TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Method: The method (M1) further heating is to a temperature that is greater than or equal to 385 degrees C; sequentially repeating each of the steps to generate oxygen at an average flow rate over a time period; cooling the lithium chloride product in the vessel so that the lithium chloride product remains in the vessel in solid form, where the cooling step comprises cooling the vessel and lithium chloride left in the vessel after decomposition to a cooling temperature that is less than or equal to the melting point of lithium chloride, or less than or equal to 610 degrees C; cooling the generated free oxygen thereby reducing the free oxygen temperature and humidity; and controlling a flow of generated free oxygen by monitoring a pressure in a plenum that stores the generated free oxygen. The method is a batch method having a periodic generation of oxygen and a periodic portion without substantial oxygen generation. The multiple vessels are operated sequentially to produce an average flow rate of total generated oxygen equal to the number of vessels times an average flow of generated oxygen from each vessel. The rinsing step involves introducing a rinse liquid that is water-based to the vessel; and removing the rinse liquid from the vessel, where all of the lithium chloride solid product and rinse liquid is removed from the vessel, and the water-based rinse liquid optionally comprises lithium chloride product. The residual heat from the thermal decomposition of lithium chlorate is used to preheat the oxygen generating liquid, the rinse liquid, or both the oxygen generating liquid and the rinse liquid. The residual heat is from oxygen and steam released during the heating; reaction vessel and the solid lithium chloride product generated from the heating and decomposition steps; or rinse liquid collected after the rinsing step. The average rate of oxygen generation from the vessel is controlled by varying the amount of oxygen generating liquid introduced to the vessel; and/or varying the rate of heat application. The method having a user-selected maximum generated oxygen average flow (Q), and system parameters are as given in specification. The periodically generated oxygen is stored in a plenum from which oxygen can be provided, and the generated oxygen is provided on-demand from the plenum at a user-selected oxygen flow-rate for use in a downstream application. The portion of lithium chloride solid product remains in the vessel after rinsing and is a catalyst for subsequently introduced lithium chlorate solution for generating free oxygen, and the catalyst decreases the decomposition temperature by up to 60 degrees C compared to decomposition temperature without catalyst. The rinse liquid collected after the rinsing step is returned to a container in thermal contact with a storage vessel that holds the oxygen-generating liquid to be introduced to the vessel, where the storage vessel and the vessel that holds the oxygen-containing liquid are separated from each other by a movable separator capable of heat transfer. The heating uses waste heat from an oxygen generation process.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Device: The device further comprises reaction vessels, where each reaction vessel has an interior volume for holding the oxygen generating liquid; a directional control mechanism for flipping an interior volume orientation between a downward-facing and an upward-facing orientation; a rinse liquid, where the rinse liquid is introduced to the interior volume in a downward-facing orientation, where the rinse liquid drains from the interior volume under gravity to remove solid lithium chloride; a storage vessel having an oxygen generating liquid volume for storing oxygen generating liquid and a rinse liquid volume for storing rinse liquid; a movable separator that separates the oxygen generating liquid volume from the rinse liquid volume; an oxygen generating liquid volume conduit for delivering oxygen generating liquid from the storage vessel to the reaction vessel, where the rinse liquid introduced to the interior volume is supplied to the rinse liquid volume and heat from the introduced rinse liquid is transferred to the stored oxygen generating liquid volume by the movable separator; and interconnects between the vessel and other pressure-generating components to provide pressure equilibration between the vessel and other pressure-generating components thereby minimizing power required to generate fluid flow. EXAMPLE - No suitable example given.