Positive electrode for rechargeable lithium battery, and rechargeable lithium battery including the same

A positive electrode for a rechargeable lithium battery, the positive electrode comprising:

• a positive electrode current collector;
• a first positive electrode active material layer on the positive electrode current collector;
• and
• a second positive electrode active material layer on the first positive electrode active material layer;
• wherein the first positive electrode active material layer comprises a first particle represented by the following Chemical Formula 1,
• wherein the second positive electrode active material layer comprises a second particle represented by the following Chemical Formula 2, and a third particle represented by the following Chemical Formula 3,
• wherein the first positive electrode active material layer is substantially free of the third particle, and
• wherein, in the second positive electrode active material layer, a weight ratio of the second particle to the third particle is from about 1:1 to about 1:3,
• Li
• a
• ⁢
• 1
• ⁢
• Mn
• z
• ⁢
• 1
• ⁢
• Fe
• x
• ⁢
• 1
• ⁢
• B
• ⁢
• 1
• y
• ⁢
• 1
• ⁢
• P
• ⁢
• O
• 4
• -
• b
• ⁢
• 1
• Chemical
• ⁢
• Formula
• ⁢
• 1
• wherein 0.8≤a1≤1.2, 0≤z1≤0.9, 0.1≤x1≤1, 0≤y1≤0.05, 0<b1≤0.05, and x1+y1+z1=1,
• wherein B1 comprises at least one of Ti, Mg, V, Al, and a combination thereof,
• Li
• a
• ⁢
• 2
• ⁢
• Mn
• z
• ⁢
• 2
• ⁢
• Fe
• x
• ⁢
• 2
• ⁢
• B
• ⁢
• 2
• y
• ⁢
• 2
• ⁢
• P
• ⁢
• O
• 4
• -
• b
• ⁢
• 2
• Chemical
• ⁢
• Formula
• ⁢
• 2
• wherein 0.83a2≤1.2, 0.5≤z2≤0.9, 0.1≤x2<0.5, 0≤y2≤0.05, 0<b2<0.05, and x2+y2+z2=1,
• wherein B2 comprises at least one of Ti, Mg, V, Al, and a combination thereof,
• Li
• a
• ⁢
• 3
• ⁢
• Ni
• x
• ⁢
• 3
• ⁢
• Co
• y
• ⁢
• 3
• ⁢
• Ma
• z
• ⁢
• 3
• ⁢
• B
• ⁢
• 3
• w
• ⁢
• 3
• ⁢
• O
• 2
• -
• b
• ⁢
• 3
• Chemical
• ⁢
• Formula
• ⁢
• 3
• In the Chemical Formula 3, 0.8≤a3≤1.2, 0.8≤x3<1, 0<y3≤0.2, 0<<z3≤0.2 0≤w3≤0.1, 0≤b3≤0.05, and 0.9≤x3+y3+z3+w3≤1.1, and
• wherein Ma comprises at least one of Al, Mn, and a combination thereof, and B3 comprises at least one of Mg, Ti, V, Zr, Mo, Nb, and a combination thereof.