Additives for non-aqueous electrolyte and secondary battery using the same
First Claim
1. An electrolyte for a secondary battery comprising:
- (a) an electrolyte salt;
(b) an electrolyte solvent comprising fluoroethylene carbonate, propylene carbonate and dimethyl carbonate; and
(c) a compound generating heat through oxidation at voltages higher than drive voltage of a cathode,wherein the compound is 5,6,7,8-tetrafluorobenzo-1,4-dioxane, andwherein the compound decomposes or evaporates electrolyte components by oxidation heat, thereby causing generation of gas.
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Abstract
Disclosed are an electrolyte for a secondary battery, and a secondary battery including the same, the electrolyte including an electrolyte salt; an electrolyte solvent; and a compound generating heat through oxidation at voltages higher than drive voltage of a cathode, wherein the compound can decompose or evaporate electrolyte components by oxidation heat, thereby causing gas generation. Also, the compound is included in an internal pressure increase accelerant for a battery. Upon overcharge, since a compound subjected to oxidation at voltages higher than normal drive voltage of a cathode generates heat, electrolyte components can be decomposed or evaporated, thereby generating gas by the oxidation heat. Accordingly, it is possible to operate a safety means of a battery, without using an internal pressure increasing material directly generating gas through oxidation at overcharge voltage as the electrolyte additive, and thus to improve the overcharge safety of a secondary battery.
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Citations
9 Claims
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1. An electrolyte for a secondary battery comprising:
- (a) an electrolyte salt;
(b) an electrolyte solvent comprising fluoroethylene carbonate, propylene carbonate and dimethyl carbonate; and
(c) a compound generating heat through oxidation at voltages higher than drive voltage of a cathode,wherein the compound is 5,6,7,8-tetrafluorobenzo-1,4-dioxane, and wherein the compound decomposes or evaporates electrolyte components by oxidation heat, thereby causing generation of gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- (a) an electrolyte salt;
Specification