Cathode, method of preparing the same, and lithium battery including the cathode

A lithium battery comprising:

• a cathode incorporating a current collector and a cathode active material layer disposed on the current collector;
• an anode;
• a separator separating the cathode and the anode;
• a battery case incorporating the cathode, anode, and separator;
• an organic electrolyte;
• and
• a cap assembly, wherein:
• the cathode active material layer further comprises a lithium transition metal oxide having a spinel structure, a conductive agent, and a binder,
• at least a portion of a surface of the cathode active material layer is fluorinated, wherein an average working potential of the lithium transition metal oxide having the spinel structure is in the range of about 4.6 V to 4.95 V;
• the cathode, anode and separator are wound or folded and housed in the battery case, and
• the cathode, anode, separator and organic electrolyte are sealed in the battery case with the cap assembly.