Patent ID: 7029793

Claim:
A nonaqueous electrolyte lithium secondary cell comprising a nonaqueous electrolyte containing a lithium salt, a positive electrode, a negative electrode and a separator wherein, a material which contains a room temperature molten salt as a main component and is in liquid-state, is provided as the nonaqueous electrolyte, the negative electrode contains a negative active material wherein a working potential of the negative electrode is nobler by above 1V than a potential of a metallic lithium, the positive electrode contains a positive active material wherein a working potential of the positive electrode is nobler by above 4.5V than a potential of the metallic lithium, wherein the main component of the positive active material comprises a burnt oxide having the spinel type structure expressed by Li m [Ni 2−n M n O 4 ] (M is a transition metal of one or more kinds and an element other than Ni, 0≦m≦1.1, 0.75≦n≦1.80), and the foregoing liquid-state nonaqueous electrolyte is contained in the positive electrode, the negative electrode and the separator.