Lg Chem, Ltd

Lg Energy Solution, Ltd.

Won Hee Jeong

Jae Hyun Lee

Geun Chang Chung

Sin Kyu Kim

Min Hee Lee

Jung Woo Yoo

Sung Chul Park

Young Jae Kim

Seung Ryul Choi

Su Hwan Kim

Ung Ju Lee

Sun Jung Hwang

Koo Seung Chung

Kyungkoo Lee

Min Sun Cho

The present invention provides a composition for forming an insulating layer for a lithium secondary battery, which includes a binder polymer; a coloring agent including at least one selected from the group consisting of an organic dye, an oil-soluble dye and an organic phosphor; and a solvent, and has a viscosity of 1,000 cP or more at 25&#xb0; C.

Composition for forming insulating layer for lithium secondary battery and method of preparing electrode for lithium secondary battery using the same

Disclosed is a positive electrode for secondary batteries manufactured by coating and rolling a slurry for a positive electrode mix including positive electrode active material particles on a current collector, wherein the positive electrode active material particles include one or more selected from the group consisting of lithium iron phosphate particles having an olivine crystal structure and lithium nickel-manganese-cobalt composite oxide particles according to Formula 1, the lithium nickel-manganese-cobalt composite oxide particles existing as secondary particles formed by agglomeration of primary particles, in an amount of greater than 50% and less than 90% based on the total volume of lithium nickel-manganese-cobalt composite oxide, and the lithium iron phosphate particles existing as primary particles in an amount of greater than 50% and less than 100% based on the total volume of lithium iron phosphate (Formula 1 is the same as defined in Claim).

Positive electrode for secondary batteries and secondary battery including the same

Disclosed herein is a lithium secondary battery including a positive electrode including lithium iron phosphate and layered lithium nickel manganese cobalt oxide as a positive electrode active material and a negative electrode including a negative electrode active material having a potential difference of 3.10 V or higher from the lithium iron phosphate at a point of 50% state of charge (SOC) afforded by the entirety of the lithium iron phosphate.

Secondary battery

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Daejeon, South Korea

Won Hee Jeong