Sulfur is a great cathode. problem isit is not electronically nor ionically conductive so it has to becombined with conductive additives and gelated by solvents in orderto function as a cathode (which reduces the active material loadingin the cathode). the theoretical capacity of sulfur is 1670 Ah/kg(compare to ~140 for lithium cobalt oxide cathode used in batteriesnow so 12 times higher). The "downside" is that a Li/Sbattery discharges at about 2V, or about 1/2 of your typical Li-ionbattery. So, lets assume you could obtain a more realistic Q=125Ah/kg capacity if you take into account the weight of othercomponents in the battery. If you discharge at 1C you get 125 A from1 kg battery. The power would be P=I x V = 125A x 2V = 250 W from 1kg sulfur. The energy would be E=Q x V = 125Ah x 2V = 250 Wh for 1 kgbattery. Now of course if you can keep the same capacity and higherdischarge rates (2C), then the power doubles to 500W.
This means that for 50 kWh of energyyou need 200 kg battery. So you can get the same driving range of theroadster with half the battery weight. You also get the same powerbased on V= I x R with only half the discharge rate 2C vs 4C forroadster which means higher safety.
Problems are that the voltages arelower (1/2) if you put the same number of cells in series as in theroadster battery pack, so the power and energy comes from a highercurrent being drawn which will be affected more by losses due tovarious resistances. In addition, the metal lithium anode is wellknow for dendritic formation so that will always be a stumblingpoint. However there is always hope for other anodes
This means that for 50 kWh of energyyou need 200 kg battery. So you can get the same driving range of theroadster with half the battery weight. You also get the same powerbased on V= I x R with only half the discharge rate 2C vs 4C forroadster which means higher safety.
Problems are that the voltages arelower (1/2) if you put the same number of cells in series as in theroadster battery pack, so the power and energy comes from a highercurrent being drawn which will be affected more by losses due tovarious resistances. In addition, the metal lithium anode is wellknow for dendritic formation so that will always be a stumblingpoint. However there is always hope for other anodes