Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Kiyomi Kato

Kaoru Inoue

Tetsuya Hayashi

Yusuke Fukumoto

Kohei Suzuki

Shigeo Ikuta

Kazuya Iwamoto

Hizuru Koshina

Shoichiro Watanabe

Shinji Nakanishi

Masaki Kitagawa

Hiroyuki Murai

Jun Nunome

Hiroshi Matsuno

Yutaka Kawatate

Norihiro Yamamoto

Yukishige Inaba

Hideki Sano

Masaya Sugafuji

A lithium ion secondary battery includes a positive electrode containing a composite lithium oxide, a negative electrode capable of absorbing and desorbing lithium ions, a sheet-like separator interposed between the positive electrode and the negative electrode, a non-aqueous electrolyte and a porous electron-insulating film attached to the surface of the negative electrode. The sheet-like separator is a monolayer film made of polypropylene resin or a multilayer film whose layer to be in contact with the positive electrode is made of polypropylene resin. The porous electron-insulating film includes an inorganic oxide filler and a binder. The inorganic oxide filler contains aluminum oxide or magnesium oxide. The sheet-like separator has a thickness not less than 1.5 times the thickness of the porous electron-insulating film.

Lithium ion secondary battery and charging method therefor, and charge or charge/discharge control system for lithium ion secondary battery

A non-aqueous electrolyte secondary battery including: a positive electrode; a negative electrode; a separator interposed between the positive electrode and the negative electrode; a non-aqueous electrolyte; and a porous insulating film adhered to a surface of at least one selected from the group consisting of the positive electrode and the negative electrode, the porous insulating film including an inorganic oxide filler and a film binder, wherein the ratio R of actual volume to apparent volume of the separator is not less than 0.4 and not greater than 0.7, and wherein the ratio R and a porosity P of the porous insulating film satisfy the relational formula: &#x2212;0.10&#x2266;R&#x2212;P&#x2266;0.30.

Non-aqueous electrolyte secondary battery

A lithium ion secondary battery includes a positive electrode containing a composite lithium oxide, a negative electrode capable of absorbing and desorbing lithium ions, a sheet-like separator interposed between the positive electrode and the negative electrode, a non-aqueous electrolyte and a porous electron-insulating film attached to the surface of the negative electrode. The sheet-like separator is a monolayer film made of polypropylene resin or a multilayer film whose layer to be in contact with the positive electrode is made of polypropylene resin. The porous electron-insulating film includes an inorganic oxide filler and a binder. The sheet-like separator has a thickness not less than 1.5 times the thickness of the porous electron-insulating film.

Nonaqueous electrolyte secondary battery

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

Lithium batteries having excellent high rate characteristics and low-temperature characteristics, and less in evolution of gases and superior in discharge characteristics are provided by using LiCoO mixed with CaO or Cr O or the like as an active material of positive electrode in combination with a non-aqueous electrolyte containing a mixed electrolyte salt comprising both a fluorine-containing inorganic anion lithium salt and a lithium imide salt.

Lithium secondary battery

Growing community of inventors

Moriguchi, Japan

Kiyomi Kato