Kyushu University

Kanto Denka Kogyo Co., Ltd.

Ngk Insulators, Inc.

Tomoko Iwanaga

Shigeto Okada

Jun-ichi Yamaki

Osamu Omae

Kumiko Sueto

Tomoyuki Shiratsuchi

Shinji Iizuka

Takeshi Shimada

Jun-Ichi Yamaki

Hiroyuki Katsukawa

Michio Takahashi

Tomoyuki c/o Kyushu University Shiratsuchi

The present invention provides a positive electrode active material that has rate characteristics suitable for nonaqueous electrolyte batteries and particularly nonaqueous electrolyte secondary batteries, a method by which this positive electrode active material can be easily mass produced, and a high-performance nonaqueous electrolyte battery that has a positive electrode active material obtained by this method. The present invention relates to a method of producing a positive electrode active material, the method comprising a step of mixing a carbon source with lithium manganese phosphate LiMnPOor a compound LiMnMPO(where, 0&#x2266;x&#x3c;1 and M is at least one metal element selected from the group consisting of Co, Ni, Fe, Zn, Cu, Ti, Sn, Zr, V, and Al) containing lithium manganese phosphate LiMnPOas a solid solution composition, and heat treating the obtained mixture under an inert gas atmosphere.

Method of producing positive electrode active material and nonaqueous electrolyte battery using the same

A positive electrode for a non-aqueous electrolytic secondary cell and a non-aqueous electrolytic secondary cell are provided, which exhibit a high potential in a 4 V region, and have a high capacity, safety, excellent cycle characteristics, and satisfactory high-temperature characteristics. The positive electrode active material is a mixture of an olivine type lithium manganese phosphate and a spinel type lithium manganate.

Positive electrode for non-aqueous electrolytic secondary cell and non-aqueous electrolytic secondary cell

The present invention provides an olivine-type positive electrode active material that is an inexpensive and very safe positive electrode active material that also exhibits excellent battery properties even at high energy densities. The present invention also provides a method of producing this olivine-type positive electrode active material and a nonaqueous electrolyte battery that has a positive electrode that contains this olivine-type positive electrode active material. The present invention relates to a positive electrode active material that comprises an olivine-type lithium manganese phosphate compound represented by the following general formula (1)LiMnMPO&#x2003;&#x2003;(1)(in the formula, 0&#x3c;x&#x3c;2, 0&#x3c;y&#x3c;1, 0&#x3c;a&#x3c;1, and M is at least one metal element selected from the group consisting of Co, Ni, Fe, Zn, Cu, Ti, Sn, Zr, V, and Al) and that has a particle diameter of 10 to 500 nm.

Positive electrode active material and method of producing the same and nonaqueous electrolyte battery having positive electrode containing positive electrode active material

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Fukuoka, Japan

Tomoko Iwanaga