Kabushiki Kaisha Toshiba

Toshiba Battery Co., Ltd.

Petoca, Ltd.

Tokyo Shibaura Denki Kabushiki Kaisha

Takahisa Ohsaki

Norio Takami

Takashi Kobayashi

Motoya Kanda

Hiroyuki Hasebe

Takashi Kuboki

Shuji Yamada

Asako Satoh

Hideaki Morishima

Yoshikazu Kobayashi

Haruchika Ishii

Natsuki Toyota

Asako Sato

Seiichi Hikata

Toshio Tamaki

Kuniaki Inada

Norihito Kurisu

Yuichi Sato

Tomokazu Morita

Kazuya Hiratsuka

Michikazu Hara

Yoshiaki Asami

Yoshiyuki Nishimura

Hideyuki Nakajima

Kiyoshi Mitsuyasu

Yasushi Katsuta

Junichi Takabayashi

Yoshiyasu Aoki

The present invention provides a nonaqueous electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode including a material for absorbing-desorbing lithium ions, and a separator arranged between the positive electrode and the negative electrode, a nonaqueous electrolyte impregnated in the electrode group and including a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent, and a jacket for housing the electrode group and having a thickness of 0.3 mm or less, wherein the nonaqueous solvent &#x3b3;-butyrolactone in an amount larger than 50% by volume and not larger than 95% by volume based on the total amount of the nonaqueous solvent.

Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte secondary battery includes an electrode body including a positive electrode and a negative electrode superimposed upon each other with a separator interposed therebetween. The negative electrode is superimposed upon the positive electrode in a state where a negative electrode active material layer, except the part on a proximal end part of a negative electrode tab, is positioned inside an outer edge of a positive electrode active material layer of the positive electrode. A width H1 of the negative electrode active material layer including the part on the proximal end part of the negative electrode tab, width H2 of the negative electrode active material layer or negative electrode current collector at a part other than the negative electrode tab, and width H3 of the positive electrode active material layer are formed to satisfy the relationships of H2&#x3c;H3, and (H1&#x2212;H2)&#x2267;(H3&#x2212;H2)&#xf7;2.

Non-aqueous electrolyte secondary battery, electrode used for secondary battery, and method of manufacturing electrode

A non-aqueous electrolyte secondary battery includes an electrode body including a positive electrode and a negative electrode superimposed upon each other with a separator interposed therebetween. The negative electrode is superimposed upon the positive electrode in a state where a negative electrode active material layer, except the part on a proximal end part of a negative electrode tab, is positioned inside an outer edge of a positive electrode active material layer of the positive electrode. A width Hof the negative electrode active material layer including the part on the proximal end part of the negative electrode tab, width Hof the negative electrode active material layer or negative electrode current collector at a part other than the negative electrode tab, and width Hof the positive electrode active material layer are formed to satisfy the relationships of H&#x3c;H, and (H&#x2212;H)&#x2267;(H&#x2212;H)&#xf7;2.

There is proposed a non-aqueous electrolyte secondary battery having an electrode assembly which is impregnated with a non-aqueous electrolyte solution, wherein the battery can be made thin while maintaining improved capacity, large-current characteristics and cycle life. The non-aqueous electrolyte secondary battery comprises a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte solution. The production process of the battery comprises steps of preparing an electrode assembly by interposing a separator between a positive electrode and a negative electrode, impregnating the electrode assembly with an organic solvent which can dissolve the binder of the positive- and/or negative electrodes, bonding the positive electrode and the separator together and bonding the negative electrode and the separator together by drying the electrode assembly, and impregnating the electrode assembly with a non-aqueous electrolyte solution.

Method of binding an electrolyte assembly to form a non-aqueous electrolyte secondary battery

Nonaqueous electrolyte secondary battery, carbon material for negative electrode, and method for manufacturing carbon material for negative electrode

There is provided a secondary battery comprising an electrode group comprising a positive electrode, a negative electrode having a negative electrode collector and a negative electrode layer held to the collector, and a separator interposed between the positive electrode and the negative electrode layer, a nonaqueous electrolyte held by the electrode group, and a jacket housing the electrode group and having a thickness of not more than 0.3 mm, wherein the positive electrode, the negative electrode and the separator are formed integral, and the peeling strength between the negative electrode layer and the separator is lower than the peeling strength between the negative electrode layer and the negative electrode collector.

Secondary battery

Provided is a nonaqueous electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode, and a porous separator interposed between the positive electrode and the negative electrode, the pores of the porous separator being closed when heated, a nonaqueous electrolyte held by the porous separator, and a jacket formed of a sheet including a thermoplastic resin layer forming at least a portion of the inner surface, having the electrode group housed therein, and having mutually facing regions of the thermoplastic resin layer heat-sealed to each other to seal the electrode group therein, wherein the positive electrode, the negative electrode and the separator are made integral, and the thermoplastic resin layer has a melting point higher than a pore-closing initiating temperature of the porous separator at which the pores of the separator begin to be closed.

The present invention provides a nonaqueous electrolyte secondary battery, comprising an electrode group including a positive electrode, a negative electrode including a material for absorbing-desorbing lithium ions, and a separator arranged between the positive electrode and the negative electrode, a nonaqueous electrolyte impregnated in the electrode group and including a nonaqueous solvent and a lithium salt dissolved in the nonaqueous solvent, and a jacket for housing the electrode group and having a thickness of 0.3 mm or less, wherein the nonaqueous solvent &ggr;-butyrolactone in an amount larger than 50% by volume and not larger than 95% by volume based on the total amount of the nonaqueous solvent.

The present invention provides a nonaqueous electrolyte secondary battery, comprising a jacket having a wall thickness not larger than 0.25 mm, a positive electrode housed in the jacket and containing a positive electrode active material, a negative electrode housed in the jacket and containing a negative electrode active material, and a nonaqueous electrolyte housed in the jacket, wherein the positive electrode active material comprises at least one kind of oxide selected from the group consisting of an oxide containing an element M, Li and Ni and an oxide containing an element M, Li, Ni and Co, the element M being at least one element selected from the group consisting of Al, B, Sn and Nb, and the pH of the positive electrode active material falls within a range of between 10 and 12.

Non-aqueous electrolyte secondary battery and method of production of the same

Battery with an additive to evolve a gas at high temperature

This invention provides a lithium secondary battery comprising a positive electrode, a negative electrode comprising a carbonaceous material which is capable of absorbing and desorbing lithium ions, and a nonaqueous electrolyte, wherein the carbonaceous material has a region of amorphous carbon structure and a region of graphite structure, and the carbonaceous material has a true density of 1.8 g/cm or more and a peak in powder X-ray diffraction which corresponds to not more than 0.340 nm in an interplanar spacing d derived from (002) reflection.

Lithium secondary battery

Growing community of inventors

Yokohama, Japan

Takahisa Ohsaki