur is provided. An electrode plate 21 includes a coated region CR where active material layers 21a are formed and an uncoated region NC where no active material layer is formed and has a configuration in which a boundary section between the coated region and the uncoated region is provided with a first buffer region C2 having a non-linear irregular shape in plan view.

The present invention provides one with an iron electrode employing a binder comprised of polyvinyl alcohol (PVA) binder. In one embodiment, the invention comprises an iron based electrode comprising a single layer of a conductive substrate coated on at least one side with a coating comprising an iron active material and a binder, wherein the binder is PVA. This iron based electrode is useful in alkaline rechargeable batteries, particularly as a negative electrode in a Ni—Fe battery.

A battery and a method of constructing a battery are disclosed in which a first conductive substrate portion has a first face and a second conductive substrate portion has a second face opposed to the first face. A first electrode material is disposed in electrical contact with the first face, an electrolyte material is disposed in contact with the first electrode material, a second electrode material is disposed in contact with the electrolyte material, and a conductive tab disposed in contact with the second electrode material. The first conductive substrate portion, the first electrode material, and the conductive tab extend outward beyond a particular edge of the second conductive substrate portion.

Disclosed herein are a multilayer electrode and a lithium secondary battery including the same. The multilayer electrode includes an electrode current collector for transmitting electrons between an external wire and an electrode active material and three or more electrode mixture layers sequentially applied to the electrode current collector, wherein each of the electrode mixture layers includes an electrode active material and a conducting agent, and wherein the content of the conducting agent of one of adjacent electrode mixture layers that is relatively close to the current collector in the direction in which the electrode mixture layers are formed is higher than that of the conducting agent of the other of the adjacent electrode mixture layers that is relatively distant from the current collector.

Embodiments of the present invention are in the field of materials, apparatus, process, methods, and designs for manufacture of a thin film energy storage devices with a capacity greater then 1 mA-hr-cm.sup.−2 including thin film Lithium metal and Li+ ion batteries and capacitors having high energy density and high cycle life due to the incorporation of at least one vacuum thin film with respect to protection and electrical conductivity of the electrodes, and at least one vacuum thin film electrolyte for electrical insulation of the electrodes and ion conduction after assembly for low self discharge and high cycle life battery cells.

A method for manufacturing a nonaqueous electrolyte secondary battery according to an embodiment of the present invention is a method for manufacturing a nonaqueous electrolyte secondary battery including a positive electrode plate and a negative electrode plate provided with a negative electrode mixture layer containing graphite and a silicon material and includes a step of applying positive electrode mixture slurry containing a lithium-transition metal composite oxide and polyvinylidene fluoride to a positive electrode current collector, a step of forming a positive electrode mixture layer by drying the positive electrode mixture slurry, and a step of heat-treating the positive electrode mixture layer. The temperature of heat treatment is preferably 160° C. to 350° C.

There is provided a secondary battery including a cathode, an anode including an anode active material layer and a coating film, and an electrolytic solution. The anode active material layer includes a titanium-containing compound, and a surface of the anode active material layer is coated with the coating film. The electrolytic solution includes one or more of unsaturated cyclic carbonate esters. Porosity of a portion of the anode active material layer measured with use of a mercury intrusion technique is within a range from 30% to 50% both inclusive. The portion of the anode active material layer is cut together with a portion of the coating film from a surface of the coating film to a depth of 10 μm.