Lg Chem, Ltd

Sk on Co., Ltd.

You Jin Shim

Byoung Bae Lee

Jae Seung Oh

Yeon Suk Hong

Hyo Jin Lee

Yu Na Shim

Min Ah Kim

The present disclosure relates to an electrolytic solution for a secondary battery and a lithium secondary battery employing the same. The electrolytic solution for a secondary battery of the present disclosure contains a sulfonyl compound, such that a lithium secondary battery employing a high content of nickel for a cathode has significantly improved quick charge characteristics, room temperature lifespan characteristics, and low-temperature characteristics.

Electrolytic solution for secondary battery and lithium secondary battery including the same

A non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery including the same are provided. The non-aqueous electrolyte solution includes an organic solvent, an ionizable lithium salt, a dinitrile compound including an ether bond represented by Chemical Formula 1, and an aliphatic dinitrile compound represented by Chemical Formula 2. The lithium secondary battery including the non-aqueous electrolyte solution having the possibility of generating a swelling phenomenon while storing or charging/discharging at a high temperature may be restrained. In addition, a cycle life of the charging/discharging may be improved.

Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

A lithium secondary battery comprising a positive electrode, a negative electrode, a separator inserted between the positive electrode and the negative electrode and a non-aqueous electrolyte is provided. The positive electrode comprises a first positive electrode active material represented by following Chemical Formula 1. And the non-aqueous electrolyte comprises a first lithium salt, a second lithium salt represented by following Chemical Formula 2 and a non-aqueous organic solvent.LiMO&#x2003;&#x2003;[Chemical Formula 1]LiRCOO&#x2003;&#x2003;[Chemical Formula 2] (In Chemical Formulae 1 and 2, M=NiMnCo, in which 0&#x3c;a&#x3c;2, 0&#x3c;b&#x3c;2, 0&#x3c;c&#x3c;2, a+b+c=1 or 2, 0.5&#x2266;x&#x2266;1.3, 1&#x3c;x+y&#x2266;3.3, 2&#x2266;z&#x2266;4, and R is independently a C-Calkyl group, a C-Caryl group, a C-Calkenyl group, a halogen substituted C-Calkyl group, a halogen substituted C-Caryl group or a halogen substituted C-Calkenyl group).

Lithium secondary battery

A non-aqueous electrolyte solution includes an electrolyte solution including an amide compound and a lithium salt, and a dinitrile compound substituted by a hetero atom at a main chain, and a lithium secondary battery includes the non-aqueous electrolyte solution. By using the non-aqueous electrolyte solution, a lithium secondary battery having an improved swelling phenomenon and an increased charging/discharging performance may be provided.

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Daejeon, South Korea

You Jin Shim