Samsung Sdi Co., Inc.

Tae Hwan Yu

Jin Hee Kim

Jong Ho Jeon

Sung Nim Jo

Jung Joo Cho

Joo Hwan Koh

Se Won Kim

Jae Ha Shim

Jin Ah Seo

Jong Seok Moon

Provided are an electrolyte for a lithium secondary battery and a lithium secondary battery including the electrolyte, wherein the electrolyte further includes a solid salt as an additive, wherein the solid salt contains one type of cation selected from ammonium-based cations and a thiocyanate anion (SCN). According an embodiment, the lithium secondary battery may have improved life characteristics by providing the electrolyte containing the additive.

Electrolyte for lithium secondary battery and lithium secondary battery comprising same

Provided is an electrolyte solution for a lithium secondary battery and a lithium secondary battery having the same, the electrolyte solution further including an expressed solid salt which has an ammonium-based cation and a cyanide anion (CN). According to an embodiment of the present invention, an electrolyte solution including the solid salt may be provided, and thus the problem of decrease in stability of a negative electrode due to copper ions that are dissolved from a copper current collector in a high-temperature environment may be resolved. Therefore, a lithium secondary battery having excellent battery performance such as battery capacity, charging and discharging efficiency, and cycle characteristics even under a high-temperature condition may be provided.

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

An electrolyte solution for a lithium secondary battery includes a lithium salt, an organic solvent, and a solid salt as an additive, the solid salt including at least one cation selected from ammonium-based cations and an azide anion (N&#x2014;). Using the electrolyte solution including the additive may provide a lithium secondary battery with improved high-temperature retention characteristics.

Provided are a cathode active material for a lithium secondary battery, a method of fabricating the same, and a lithium secondary battery including the same. The cathode active material includes a lithium composite transition metal oxide represented by LiNiCoMnOF(0.1&#x2266;c&#x2212;a&#x2266;0.4, 0.13&#x2266;a&#x2266;0.3, 0.03&#x2266;b&#x2266;0.2, 0.4&#x2266;c&#x2266;0.6, (a+b+c)+(1+(c&#x2212;a)/2)=2, 0&#x3c;x&#x2266;0.15, 1&#x2266;a/b&#x2266;6, 1.9&#x2266;c/a&#x2266;4.0, and 0.04&#x2266;b/(a+b+c)&#x2266;0.25), and layer-structured LiMnO. Since the lithium secondary battery including the cathode active material has a large capacity and generates less gas, lifespan characteristics and high rate capability are significantly improved, and especially voltage variation during charging and discharging operations is small.

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Seoul, South Korea

Tae Hwan Yu