Nonaqueous electrolyte battery and battery pack

摘要

According to one embodiment, a nonaqueous electrolyte battery includes a nonaqueous electrolyte, a positive electrode, a negative electrode and a separator. The nonaqueous electrolyte includes an asymmetric sulfone-based compound and a symmetric sulfone-based compound. The positive electrode includes a composite oxide represented by Li1−xMn1.5−yNi0.5−zMy+zO4 (0≦x≦1, 0≦y+z≦0.15, and M is at least one kind of element selected from the group consisting of Mg, Al, Ti, Fe, Co, Ni, Cu, Zn, Ga, Nb, Sn, Zr and Ta). The negative electrode includes a Ti-containing oxide which is capable of absorbing and releasing lithium. The separator includes a nonwoven fabric.

主权项

1. A nonaqueous electrolyte battery comprising:
a nonaqueous electrolyte comprising a nonaqueous solvent comprising an asymmetric sulfone-based compound represented by Formula 1 and a symmetric sulfone-based compound represented by Formula 2, and a lithium salt which is dissolved in the nonaqueous solvent; a positive electrode comprising a positive electrode active material comprising a composite oxide represented by Li1−xMn1.5−yNi0.5−zMy+zO4 (0≦x≦1, 0≦y+z≦0.15, and M is at least one kind of element selected from the group consisting of Mg, Al, Ti, Fe, Co, Ni, Cu, Zn, Ga, Nb, Sn, Zr and Ta); a negative electrode comprising a negative electrode active material comprising at least one of a spinel type lithium titanate and a monoclinic system titanium dioxide; and a separator comprising a nonwoven fabric which is provided between the positive electrode and the negative electrode wherein R1≠R2, and R1 and R2 are each an alkyl group having 1 to 10 carbon atoms, and R3 is an alkyl group having 1 to 6 carbon atoms.