| 主权项 |
1. A battery pack for use in a hybrid electric vehicle comprising a plurality of lithium secondary cells connected in series, in parallel, or in a combination thereof, wherein each cell comprises:
a positive electrode including a lithium transition metal phosphate compound a negative electrode including carbon; an electrolyte in contact with and separating the positive electrode and negative electrode, wherein the electrolyte includes about 0.8 M to about 1.5 M LiPF6 and an organic solvent including about 30 wt % to about 70 wt % ethylene carbonate, about 0 wt % to about 20 wt % propylene carbonate, about 0 wt % to about 60 wt % dimethyl carbonate, about 0 wt % to about 60 wt % ethyl methyl carbonate, about 0 wt % to about 60 wt % diethyl carbonate, and about 0 wt % to about 5 wt % vinylene carbonate, wherein the sum of the weight percents of ethylene carbonate and propylene carbonate is between about 30 wt % and about 70 wt % of the total organic solvent, and propylene carbonate represents about 30 wt % or less of the sum; a positive electrode current collector in electronic communication with the positive electrode; and a negative electrode current collector in electronic communication with the negative electrode. |
