Electrolyte for secondary battery and lithium secondary battery including the same

摘要

Disclosed are an electrolyte for a lithium secondary battery which includes a non-aqueous solvent and a lithium salt, wherein the non-aqueous solvent includes a cyclic carbonate and a linear solvent, wherein an amount of the cyclic carbonate in the non-aqueous solvent is in the range of 1 wt % to 30 wt % based on a total weight of the non-aqueous solvent and a lithium secondary battery including the same.

主权项

1. A lithium secondary battery comprising an electrolyte and an electrode assembly comprising a cathode, an anode, and a polymer membrane disposed between the cathode and the anode, the electrode assembly being accommodated in a battery case,
wherein the cathode comprises a spinel-structure lithium metal oxide represented by Formula (2) below:
LixNiyMn2−yO4  (2) wherein 0.9≦x≦1.2 and 0.4≦y≦0.5, the anode comprises a lithium metal oxide represented by Formula (4) below:
LiaTibO4  (4) wherein 0.5≦a≦3 and 1≦b≦2.5, and, wherein the electrolyte comprises a non-aqueous solvent and a lithium salt, in which the non-aqueous solvent comprises a cyclic carbonate and a linear solvent, wherein an amount of the cyclic carbonate in the non-aqueous solvent is in a range of 1 wt % to 30 wt % based on a total weight of the non-aqueous solvent, and wherein an amount of the linear solvent in the non-aqueous solvent is in a range of 70 wt % to 99 wt % based upon the total weight of the non-aqueous solvent, wherein the linear solvent is a linear carbonate, wherein the linear carbonate is dimethyl carbonate (DMC), and wherein the cyclic carbonate is ethylene carbonate (EC).