Electrolyte solution for lithium secondary battery and Lithium secondary battery comprising the same

• Main Authors: LEE JEONG WOO, LEE YOON SUNG, CHOI NAM SOON, KIM KO EUN, MOON HYEON GYU, HONG SUNG YOU, BAN SUNG HO, RHEE JUN KI, NAM HUI BEOM
• Format: Patent
• Language: English; Korean
• Published: 23.05.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

본 발명은 고용량 리튬 이차전지의 수명특성 및 출력특성을 향상시킬 수 있는 리튬 이차전지용 전해액 및 이를 포함하는 리튬 이차전지에 관한 것이다. 본 발명의 일 실시형태에 따른 리튬 이차전지용 전해액은 리튬염, 용매 및 기능성 첨가제로 이루어지는 리튬 이차전지용 전해액으로서, 상기 기능성 첨가제는 하기의 [식 1]로 표현되는 2-(dodec-1-en-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane인 전극피막 첨가제를 포함하는 것을 특징으로 한다. JPEGpat00004.jpg48111... [식 1] An embodiment electrolyte solution includes a lithium salt, a solvent, and a functional additive, wherein the functional additive includes an electrode film additive of 2-(dodec-1-en-2-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane represented byAn embodiment lithium secondary battery includes this electrolyte solution, a positive electrode including a positive-electrode active material including Ni, Co, and Mn, a negative electrode including a negative-electrode active material including a carbon (C)-based material or a silicon (Si)-based material, and a separator interposed between the positive electrode and the negative electrode.