Kabushiki Kaisha Toshiba

Kabushiki Kaihsa Toshiba

Hiromichi Kuriyama

Hidesato Saruwatari

Dai Yamamoto

Hideki Satake

Shinsuke Matsuno

Takashi Kuboki

Norio Takami

Yuki Watanabe

Hikaru Yoshikawa

Asato Kondo

Tetsuro Kano

Yasuaki Murashi

Naoki Nishio

Kazuya Kuriyama

According to one embodiment, there is provided a non-aqueous electrolyte secondary battery including a positive electrode including a positive electrode active material layer, a negative electrode including a negative electrode active material layer, and a non-aqueous electrolyte. At least one of the positive electrode active material layer and the negative electrode active material layer contains carbon dioxide and releases the carbon dioxide in the range of 0.1 ml to 10 ml per 1 g when heated at 350&#xb0; C. for 1 minute.

Non-aqueous electrolyte secondary battery

According to one embodiment, there is provided a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode including a negative electrode active material layer, and a non-aqueous electrolyte. The negative electrode active material layer contains carbon dioxide and releases the carbon dioxide in the range of 0.1 ml to 5 ml per 1 g when heated at 200&#xb0; C. for 1 minute.

Non-aqueous electrolyte secondary battery and production method thereof

According to an embodiment, a nonaqueous electrolyte battery is provided. The nonaqueous electrolyte includes a negative electrode, a positive electrode and a nonaqueous electrolyte. The negative electrode includes negative electrode active material particles. The negative electrode active material particles include a spinel-type lithium titanate. The negative electrode has such a surface state that a ratio A/Aof an Li atom abundance ratio Ato a Ti atom abundance ratio A, according to a photoelectron spectroscopic measurement for a surface, is increased at a rate of 0.002 to 0.02 per cycle in a charge-and-discharge cycle test under the predetermined condition.

Nonaqueous electrolyte battery

According to one embodiment, an electrode is provided. The electrode includes an electrode mixture layer and a current collector. The electrode mixture layer contains active material particles. The electrode mixture layer includes a first surface being in contact with the current collector and a second surface separated from the first surface by a thickness of the electrode mixture layer. The electrode mixture layer includes a first portion having the first surface and a second portion having the second surface. In the first portion, a first oxide layer is formed on the active material particle. In the second portion, a second oxide layer is formed on the active material particles. The thickness of the first oxide layer is more than the thickness of the second oxide layer.

Electrode and nonaqueous electrolyte battery

According to one embodiment, a nonaqueous electrolyte battery including a positive electrode, a negative electrode, and a nonaqueous electrolyte is provided. The positive electrode includes an active material including LiMnAlMO(&#x2212;0.1&#x2264;x&#x2264;1, 0.20&#x2264;y&#x2264;0.35, 0&#x2264;z&#x2264;0.1, M is at least one metal selected from Mg, Ca, Ti, V, Cr, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, and Sn). The negative electrode includes an active material including a first oxide represented by LiTiO(&#x2212;0.5&#x2264;a&#x2264;3) and a second oxide of at least one element selected from Al, Co, Cr, Cu, Fe, Mg, Ni, Zn, and Zr. The second oxide is included in an amount of from 300 ppm to 5000 ppm relative to a weight of the first oxide.

Nonaqueous electrolyte battery and battery pack

The nonaqueous electrolyte battery according to one embodiment includes a positive electrode and a negative electrode. The positive electrode contains a positive electrode active material containing manganese-containing composite oxide. The negative electrode contains a negative electrode active material selected from the group consisting of titanium oxide and titanium-containing composite oxide. A ratio p/n of a capacity p per unit area of the positive electrode to a capacity n per unit area of the negative electrode is in the range of 0.8 or more and 1 or less.

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

According to one embodiment, there is provided a positive electrode including a positive electrode active material-including layer including a positive electrode active material, which includes a lithium-manganese oxide LiMnMO, and a conductive agent. In the positive electrode active material-including layer, an average particle diameter dis within 2 &#x3bc;m to 5 &#x3bc;m, a particle diameter dand a particle diameter d, where a cumulative frequency from a smaller side is, respectively, 10% and 90%, is within 0.5 &#x3bc;m to 3 &#x3bc;m and within 4 &#x3bc;m to 10 &#x3bc;m, respectively, in a particle size distribution. X, represented by X=(d&#x2212;d) /dis within 0.4 to 0.8. Y, represented by Y=(d&#x2212;d)/dis within 0.2 to 0.6.

Positive electrode and nonaqueous electrolyte battery

According to one embodiment, there is provided a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a negative electrode, a positive electrode, and a nonaqueous electrolyte. An Li-atom abundance ratio A, Ti-atom abundance ratio A, and C-atom abundance ratio Aof a surface of the negative electrode satisfy inequalities 2&#x2266;A/A&#x2266;10, and 1.0&#x2266;A/A&#x2266;1.5. The positive electrode includes a nickel-cobalt-manganese composite oxide represented by a composition formula LiNiCoMnO. Subscripts x, y, and z satisfy an inequality 0.1&#x2266;x/(y+z)&#x2266;1.3, and subscript a satisfies an inequality 0&#x2266;a&#x2266;1. A ratio p/n of a capacity p of the positive electrode to a capacity n of the negative electrode is within a range of 1.2 to 2.

According to one embodiment, there is provided a nonaqueous electrolyte battery. The nonaqueous electrolyte battery includes a negative electrode, a positive electrode, and a nonaqueous electrolyte. The negative electrode includes an oxide of titanium. The positive electrode includes a positive electrode current collector including aluminum, a positive electrode layer including a nickel-cobalt-manganese composite oxide including lithium, and a passive film formed on the positive electrode current collector. A ratio p/n of a capacity p of the positive electrode to a capacity n of the negative electrode falls within the range from 1.1 to 1.8.

According to one embodiment, a nonaqueous electrolyte battery includes a container, a positive electrode, and a negative electrode. The container satisfies Formula (1) of 0.15&#x2266;(Tmin/Tmax)&#x2266;1. The positive electrode includes a positive electrode active material represented by the composition formula LiNiCoMnO. The negative electrode includes a spinel type lithium titanium oxide. A nominal capacity of the nonaqueous electrolyte battery is in a range of from 5 Ah to 200 Ah. When a state of charge based on the nominal capacity is 50%, an open circuit voltage is in a range of from 2.12 V to 2.24 V.

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Yokkaichi, Japan

Hiromichi Kuriyama