Sanyo Electric Co., Ltd.

Denis Yau Wai Yu

Kazunori Donoue

Shin Fujitani

Masahisa Fujimoto

Takao Inoue

Katsunori Yanagida

Hiroshi Kurokawa

Naoki Imachi

Shigeki Matsuta

Toshikazu Yoshida

Tetsuyuki Murata

Tetsuo Kadohata

A non-aqueous battery with improved volume energy density and enhanced load characteristics is made available even when using olivine-type lithium phosphate as a positive electrode active material. The non-aqueous electrolyte battery of the present invention is provided with a positive electrode () containing lithium iron phosphate as a positive electrode active material, a negative electrode (), and a non-aqueous electrolyte (). In the positive electrode (), a positive electrode active material-containing layer that is made of the positive electrode active material, a conductive agent, and a binder agent is formed on a positive electrode current collector. The positive electrode current collector has a thickness of less than 20 &#x3bc;m and its surface that is in contact with the positive electrode active material-containing layer has a mean surface roughness Ra of greater than 0.026.

Non-aqueous electrolyte battery

A positive electrode active material having a lithium-excess lithium-transition metal composite oxide particle represented by the chemical formula LiMnNiCoO. The lithium-excess lithium-transition metal composite oxide particle has an inner portion (1) having a layered structure and a surface adjacent portion (2) having a crystal structure gradually changing from a layered structure to a spinel structure from the inner portion (1) toward the outermost surface portion (3). The layered structure and the spinel structure have an identical ratio of the amount of Mn and the total amount of Ni and Co.

Positive electrode active material including particle comprising crystal structure changing from a layered structure to a spinel structure, method of manufacturing the positive electrode active material, and non-aqueous electrolyte secondary battery using the positive electrode active material

Using a non-aqueous electrolyte secondary battery containing lithium iron phosphate as a positive electrode active material and graphite as a negative electrode active material, a low-cost, high energy density battery is provided that exhibits good performance at high rate current and good cycle performance even at high temperature. The non-aqueous electrolyte secondary battery has a positive electrode having a positive electrode current collector and a positive electrode active material-containing layer formed on a surface of the positive electrode current collector, the positive electrode active material-containing layer containing a conductive agent and a positive electrode active material including lithium iron phosphate, a negative electrode containing a carbon material, and a non-aqueous electrolyte. The non-aqueous electrolyte contains vinylene carbonate.

Non-aqueous electrolyte secondary battery

A method of producing an active material for a lithium secondary battery, by which impurities causing problems in synthesizing an active material for a lithium secondary battery, including a lithium transition metal oxyanion compound are removed efficiently and enhancement of an energy density is realized, is provided. By cleaning the active material for a lithium secondary battery, including a lithium transition metal oxyanion compound, with a pH buffer solution, for example, it is possible to efficiently remove just only impurities such as LiPOor LiCO, or a substance, other than LiFePO, in which the valence of Fe is bivalent such as FeSO, FeO or Fe(PO)without dissolving Fe of LiFePO.

Method of producing active material for lithium secondary battery, method of producing electrode for lithium secondary battery, method of producing lithium secondary battery, and method of monitoring quality of active material for lithium secondary battery

A non-aqueous electrolyte battery and a method of manufacturing the battery are provided. The non-aqueous electrolyte battery has a positive electrode including a positive electrode active material-layer stack containing a plurality of different positive electrode active materials and formed on a positive electrode current collector surface, a negative electrode including a negative electrode active material layer, and a separator interposed between the electrodes. The positive electrode active material-layer stack includes two or more layers respectively containing different positive electrode active material components, and of the two or more layers, the layer nearer the positive electrode current collector is formed by coating the collector with a positive electrode active material having the highest resistance increase rate and a conductive agent contained in that positive electrode active material by cold spraying.

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Kobe, Japan

Denis Yau Wai Yu