LITHIUM SECONDARY BATTERY, ELECTROLYTE SOLUTION FOR LITHIUM SECONDARY BATTERY, AND ADDITIVE FOR ELECTROLYTE SOLUTION THEREFOR

摘要

Provided are a lithium secondary battery having improved initial capacity and excellent cycle property, an electrolyte solution for the lithium secondary battery, and an additive for the electrolyte solution for the lithium secondary battery. The lithium secondary battery includes positive and negative electrodes both having a lithium-ion intercalation/de-intercalation ability, and a non-aqueous electrolyte solution contacted with the positive and negative electrodes. The non-aqueous electrolyte solution contains lithium hexafluorophosphate and a boroxine compound represented by (RO)3(BO)3 liquefying at 25° C. R(s) each independently represent an organic group of a linear chain alkyl group having 3 or more carbon atoms. Herein, the chain alkyl group may have a branch, and when the branch is included, the number of carbon atoms of the chain alkyl group constructing a linear portion thereof is 3 or more.

主权项

1. A lithium secondary battery comprising:
a positive electrode having a lithium-ion intercalation/de-intercalation ability; a negative electrode having a lithium-ion intercalation/de-intercalation ability; and a non-aqueous electrolyte solution contacted with the positive electrode and the negative electrode, wherein the non-aqueous electrolyte solution contains lithium hexafluorophosphate and a boroxine compound liquefying at 25° C. represented by Formula (1): where R(s) each represent independently an organic group of a linear chain alkyl group having 3 and more carbon atoms; the chain alkyl group optionally has a branch; and when the chain alkyl group has the branch, the number of the carbon atoms of the chain alkyl group constructing a linear portion thereof is 3 or more.