Kabushiki Kaisha Toshiba

Kazuya Kuriyama

Hidesato Saruwatari

Dai Yamamoto

Hideki Satake

Masanori Tanaka

Hikaru Yoshikawa

Tetsuro Kano

Shinsuke Matsuno

Yuki Watanabe

Hirotaka Hayashida

Hiroki Inagaki

Yoshinao Tatebayashi

Hiromichi Kuriyama

Haruchika Ishii

Kengo Kurata

Masataka Shikota

Hiroko Watando

Sayaka Morimoto

Toshihide Arikawa

Hirotada Tahara

Yuichi Kikuma

According to one embodiment, there is provided a nonaqueous electrolyte battery including a positive electrode. The positive electrode includes a positive electrode active material-containing layer. The positive electrode active material-containing layer includes at least one lithium-nickel composite oxide and a conductive agent. The positive electrode active material-containing layer has, in a particle size distribution obtained by a laser diffraction scattering method, an average particle diameter dwithin a range of 1 &#x3bc;m to 5.5 &#x3bc;m, a maximum particle diameter within a range of 10 &#x3bc;m to 100 &#x3bc;m, a particle diameter dwithin a range of 0.5 &#x3bc;m to 3 &#x3bc;m, and X, represented by X=(d&#x2212;d)/d, within a range of 0.5 to less than 1.

Nonaqueous electrolyte battery

According to an embodiment, there is provided a battery system. The battery system includes a first battery and a second battery connected in parallel with the first battery. The first battery includes a lead storage battery. The second battery includes a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a positive electrode and a negative electrode. The negative electrode includes a negative-electrode-mixture layer, and the negative-electrode-mixture layer contains lithium titanate. The positive electrode contains a positive electrode active material LiMnM(a)O. A ratio of a battery capacity of the second battery to a battery capacity of the first battery is in a range of 1/133 to 1/2.

Battery system

According to one embodiment, there is provided a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a positive electrode, a negative electrode and a nonaqueous electrolyte. The negative electrode includes a negative electrode material layer. The negative electrode material layer includes a negative electrode active material capable of absorbing and releasing lithium at a potential of 0.78 V (vs. Li/Li) or more. A film containing a compound having a propylene glycol backbone is formed on at least a part of a surface of the negative electrode material layer. A content of the compound having the propylene glycol backbone in the film is 2 &#x3bc;mol to 40 &#x3bc;mol per g of a weight of the negative electrode material layer.

A nonaqueous electrolyte secondary battery according to an embodiment includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The negative electrode contains a negative electrode active material. A lithium insertion-extraction reaction potential of a negative electrode active material is higher than the oxidation-reduction potential of lithium by a value of 1 V or more. The nonaqueous electrolyte contains an electrolytic salt, a nonaqueous solvent, at least one hydroxyalkylsulfonic acid, and at least one sulfonate.

Nonaqueous electrolyte secondary battery and battery pack

A non-aqueous electrolyte secondary battery of an embodiment includes an exterior member, a negative electrode containing a titanium-containing oxide housed in the exterior member, a positive electrode housed in the exterior member, a separator housed in the exterior member and arranged between the positive electrode and the negative electrode, and a non-aqueous electrolyte solution housed in the exterior member. At least one type or more chain carbonates are contained in a solvent of the non-aqueous electrolyte solution. A self-diffusion coefficient of the chain carbonate in &#x2212;20&#xb0; C. is front 1.4&#xd7;10to 2.0&#xd7;10m/sec.

Non-aqueous electrolyte secondary battery and battery pack

According to one embodiment, there is provided a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes a positive current collector and a positive electrode material layer formed on the positive electrode current collector. The positive electrode material layer includes a positive electrode active material and a first conductive agent. In a mapping image for the positive electrode material layer, a ratio of an occupancy area of the first conductive agent to an occupancy area of the positive electrode active material is from 1.5 to 5.

According to one embodiment, there is provided a nonaqueous electrolyte secondary battery including a positive electrode, a negative electrode containing a titanium-containing oxide, and a nonaqueous electrolyte. The nonaqueous electrolyte contains carbon monoxide and at least one selected from difluorophosphoric acid and monofluorophosphoric acid. The ratio of the mass concentration of carbon monoxide to the sum of the mass concentrations of difluorophosphoric acid and monofluorophosphoric acid is in the range of 0.1 to 5%.

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Saku, Japan

Kazuya Kuriyama