Electrolyte solution for lithium secondary battery and lithium secondary battery including same

A lithium secondary battery comprising:

• a first electrode;
• a second electrode;
• and
• an electrolyte solution disposed between the first electrode and the second electrode, the electrolyte solution comprising:
• a lithium salt;
• a solvent;
• and
• a functional additive, wherein the functional additive comprises 4-((tert-butoxydimethylsilyl)methyl)-5-methyl-1,3-dioxol-2-one represented by
• as an electrode film additive.

A lithium secondary battery comprising:

• a positive electrode comprising a positive electrode active material comprising Ni, Co, and Mn;
• a negative electrode comprising a carbon-based negative electrode active material or a silicon-based negative electrode active material;
• a separator interposed between the positive electrode and the negative electrode;
• and
• an electrolyte solution disposed between the positive electrode and the negative electrode, the electrolyte solution comprising:
• a lithium salt;
• a solvent;
• and
• a functional additive, wherein the functional additive comprises 4-((tert-butoxydimethylsilyl)methyl)-5-methyl-1,3-dioxol-2-one represented by
• as an electrode film additive.