Tosoh Corporation

Ken-Ichi Takahashi

Eiichi Iwata

Takashi Mori

Ken-ichi Takahashi

Miki Yamashita

Naoto Suzuki

Masaki Okada

Setsuo Yoshida

Yasuhiro Fujii

Koji Maeda

Takuya Kawaguchi

Yasushi Ohsaki

Masaharu Doi

Masanori Sawano

Takashi M{overscore (o)}ri

To provide metal-containing trimanganese tetraoxide combined particles with which a metal-substituted lithium manganese oxide excellent as a cathode material for a lithium secondary battery can be obtained, and their production process. Metal-containing trimanganese tetraoxide combined particles containing a metal element (excluding lithium and manganese). Such metal-containing trimanganese tetraoxide combined particles can be obtained by a production process comprising a crystallization step of crystalizing a metal-substituted trimanganese tetraoxide not by means of metal-substituted manganese hydroxide from a manganese salt aqueous solution containing manganese ions and metal ions other than manganese.

Metal-containing trimanganese tetraoxide composite particles and method for producing same

Trimanganese tetraoxide has high reactivity with a lithium compound, is excellent in handling efficiency, and is suitable as a manganese material of a lithium manganese oxide, and its production process. Trimanganese tetraoxide particles including trimanganese tetraoxide primary particles having an average primary particle size of at most 2 &#x3bc;m agglomerated, the pore volume of pores being at least 0.4 mL/g. The most frequent pores are preferably pores having a diameter of at most 5 &#x3bc;m. The trimanganese tetraoxide particles can be obtained by producing trimanganese tetraoxide particles, which includes directly crystallizing trimanganese tetraoxide from a manganese salt aqueous solution, wherein the manganese salt aqueous solution and an alkali aqueous solution are mixed so that the oxidation-reduction potential is at least 0 mV and OH/Mn(mol/mol) is at most 0.55, to obtain a slurry, and the solid content concentration of the slurry is adjusted to be at most 2 wt %.

Trimanganese tetraoxide and its production process

There is provided manganese oxide having a pore volume fraction of no greater than 20% for pores with diameters of 10 &#x3bc;m or greater, as measured by mercury porosimetry, and a tap density of 1.6 g/cmor greater, and a method for producing it. There is also provided a method for producing a lithium manganese composite oxide using the manganese oxide.

Manganese oxide and method for producing same, and method for producing lithium manganese composite oxide using same

Spinel-type lithium-manganese oxide containing heteroelements preparation process and use thereof

Lithium manganese oxide, and process for its production and secondary cell employing it

Spinel-type lithium-manganese oxide containing heteroelements, preparation process and use thereof

A novel lithium-manganese oxide composition suitable for use in lithium secondary batteries as an active material for positive electrodes, said oxide having a spinel type crystal structure, an Li:Mn molar ratio of 0.9-1.10:2.00, a mean Mn oxidation number of 3.40-3.60 valencies, and a BET specific surface area of at least 1 m.sup.2 /g, substantially all the primary particles of said oxide being less than 1 .mu.m; a process for preparing such an oxide and a lithium secondary battery containing such an oxide are also disclosed.

Spinel type lithium-mangenese oxide material, process for preparing the

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Yamaguchi, Japan

Eiichi Iwata