I mean all the energy of the circuit is applied acrooss the switch and load at the boost converter, the store current into the coil will be discharged thru a diode into a capacitor, thereto the switch has across drain and source, the the voltage from the battery sum with the inductor voltage...
In the case of the drawing i made the potential decrease at that point at the same rate that it increase so it would remain 0 if wasn~t for the battery potential;;;
when greater than 50% duty cycle is used more energy is acumulated assuming the discharge occurrs quick enough i guess the solution is going multi phase...