Matsushita Electric Industrial Co., Ltd.

Yutaka Kawatate

Masaya Okochi

Ryoichi Tanaka

Kaoru Inoue

Masatoshi Nagayama

Masaki Kitagawa

Jun Nunome

Kiyomi Kato

Hiroshi Matsuno

Hideya Asano

Norihiro Yamamoto

Hideki Sano

Masaya Sugafuji

A non-aqueous electrolyte secondary battery comprising: an electrode plate assembly; a non-aqueous electrolyte; and an outer jacket accommodating the electrode plate assembly and the non-aqueous electrolyte therein, the electrode plate assembly comprising a positive electrode plate, a negative electrode plate and a separator interposed between the positive electrode plate and the negative electrode plate, the separator comprising a polyolefin resin, wherein (1) the separator comprises at least one layer comprising a polypropylene resin, (2) the layer comprising a polypropylene resin contains an antioxidant with a melting point of 60&#xb0; C. or higher, and (3) the layer comprising a polypropylene resin and the positive electrode are in contact with one another.

Non-aqueous electrolytic secondary battery

A lithium ion secondary battery comprising: a positive electrode; a negative electrode; and a non-aqueous electrolyte, the positive electrode comprising a positive electrode active material and a binder, the positive electrode active material comprising a lithium-containing composite oxide represented by the chemical formula:Li(CoMgM)Owhere M is at least one selected from Ni, Mn and Al, 0&#x2266;a&#x2266;1.05, 0.005&#x2266;x&#x2266;0.025, 0&#x2266;y&#x2266;0.25, 0.85&#x2266;b&#x2266;1.1, and 1.8&#x2266;c&#x2266;2.1.

Lithium ion secondary cell

A lithium ion secondary battery comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode comprises a positive electrode active material, a conductive agent and a binder, the positive electrode active material comprises a lithium-containing composite oxide represented by the formula Li(CoMgM)O, where M is at least one selected from Ni and Al, 0&#x2266;a&#x2266;1.05, 0.03&#x2266;x&#x2266;0.15, 0&#x2266;y&#x2266;0.25, 0.85&#x2266;b&#x2266;1.1 and 1.8&#x2266;c&#x2266;2.1, and the amount of the conductive agent contained in the positive electrode is not more than 3.0 parts by weight per 100 parts by weight of the positive electrode active material.

Lithium ion secondary battery

Growing community of inventors

Hirakata, Japan

Yutaka Kawatate