| abstract |
The present invention proposes a lithium secondary battery comprising: a non-aqueous liquid electrolyte comprising bis(fluorosulfonyl)imide lithium (LiFSI) and a fluorinated benzene-based compound as an additive, comprising lithium-nickel- A manganese-cobalt-based oxide is used as a positive electrode, a negative electrode, and a separator of a positive electrode active material.nWhen the nonaqueous liquid electrolyte for a lithium secondary battery of the present invention is initially charged, when a lithium secondary battery including the nonaqueous liquid electrolyte is initially charged, a solid SEI film is formed on the negative electrode, and the output property of the lithium secondary battery is improved, It also enhances the output properties and stability after high temperature storage. |