337 Sodiummetalchloride Battery

The sodium-metal-chloride battery is a derivative of the sodium-sulfur battery with intrinsic provisions of overcharge and overdischarge. The construction is similar to that of the NaS battery, but the positive sulfur electrode is replaced by nickel chloride (NiCl2) or a mixture of nickel chloride and ferrous chloride (FeCl2). The negative electrode and the electrolyte are the same as in a NaS battery. The schematic diagram of a NaNiCl2 cell is shown in Figure 3.7. In order to provide good ionic contact between the positive electrode and the electrolyte, both of which are solids, a second electrolyte of sodium chloraluminate (NaAlCU) is introduced in a layer between NiCl2 and beta-alumina. The NaAlCl4 electrolyte is a vital component of the battery, although it reduces the specific energy of the battery by about 10°%.- The operating temperature is again high, similar to that of the NaS battery. The basic cell reactions for the nickel chloride and ferrous chloride positive electrodes are as follows:

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