Pre-Dispersion for Positive Electrode and Positive Electrode Slurry for Lithium Secondary Battery Containing the Same

A method of manufacturing a pre-dispersion for a positive electrode of a lithium secondary battery, comprising:

• mixing a positive electrode additive represented by the following Chemical Formula 1, a first conductive material, and a binder to prepare a pre-dispersion,
• wherein, when measured by ultraviolet/visible (UV/Vis) absorbance spectroscopy over a wavelength range of 350 nm to 800 nm, the pre-dispersion has an area of a peak appearing in a wavelength range of 560 to 680 nm that occupies 50% or more of the total peak area:
• LipCo(1-q)M1qO4 [Chemical Formula 1]
• wherein,
• M1 is one or more elements selected from the group consisting of W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo,
• 5≤p≤7 and 0≤q≤0.5.

A method of preparing a positive electrode slurry for a lithium secondary battery, comprising:

• mixing a positive electrode additive represented by the following Chemical Formula 1, a first conductive material, and a binder to prepare a pre-dispersion;
• and
• mixing a positive electrode active material, a second conductive material, and the pre-dispersion to prepare a positive electrode slurry;
• wherein, when measured by ultraviolet/visible (UV/Vis) absorbance spectroscopy over a wavelength range of 350 nm to 800 nm, the pre-dispersion has an area of a peak appearing in a wavelength range of 560 to 680 nm that occupies 50% or more of the total peak area:
• LipCo(1-q)M1qO4 [Chemical Formula 1]
• wherein,
• M1 is one or more elements selected from the group consisting of W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo,
• 5≤p≤7 and 0≤q≤0.5.