A complex of theoretical researches including the detail quantum chemical m
odeling of forming EAP and multielectron processes of reduction in ionic me
lts has been fulfilled. The mechanism of forming EAP in melts containing ni
trate, carbonate and in fluoride melts containing boron and titanium has be
en theoretically established. The determining influence of acid-base proper
ties of melt on mechanism of forming EAP, confirmed by the results of elect
rochemical measurements for melts containing nitrate and carbonate and theo
retically by calculated quantities of force constants of oxyanions has been
proved. There has been established the optimum form of EAP, the reduction
ability of which depends on adsorption properties of electrode surface and
electric field.