Electrolyte solution, lithium secondary battery and method for improving performance of 4.55V high-voltage lithium cobalt oxide cathode battery system
The invention belongs to the field of new energy, and discloses an electrolyte suitable for a 4.55V high-voltage lithium cobalt oxide positive electrode battery system, including lithium salt, non-aqueous organic solvent, a first additive, and a second additive; the first additive is Tris(2‑cyanoethyl) borate. The electrolyte contains a first additive and a second additive, the first additive and the second additive are film-forming aids, mainly used for positive electrode film formation, and the first additive contains boron atoms, which have lone pair electrons and oxygen in the positive electrode. Combination to prevent oxygen precipitation, and it also contains three cyano groups, which can be combined with positive cobalt; the second additive contains four cyano groups, which enhance the binding effect of the first additive and positive cobalt, and better prevent the dissolution of cobalt; at the same time The strength of the composite film formed by the first additive and the second additive is better than that of existing combinations of other additives, and the electrical performance can be effectively improved. At the same time, the invention also discloses a lithium secondary battery and a method for improving the performance of the 4.55V high-voltage lithium cobalt oxide positive electrode battery system.
It relates to a lithium secondary battery, which includes a positive electrode and a negative electrode, a planarization additive having a reduction potential of -0.5V or more and less than 0.9V, and an electrolyte including a non-aqueous solvent.
리튬 이차 전지에 관한 것으로서, 상기 전지는 양극 음극 및 환원 전위가 -0.5V 이상, 0.9V 미만인 평탄화 첨가제 및 비수계 용매를 포함하는 전해질을 포함한다.
SAMSUNG SDI CO LTD [KR] (삼성에스디아이 주식회사)
KANG YOON SOK (강윤석)
KA BOKHYUN (가복현)
RYU JI HYUN (류지현)
SON JI HOON (손지훈)
HWANG TAEHYUN (황태현)
Electrolyte Solution And Secondary Battery Comprising The Same
전해액 및 이를 포함하는 이차전지
The present invention relates to an electrolyte solution and a secondary battery including the same. According to the present invention, a secondary battery capable of improving charging efficiency and output due to low discharge resistance and having long lifespan and high-temperature capacity retention rate by suppressing gas generation and thickness increase. There is an effect of providing a battery.
본 발명은 전해액 및 이를 포함하는 이차전지에 관한 것으로, 본 발명에 따르면, 방전 저항이 낮아 충전 효율 및 출력이 향상될 수 있고, 가스발생 및 두께 증가를 억제하여 장기 수명 및 고온 용량 유지율이 우수한 이차전지를 제공하는 효과가 있다.
SOULBRAIN CO LTD [KR] (솔브레인 주식회사)
KIM MIN GOO (김민구)
JANG MIN JUNG (장민정)
KIM JAE YOON (김재윤)
LEE SANG HO (이상호)
YUN JONG CHEOL (윤종철)
HAN JI SEONG (한지성)
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