Lg Energy Solution, Ltd.

Lg Chem, Ltd

Ho June Kim

Joo Sung Lee

Min Ji Kim

Min Ji Heo

The present invention relates to a lithium secondary battery which includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte solution, wherein a patterned gel polymer electrolyte layer is included on one surface or both surfaces of at least one structure of the positive electrode, the negative electrode, or the separator.

Secondary battery

The present invention provides a positive electrode for a lithium secondary battery, including a first positive electrode active material including a lithium cobalt-based oxide, and a second positive electrode active material including a lithium composite transition metal oxide containing at least two selected from the group consisting of nickel (Ni), cobalt (Co), and manganese (Mn), wherein, when the state of charge (SOC) of the first positive electrode active material in which the voltage of the lithium secondary battery reaches a constant voltage (CV) at 1 C-rate is referred to as SOC, and the state of charge (SOC) of the second positive electrode active material in which the voltage of the battery reaches a constant voltage (CV) at 1 C-rate is referred to as SOC, the SOCand the SOCsatisfy the relationship represented by Equation 1 below.SOC&#x3c;SOC&#x3c;1.1&#xd7;SOC&#x2003;&#x2003;[Equation 1]

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Daejeon, South Korea

Ho June Kim