Matsushita Electric Industrial Co., Ltd.

Jun Nunome

Kazuya Iwamoto

Atsushi Ueda

Hizuru Koshina

Shoichiro Watanabe

Hiroshi Yoshizawa

Takuya Nakashima

Seiji Tao

Masaki Kitagawa

Kiyomi Kato

Hiroshi Matsuno

Yutaka Kawatate

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 non-aqueous electrolyte secondary battery which comprises a positive electrode containing a lithium-containing oxide; a negative electrode containing a material capable of absorbing and releasing lithium; and a non-aqueous electrolyte containing a non-aqueous solvent containing at least one non-cyclic ester and which is excellent in storage stability at high temperatures is provided by adding an oxidation resistance improving agent such as triphenylmethane, tetraphehylmethane or the like.

Secondary battery having a non-aqueous electrolyte

Secondary battery including an electrolytic solution with an organic additive

A battery excellent in high temperature storage characteristic is presented. It comprises a positive electrode having a positive electrode active material containing an transition metal complex oxide containing lithium , a negative electrode containing a negative electrode material capable of storing and releasing a lithium ion, and an electrolytic solution containing a nonaqueous solvent, an electrolyte, and an organic compound expressed in formula 1. ##STR1## where R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 have individually at least one of H and a group containing a vinyl group, and the number of H substituent is four or less.

Secondary battery comprising a polymerizable material in its electrolyte

Heavy-load discharge characteristics of a primary battery are improved. Alternatively, the high-rate discharge characteristics of a secondary battery are improved. This is accomplished by employing manganese oxides as the positive active material on which a surface modified layer is formed. The surface modified layer consists of an oxide of at least one element selected from the group consisting of titanium, cobalt, nickel, strontium, lanthanum and its compound added mainly with a compound made of manganese oxide on the surface of manganese oxide powder consisting of manganese dioxide or a complex oxide of manganese and lithium. This is accomplished by using a solution of salt of at least one element selected from the group consisting of titanium, cobalt, nickel, strontium, and lanthanum to which a manganese salt and a solution, to which a solution of manganese salt are added.

Method of manufacturing positive active material for batteries

Batteries and a method of manufacturing positive active material for the

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Yawata, Japan

Jun Nunome