Mitsui Minings & Melting Co., Ltd.

Naoki Kumada

Shinya Kagei

Yasuhiro Ochi

Keisuke Miyanohara

Yoshimi Hata

Tsuneyoshi Kamada

Hidetoshi Inoue

Kenji Sasaki

Tomoya Takeuchi

Hideyuki Nagaoka

Masashi Sakano

A zinc foil is provided that can be used as a negative electrode active material, and in a battery including the zinc foil as a negative electrode active material, the amount of gas generated during long term storage of the battery is reduced as compared with that in a battery including a conventional zinc foil. The zinc foil contains zinc as a main material and bismuth. The bismuth content is 100 ppm or more and 10000 ppm or less on a mass basis. The zinc crystal grain size is 0.2 μm or more and 8 μm or less. The bismuth crystal grain size is less than 1000 nm, as measured in a backscattered electron image obtained using a scanning electron microscope. The zinc foil is free of aluminum and/or lead, or even if the zinc foil contains aluminum and/or lead, the aluminum content is 1% or less on a mass basis and/or the lead content is 200 ppm or less on a mass basis.

Zinc foil, primary battery negative electrode active material using same, and zinc foil production method

In order to provide a novel spinel type lithium transition metal oxide (LMO) having excellent power performance characteristics, in which preferably both the power performance characteristics and the cycle performance at high temperature life characteristics may be balanced, a novel spinel type lithium transition metal oxide with excellent power performance characteristics is proposed by defining the inter-atomic distance Li&#x2014;O to be 1.978 &#x212b; to 2.006 &#x212b; as measured by the Rietveld method using the fundamental method in a lithium transition metal oxide represented by the general formula LiMO(where M is a transition metal consisting of three elements Mn, Al and Mg and x is 0.01 to 0.08).

Spinel type lithium transition metal oxide

In a lithium transition metal oxide having a layered structure, one is provided, which is particularly excellent as a positive electrode active material of a battery on board of an electric vehicle or a hybrid vehicle in particular. A lithium transition metal oxide having a layered structure is proposed, wherein the ratio of the crystallite diameter determined by Measurement Method 1 according to the Rietveld method with respect to the mean powder particle diameter (D50) determined by the laser diffraction/scattering-type particle size distribution measurement method is 0.05 to 0.20.

Lithium transition metal oxide having layered structure

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Takehara, Japan

Naoki Kumada