Conductive material dispersion, positive electrode manufactured using the same, and rechargeable lithium battery including the positive electrode

A conductive material dispersion for a rechargeable lithium battery, the conductive material dispersion comprising:

• a conductive material;
• and
• a dispersant,
• wherein the conductive material comprises carbon nanotubes having an average diameter of 4 nm or more and 15 nm or less and an average specific surface area of 200 m2/g or more and 800 m2/g or less,
• the dispersant comprises hydrogenated nitrile butadiene rubber having a weight average molecular weight of 200,000 to 500,000 g/mol, and
• the dispersion satisfies the following Equation 1:
• 0
• .
• 7
• ≤
• S
• ×
• 2
• /
• R
• ≤
• 1
• ,
• where, in Equation 1, when an AC voltage is applied to the carbon nanotube dispersion and AC resistance and reactance are measured while increasing a frequency from 0 Hz, the reactance increases and decreases first and then increases and decreases second, and an AC resistance value when the reactance is at a minimum value of the first decrease and the second increase is defined as R (units:
• Ω), and a reactance value when the reactance is at a maximum value of the second increase and the second decrease is defined as S (units:
• Ω).