Negative electrode active material for nonaqueous electrolyte battery, nonaqueous electrolyte battery, battery pack, and vehicle

A nonaqueous electrolyte battery comprising:

• a negative electrode comprising a negative electrode active material;
• a positive electrode;
• a nonaqueous electrolyte interposed between the negative electrode and positive electrode;
• and
• a battery container which accommodates the negative electrode, the positive electrode, and the nonaqueous electrolyte,
• wherein the negative electrode active material comprises a metal-displaced lithium-titanium oxide of a ramsdellite structure expressed by the formula (1):
• Li(16/7)-xTi(24/7)-yMyO8 (1)
• where M is at least one metal element selected from the group consisting of Nb, Ta, Mo, and W, and x and y are respectively numbers in the range of 0<x<16/7 and 0<y<24/7.

A battery pack comprising:

• a battery module comprising a plurality of nonaqueous electrolyte batteries connected in series;
• and
• a pack container which accommodates the battery module,
• wherein the nonaqueous electrolyte batteries comprise:
• a negative electrode active material comprising a metal-displaced lithium-titanium oxide of a ramsdellite structure expressed by the formula (1):
• Li(16/7)-xTi(24/7)-yMyO8 (1)
• where M is at least one metal element selected from the group consisting of Nb, Ta, Mo, and W, and x and y are respectively numbers in the range of 0<x<16/7 and 0<y<24/7;
• a negative electrode comprising the negative electrode active material;
• a positive electrode;
• a nonaqueous electrolyte interposed between the negative electrode and positive electrode;
• and
• a battery container which accommodates the negative electrode, the positive electrode, and the nonaqueous electrolyte.

A vehicle comprising:

• an internal combustion engine;
• a motor;
• wheels driven by at least one of the internal combustion engine and the motor;
• a battery pack which supplies electricity to the motor;
• and a generator which charges the battery pack by supplying electric power generated by a rotating force of the wheels to the battery pack,
• wherein the battery pack comprises:
• a battery module comprising a plurality of nonaqueous electrolyte batteries connected in series;
• and
• a pack container which accommodates the battery module, and
• the nonaqueous electrolyte batteries comprise:
• a negative electrode active material comprising a metal-displaced lithium-titanium oxide of a ramsdellite structure expressed by the formula (1):
• Li(16/7)-xTi(24/7)-yMyO8 (1)
• where M is at least one metal element selected from the group consisting of Nb, Ta, Mo, and W, and x and y are respectively numbers in the range of 0<x<16/7 and 0<y<24/7;
• a negative electrode comprising the negative electrode active material;
• a positive electrode;
• a nonaqueous electrolyte interposed between the negative electrode and positive electrode;
• and
• a battery container which accommodates the negative electrode, the positive electrode, and the nonaqueous electrolyte.