Kabushiki Kaisha Toshiba

Hideaki Morishima

Norio Takami

Hiroki Inagaki

Hidesato Saruwatari

Yumi Fujita

Haruchika Ishii

Masaomi Nakahata

Seiichi Hikata

Kazuhiko Mori

Takahisa Ohsaki

Yoshikazu Kobayashi

Shuji Yamada

Ikuo Uematsu

Yuji Sato

Takashi Kobayashi

Shinsuke Matsuno

Natsuki Toyota

Yoshinao Tatebayashi

Hideyuki Kanai

Kenta Fukatsu

According to one embodiment, a method for producing an electrode, includes applying tensile force. The electrode includes a strip current collector, a current collector exposed portion, and an active material-containing layer. In the applying tensile force, arranging a strip electrode plate on a roller including a step portion and a recessed portion such that the current collector exposed portion is positioned on the step portion and the active material-containing layer is positioned on the recessed portion, and then applying tensile force to the strip electrode plate in a longitudinal direction of the strip electrode plate.

Method for producing electrode and method for producing battery

A nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The negative electrode contains a lithium compound and a negative electrode current collector supporting the lithium compound. A log differential intrusion curve obtained when a pore size diameter of the negative electrode is measured by mercury porosimetry has a peak in a pore size diameter range of 0.03 to 0.2 &#x3bc;m and attenuates with a decrease in pore size diameter from an apex of the peak. A specific surface area (excluding a weight of the negative electrode current collector) of pores of the negative electrode found by mercury porosimetry is 6 to 100 m/g. A ratio of a volume of pores having a pore size diameter of 0.05 &#x3bc;m or less to a total pore volume is 20% or more.

Nonaqueous electrolyte battery, battery pack and vehicle

According to one embodiment, there is provided a nonaqueous electrolyte secondary battery. A negative electrode current collector comprises a coated portion on which the negative electrode active material layer is provided and a noncoated portion which is adjacent to the coated portion, in which the negative electrode active material layer is not present. A density of the negative electrode active material layer is within a range of 2.1 g/cc to 2.4 g/cc. A ratio W/Wof a mass of the coated portion per unit area (W) to a mass of the noncoated portion per unit area (W) is from 0.997 to 1.

Nonaqueous electrolyte secondary battery

A nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. At least one of the positive electrode and the negative electrode comprises a current collector made of aluminum or an aluminum alloy and an active material layer laminated on the current collector. The active material layer contains first active material particles having an average particle diameter of 1 &#x3bc;m or less and a lithium diffusion coefficient of 1&#xd7;10cm/sec or less at 20&#xb0; C., and second active material particles having an average particle diameter of 2 to 50 &#x3bc;m. A true density of the second active material particles is larger by 0.01 to 2.5 g/cmthan a true density of the first active material particles.

Nonaqueous electrolyte battery, battery pack and rechargeable vacuum cleaner

A method of producing an electrode including decreasing a yield stress of a slurry containing an active material to two-thirds or less, and applying the slurry to a current collector.

Method of producing electrode and method of producing nonaqueous electrolyte battery

According to one embodiment, there is provided a nonaqueous electrolyte secondary battery. A positive electrode current collector comprises a coated portion on which the positive electrode active material layer is provided and a noncoated portion which is adjacent to the coated portion in a direction parallel to the first surface, in which the positive electrode active material layer is not present. A density of the positive electrode active material layer is within a range of 3.1 g/cc to 3.4 g/cc. A ratio W1/W2 of a mass of the coated portion per unit area (W1) to a mass of the noncoated portion per unit area (W2) is from 0.997 to 1.

According to one embodiment, a double-sided coating apparatus includes a first coating head arranged on one side of a raw material to coat the one side with a coating liquid by alternately forming a coating region and a non-coating region in a direction crossing a delivery direction, a second coating head arranged on the other side of the raw material to coat the other side with the coating liquid by alternately forming the coating region and the non-coating region in the direction crossing the delivery direction, and a coating roller arranged near a position on the one side of the raw material and opposite to the second coating head across the raw material and having a large-diameter portion and a small-diameter portion with different diameters along an axial direction with the small-diameter portion opposite to the coating region and the large-diameter portion opposite to the non-coating region.

Double-sided coating apparatus and double-sided coating method

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 battery includes an electrode group includes a positive electrode and a negative electrode disposed through a separator, and a non-aqueous electrolyte. The negative electrode comprises a current collector and a porous negative electrode layer formed on the current collector and containing a lithium compound. The porous negative electrode layer has a first peak at a pore diameter of 0.04 to 0.15 &#x3bc;m and a second peak at a pore diameter of 0.8 to 6 &#x3bc;m in the relation between the pore diameter and log differential intrusion obtained in the mercury press-in method.

Non-aqueous electrolyte battery

A nonaqueous electrolyte battery includes a positive electrode, a negative electrode containing a lithium-titanium composite oxide and a lithium-absorbing material in a weight ratio falling within the range defined in formula (1) given below, and a nonaqueous electrolyte. The lithium-absorbing material has a lithium absorption potential nobler than a lithium absorption potential of the lithium-titanium composite oxide.3&#x2266;()&#x2266;100&#x2003;&#x2003;(1) Where A denotes the weight (parts by weight) of the lithium-titanium composite oxide, and B denotes the weight (parts by weight) of the lithium-absorbing material.

Growing community of inventors

Ichikawa, Japan

Hideaki Morishima