Envision Aesc Japan Ltd.

Automotive Energy Supply Corporation

Nec Energy Devices, Ltd.

Hidetoshi Tamura

Yuji Tanjo

Hiroshi Yageta

Tatsuji Numata

Ippei Waki

Provided is a positive electrode for a lithium ion secondary battery which includes a positive electrode active material layer including a positive electrode active material that is provided to at least one surface of a positive electrode current collector. The positive electrode active material includes a lithium nickel cobalt manganese composite oxide mixture containing two or more kinds of lithium nickel cobalt manganese composite oxides. An average primary particle diameter of the lithium nickel cobalt manganese composite oxide mixture is in a range of 0.4 micrometers or more and 2 micrometers or less. An average secondary particle diameter of the lithium nickel cobalt manganese composite oxide mixture is in a range of 4 micrometers or more and 12 micrometers or less. The positive electrode active material layer includes a conductive agent in a range of 1 to 5% based on a weight of the positive electrode active material layer.

Positive electrode for lithium ion secondary battery, and lithium ion secondary battery

Provided is an electrode for a lithium ion secondary battery which includes an electrode current collector where an electrode active material mixture for a lithium ion secondary battery is disposed. The electrode active material mixture for a lithium ion secondary battery includes an electrode active material, a conductive agent containing carbon black, and a binder, and a maximum particle diameter (D) of the carbon black is smaller than a maximum particle diameter (D) of the electrode active material.

Electrode for lithium ion secondary battery, and lithium ion secondary battery

Provided is a nonaqueous electrolyte secondary battery that includes a laminate film exterior container housing an electrode body and an electrolyte solution. In the nonaqueous electrolyte secondary battery, the electrode body includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive electrode active material layer formed on a positive electrode current collector. The negative electrode includes a negative electrode active material layer formed on a negative electrode current collector. The positive electrode active material layer includes secondary particles of a lithium nickel cobalt manganese composite oxide. The secondary particle includes a group of primary particles of a lithium nickel cobalt manganese composite oxide with a layered crystal structure. The primary particle has a cross-sectional area of 1.50 &#x3bc;mor less. The layered crystal structure has a lattice constant 'c' of 14.240 &#x212b; or less.

Nonaqueous electrolyte secondary battery

An organic acid included in a nonaqueous electrolyte solution of a secondary battery is reduced. During preparation of a film-covered batterythe nonaqueous electrolyte solution is injected into an coveringof the film-covered batteryhaving an electrode including: the electrode active material, the binder, and the organic acid, the organic acid in the nonaqueous electrolyte solution is decomposed by electrical charging of a battery until a voltage level is equal to or above a decomposition voltage of the organic acid, and the gas that is produced by decomposition is degassed from the cut portionof the covering

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Kanagawa, Japan

Hidetoshi Tamura