Positive active material, positive electrode and rechargeable lithium battery including same

摘要

A positive active material for a rechargeable lithium battery is disclosed. The positive material includes including a lithium-manganese oxide-based solid solution including primary particles and secondary particles having a particle diameter (D50) in the range of about 1 μm to about 5 μm, a particle diameter (D90) in the range of less than about 8 μm, and a crystallite diameter of less than or equal to about 150 nm. The positive electrode for a rechargeable lithium battery includes the lithium manganese oxide-based solid solution is also disclosed.

主权项

1. A positive active material for a rechargeable lithium battery comprising a lithium manganese oxide-based solid solution comprising
a primary particle and a secondary particle, wherein the primary particles are agglomerated and form the secondary particles, wherein a particle diameter (D50) of the secondary particle is in the range of about 1 μm to less than 5 μm, a particle diameter (D90) of the secondary particle is less than about 8 μm, and a crystallite diameter as measured by the Scherrer equation is less than or equal to about 150 nm; and wherein the particle diameter (D50) of the secondary particle and the particle diameter (D90) of the secondary particle have a relationship satisfying the following Equation 1:
0.7≦(D90-D10)/D50≦1.3.