Lithium Secondary Battery, Battery Module, And Battery Pack

Abstract: The present invention relates to a lithium secondary battery. In an embodiment, the lithium secondary battery comprises: a positive electrode comprising a positive electrode active material; a negative electrode comprising a negative electrode active material; a separator between the positive electrode and the negative electrode; and an electrolyte, wherein the positive electrode active material comprises a lithium composite transition metal compound containing nickel (Ni), cobalt (Co), and manganese (Mn), the lithium composite transition metal compound comprises at least one of single particles or quasi-single particles, at least one of the single particles or the quasi-single particles has an average particle diameter (D50) of 1 µm or greater, the single particle consists of one nodule, the quasi-single particle is a composite consisting of 30 or less nodules, the negative electrode active material comprises a silicon carbon composite, the silicon carbon composite has an average particle diameter (D50) of greater than 1 µm, and the average particle diameter (D50) of at least one of the single particles and the quasi-single particles is smaller than the average particle diameter (D50) of the silicon carbon composite.

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