Secondary battery including electrolyte additive
View Patent ↗Disclosed is a secondary battery including an electrode assembly, which includes a cathode, an anode and a separator interposed therebetween, and an electrolyte, wherein the anode includes lithium titanium oxide (LTO) as an anode active material and the electrolyte contains a phosphate-based compound as an additive.
1. A secondary battery comprising an electrode assembly comprising a cathode, an anode and a separator interposed therebetween, and an electrolyte,
wherein the anode comprises lithium titanium oxide (LTO) as an anode active material, and
the electrolyte is a liquid electrolyte, which contains a phosphate-based compound as an additive, wherein the phosphate-based compound comprises at least one selected from the group consisting of a phosphate-based acrylate of Formula (1), a pyrophosphate-based acrylate of Formula (2) and a phosphate-based urethane acrylate:
where R 1 and R 2 are each independently hydrogen, methyl or F, and n is an integer of 1 to 20.
2. The secondary battery according to claim 1 , wherein the electrolyte contains 0.01 to 30% by weight of the phosphate-based compound based on the total weight of the electrolyte.
3. The secondary battery according to claim 1 , wherein the liquid electrolyte comprises an electrolyte serving as a plasticizer and a lithium salt.
4. The secondary battery according to claim 3 , wherein the electrolyte contains 0.01 to 30% by weight of the lithium salt based on the total weight of solid components included in the electrolyte.
5. A battery module comprising the secondary battery according to claim 1 as a unit cell.
6. A battery pack comprising the battery module according to claim 5 .
7. A device comprising the battery pack according to claim 6 .
8. The device according to claim 7 , wherein the device is an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle or a power storage system.