Provided is an electrode mix for a secondary battery containing an electrode active material, comprising a PVA having a degree of polymerization of more than 2500 and a degree of saponification of more than 90% as a binder, and a lithium secondary battery comprising the same. An iteration from one of these depth estimation techniques is selected based on results, such as based on largest absolute value, and checked. Each electrode within the bipolar electrostatic chuck is respectively connected to a terminal on the primary power. The heater may also be turned on when condensation is sensed by a sensor, and the sensor reading may be used to override the preset times. A T-handle allows the user to carry the device from site to site.