Kabushiki Kaisha Toshiba

Toshiba Infrastructure Systems & Solutions Corporation

Ryo Hara

Dai Yamamoto

Keigo Hoshina

Norio Takami

Yasuhiro Harada

Kazuhiro Namba

According to one embodiment, provided is a nonaqueous electrolyte battery including a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes lithium manganese composite oxide particles having a spinel crystal structure and lithium cobalt composite oxide particles. The negative electrode includes a titanium-containing oxide. The nonaqueous electrolyte contains a propionate ester. The battery satisfies 0.8&#x2264;p/n&#x2264;1.2 and 1&#x2264;w/s&#x2264;60. p denotes a capacity per unit area of the positive electrode. n denotes a capacity per unit area of the negative electrode. w denotes a content of the propionate ester in the nonaqueous electrolyte and is in a range of 10% by weight to 60% by weight. s denotes an average particle size of the lithium manganese composite oxide particles.

Nonaqueous electrolyte battery and battery pack

According to one embodiment, provided is a nonaqueous electrolyte battery including a positive electrode, a negative electrode, and a nonaqueous electrolyte. The negative electrode contains a negative electrode active material containing orthorhombic Na-containing niobium-titanium composite oxide particles represented by general formula (1) LiNaM1TiNbM2O. In general formula (1), M1 is one or two or more elements selected from the group consisting of Cs, K, Sr, Ba, and Ca, M2 is one or two or more elements selected from the group consisting of Zr, Al, Sn, V, Ta, Mo, W, Fe, Co, and Mn, 0&#x2264;v&#x3c;2, 0&#x2264;x&#x3c;2, 0&#x3c;y&#x3c;2, 0&#x2264;z&#x3c;3, and &#x2212;0.5&#x2264;&#x3b4;&#x2264;0.5. The nonaqueous electrolyte contains an Na component in a range of 10 ppm by mass to 3,000 ppm by mass.

A nonaqueous electrolyte battery according to one embodiment includes a negative electrode, a positive electrode and a nonaqueous electrolyte. The negative electrode includes a negative electrode active material-containing layer. The negative electrode active material-containing layer contains a negative electrode active material containing an orthorhombic Na-containing niobium titanium composite oxide. The positive electrode includes a positive electrode active material-containing layer. The positive electrode active material-containing layer contains a positive electrode active material. A mass C [g/m] of the positive electrode active material per unit area of the positive electrode and a mass A [g/m] of the negative electrode active material per unit area of the negative electrode satisfy the formula (1): 0.95&#x2264;A/C&#x2264;1.5.

According to one embodiment, provided is a nonaqueous electrolyte battery including a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes a spinel type lithium-manganese composite oxide and a lithium cobalt oxide, which satisfy formula (1): 0.01&#x2264;B/(A+B)&#x3c;0.05. The negative electrode includes a titanium-containing oxide. The nonaqueous electrolyte battery satisfies formula (2): 0.3&#x2264;C/D 0.8. A is a weight ratio (wt %) of the spinel type lithium-manganese composite oxide. B is a weight ratio (wt %) of the lithium cobalt oxide. C is a pore specific surface area (m/g) of the positive electrode. D is a pore specific surface area (m/g) of the negative electrode.

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Kashiwazaki, Japan

Ryo Hara