RELATIONSHIP BETWEEN COMPOSITION OF THE ELECTROLYTE-SOLUTIONS AND ENERGETIC PERFORMANCE OF 1.5-V NONAQUEOUS CELLS OF LITHIUM IRON SULFIDE SYSTEM

Seven electrolyte solutions in equimolar solvent mixtures or in one-co mponent solvents have been selected on the basis of own results of res earch and on literature data: LiAsF6 in GBL+1,2-DME; LiClO4 in GBL+1,2 -DME; LiClO4 in GBL+2-MeTHF; LiAsF6 in PC; LiClO4 in PC; LiAsF6 in ANPC, and LiClO4 in AN. They were the basis for constructing seven serie s of the miniaturized coin-type R43 lithium cells with the Li/FeS elec trode system. Relationship between composition of the electrolyte solu tions and energy performance of the cells was studied for over 4800 h (200 days). The open-circuit voltage (emf) and the discharge curves (v oltage U versus time t) were determined for two load values R = 100 kO MEGA and R = 22 kOMEGA. The practical electric charge capacity Q(p), t he practical energy capacity E(p), the weights of the spent electrode materials (lithium m(Li) and iron sulfide m(FeS)), the practical speci fic energy E(ps), the electric charge and energy efficiency coefficien ts, eta(Qp), eta(Eps), were calculated. The best practical specific en ergy E(ps) has been obtained by cells with the solution of LiAsF, in e quimolar mixture AN + PC.