Electrolytic solution and battery
A secondary battery capable of improving high-temperature characteristics is provided. The secondary battery includes a cathode, an anode and an electrolytic solution. A separator provided between the cathode and the anode is impregnated with the electrolytic solution. A solvent of the electrolytic solution includes a main solvent such as a cyclic carbonate which includes halogen and a sub solvent such as carbonate dimer.
1. A secondary battery comprising:
a cathode;
an anode including an anode active material, wherein the anode active material includes a carbon material;
an electrolytic solution including a solvent and an electrolyte salt;
wherein the solvent includes a first solvent and a second solvent, and the solvent does not include a trialkyl phosphate;
wherein the first solvent includes 4-fluoro-1,3-dioxolane-2-one; and
wherein the second solvent includes Chemical Formula No. 23 represented below:
and an amount of Chemical Formula No. 23 in the solvent ranges from 0.1 wt % to 1 wt %.
2. The secondary battery according to claim 1 , wherein the solvent of the electrolytic solution further includes at least one of ethylene carbonate, dimethyl carbonate, a vinylene carbonate compound, vinylene carbonate, a vinyl ethylene carbonate compound, a methylene ethylene carbonate compound, a sultone, propene sultone, an acid anhydride, succinic anhydride, or sulfobenzoic anhydride.
3. The secondary battery according to claim 1 , wherein the cathode includes a cathode active material including a lithium-cobalt complex oxide.
4. The secondary battery according to claim 1 , wherein the electrolyte salt includes lithium hexafluorophosphate.
5. The secondary battery according to claim 1 , wherein the carbon material includes graphite.
6. The secondary battery according to claim 1 , wherein the anode includes an anode current collector, and wherein the anode active material is provided on the anode current collector.
7. The secondary battery according to claim 1 , wherein the secondary battery is a lithium ion secondary battery.