Patent ID: 8628645

Claim:
A method of depositing a lithium cobalt oxide film on a battery substrate in a sputtering chamber comprising (i) a substrate support, (ii) first and second sputtering targets, (iii) a first electrode contacting the backside surface of the first sputtering target and a second electrode contacting the backside surface of the second sputtering target, and (iv) a first magnetron comprising a first rotatable magnet assembly behind the first sputtering target and a second magnetron comprising a second rotatable magnet assembly behind the second sputtering target, the method comprising: (a) placing an array of substrates on the substrate support; (b) providing first and second sputtering targets in the sputtering chamber, the first and second sputtering targets each consisting of lithium metal oxide; (c) maintaining a sputtering gas at a pressure in the sputtering chamber; (d) energizing the sputtering gas by applying an alternating voltage from an AC power supply to the first and second electrodes at a frequency of between about 10 and about 100 kHz such that each of the first and second electrodes alternately serves as an anode or a cathode; and (e) rotating the first and second rotatable magnet assemblies at a rotational frequency of between about 0.005 and about 0.1 Hz to provide a variable magnetic field about the first and second sputtering targets.