Mitsui Minings & Melting Co., Ltd.

Keisuke Miyanohara

Shinya Kagei

Yoshimi Hata

Yasuhiro Ochi

Naoki Kumada

Kenji Sasaki

Tetsuya Mitsumoto

Kyohei Yamaguchi

Shingo Kikugawa

Tomoya Takeuchi

A hydrogen storage alloy suitable for prescribed pretreatment, that is, pretreatment wherein mechanical pulverization is performed after pulverizing a hydrogen storage alloy and absorbing/desorbing hydrogen is provided. The hydrogen storage alloy comprises a parent phase having a CaCu-type, that is, an AB-type crystal structure, wherein the A site is constituted from a rare earth element containing La; and the B site does not contain Co and contains at least Ni, Al, and Mn, with the ratio (Mn/Al) of the content of Mn (molar ratio) to the content of Al (molar ratio) being 0.60 or more and less than 1.56, and the ratio (La/(Mn+Al)) of the content of La (molar ratio) to the total content of the content of Al (molar ratio) and the content of Mn (molar ratio) being more than 0.92.

Hydrogen storage alloy

A hydrogen storing alloy containing only a few impurities leading to a short circuit where the yield can be maintained even when the alloy is subjected to magnetic separation treatment. A hydrogen storing alloy includes a matrix phase having an AB5 type crystal structure, the alloy having a misch metal (referred to as 'Mm') in an A-site in an ABx composition and having any one or at least one of Ni, Al, Mn, and Co in a B-site in the ABx composition, wherein the ratio (referred to as 'ABx') of the total number of moles of elements comprising the B site to the total number of moles of elements comprising the A site is 5.00&#x3c;ABx&#x2266;5.40; the content of Co is more than 0.0 mol % and less than 0.7 mol %; and residual magnetization is more than 0 emu/g and 0.020 emu/g or less.

Hydrogen storing alloy

Provided is spinel-type lithium transition metal oxide (LMO) used as a positive electrode active material for lithium battery, said LMO being capable of simultaneously achieving all output characteristics (rate characteristics), high temperature cycle life characteristics, and rapid charging characteristics. The disclosed is spinel-type lithium transition metal oxide including, besides Li and Mn, one or more elements selected from a group consisting of Mg, Ti, Ni, Co, and Fe, and having crystallite size of between 200 nm and 1000 nm and strain of 0.0900 or less. Because the crystallite size is markedly large, oxygen deficiency is markedly little, and the structure is strong, when the LMO is used as a positive electrode active material for lithium secondary batteries, all output characteristics (rate characteristics), high temperature cycle life characteristics, and rapid charging characteristics can be achieved simultaneously.

Spinel-type lithium transition metal oxide and positive electrode active material for lithium battery

Provided is a lithium ion battery wherein the content of an iron element contained in a positive electrode active material (measured with an ICP emission spectrophotometer) is 10 ppm or more, and magnetic materials having a size of 0.70 times or greater than the thickness of a separator layer are substantially not included in order to provide a lithium ion battery which has small voltage drop during a charge state or under storage at high temperatures.

Positive electrode active material for lithium-ion battery and lithium-ion battery

With the object of providing a positive electrode active material for lithium battery that can increase the filling density, can increase the output characteristics, and furthermore, with a small voltage decrease during conservation at high temperature in a charged state, a positive electrode active material for lithium battery is proposed, containing a spinel type (Fd3-m) lithium transition metal oxide represented by general formula LiMO(where M represents a transition metal including Mn, Al and Mg, x represents 0.01 to 0.08 and 0&#x2266;&#x3b4;) and a boron compound, the inter-the atomic distance Li&#x2014;O of the spinel type lithium transition metal oxide being 1.971 &#x212b; to 2.006 &#x212b;, and the amount of magnetic substance measured for the positive electrode active material for lithium battery being 600 ppb or less.

Positive electrode active material for lithium battery

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.

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Takehara, Japan

Keisuke Miyanohara