Cathode for lithium secondary battery and lithium secondary battery comprising the same

A cathode for a lithium secondary battery, comprising:

• a current collector;
• a first composite layer formed from a mixture of olivine-type lithium iron phosphate cathode active material powder and a binder on the current collector;
• and
• a second composite layer formed from a mixture of olivine-type lithium iron phosphate cathode active material powder and a binder on the first composite layer,
• wherein a specific surface area of the olivine-type lithium iron phosphate cathode active material powder in the second composite layer is 0.01 to 0.8 times that of the olivine-type lithium iron phosphate cathode active material powder in the first composite layer,
• wherein a load amount of the cathode active material in the first composite layer is equal to or different from that of the cathode active material in the second composite layer,
• wherein the load amount of the cathode active material in the first composite layer is 5 to 25 mg/cm2.

A cathode for a lithium secondary battery, comprising:

• a current collector;
• a first composite layer formed from a mixture of olivine-type lithium iron phosphate cathode active material powder and a binder on the current collector;
• and
• a second composite layer formed from a mixture of olivine-type lithium iron phosphate cathode active material powder and a binder on the first composite layer,
• wherein a specific surface area of the olivine-type lithium iron phosphate cathode active material powder in the second composite layer is 0.01 to 0.8 times that of the olivine-type lithium iron phosphate cathode active material powder in the first composite layer,
• wherein a load amount of the cathode active material in the first composite layer is equal to or different from that of the cathode active material in the second composite layer,
• wherein the load amount of the cathode active material in the second composite layer is 5 to 25 mg/cm2.