Electrolyte composition, lithium battery using the same, and method of manufacturing the lithium battery
View Patent ↗An electrolyte composition, a lithium battery using the electrolyte composition, and a method of manufacturing the lithium battery are provided. The electrolyte composition contains: a lithium salt; an organic solvent containing 15-50% by weight of propylene carbonate based on the total weight of the electrolyte composition; a nitrogen-containing compound; and cyclohexylbenzene. The lithium battery manufactured using the electrolyte composition has improved stability even when overcharged and improved cycle characteristics.
1. An electrolyte composition comprising:
a lithium salt;
an organic solvent containing 15-50% by weight of propylene carbonate based on the total weight of the electrolyte composition;
a nitrogen-containing compound selected from the group consisting of monomers, polymers, copolymers and oligomers of pyridine; and
cyclohexylbenzene;
the nitrogen-containing compound serving to suppress earlier oxidation polymerization of the cyclohexylbenzene.
2. The electrolyte composition of claim 1 , wherein the amount of the nitrogen-containing compound ranges from 0.1% to 5% by weight and the amount of the cyclohexylbenzene ranges from 0.5% to 10% by weight based on the total weight of the composition.
3. The electrolyte composition of claim 1 , wherein the nitrogen-containing compound is poly (2-vinylpyddine-co-styrene.
4. The electrolyte composition of claim 1 further comprising at least one compound selected from the group consisting of an epoxy-containing compound and vinylene carbonate.
5. The electrolyte composition of claim 4 , wherein the amount of the epoxy-containing compound ranges from 0.02% to 1.5% by weight based on the total weight of the electrolyte composition.
6. The electrolyte composition of claim 1 , wherein the lithium salt is selected from the group consisting of LiPF 6 , LiAsF 6 , LiClO 4 , LiN(CF 3 SO 2 ) 2 , LiBF 4 , LiCF 3 SO 3 , and LiSbF 6 , and the concentration of the lithium salt in the organic solvent ranges from 0.5M to 2.0M.
7. A method of manufacturing a lithium battery, the method comprising:
injecting the electrolyte composition of claim 1 into a battery container in which an anode, a cathode, and a separator are contained; and
sealing the battery container.
8. The method of claim 7 further comprising heating the container at a temperature of 30-130° C. after the sealing to gelate the electrolyte composition.
9. A lithium battery manufactured according to the method of claim 7 .
10. The lithium battery of claim 9 comprising a gel polymer electrolyte between the anode and the cathode, the gel polymer electrolyte being obtained by gelating the electrolyte composition.
11. A lithium battery containing the electrolyte composition of claim 1 .