Electrolytes for sources of electrochemical power

New potassium-conducting solid electro-lytes in the mixed alumoferrite system K0.90Ba0.05Al1-xFexO2

New potassium-conducting solid electrolytes in the mixed alumoferrite system K0.90Ba0.05Al1-хFeхO were synthesized and studied. The effect of increasing conductivity with simultaneous presence of aluminium and ferrum cations has been established. The maximum conductivity in the system reaches very high values: – 6·10-2 S·cm-1 at 400°C, 2·10-1 S·cm-1 at 700°C. Possible nature of obtained results is discussed.

Volume Change When Melting Halides of s'-Elements and their Double Mixes: Analytical Description, Calculation and Interrelation

An important feature when using low-melting mixtures of halides of s-elements as a refiner of electrolytes for chemical power sources and thermal storage materials in thermal batteries is the amount of volume increase in the melting process which can be calculated by the formula [1]:
ΔV = ((Vк – Vж) / Vк)·100% = (ΔV/Vк)·100%,(1)
where Vк – the volume of a solid substance (or mixture) at the melting temperature; Vж – the volume of liquid at the melting temperature (substance or mixture); ΔV – volume difference in the liquid and solid states of the substance.
Identification of ΔV is necessary because all the halides increase their volume, therefore melting increases the mixture of halides volume. So, when filling chemical power sources and storage heaters by mixtures it is necessary to keep a share of the free volume not only for expansion of the mixture in the solid (including the transition from one crystal structure to another) and liquid state, but also for increasing of the melting compounds volume. But, in the literature [2,3] provides data on the increase volume in the melting is not for everyone halides s-elements (table 1).

Study of electrolyte composition effect on the properties of oxide solar cells

Properties of Dye Solar Cells with quasi solid electrolytes based on PEG have been investigated. The attempts to enhance the electrolyte conductivity was made with Li electrolyte introduction.

Solid potassium-conducting electrolytes in the systems K3-2xМxРO4 (М = Mg, Zn)

New potassium solid electrolytes in the systems K 3-2x M x PO 4 (M = Mg, Zn) were synthesized and studied. The introduction of Mg2+ and Zn2+ cations leads to sharp increasing of K 3 PO 4 conductivity due to potassium vacancies formation and stabilization of high temperature cubic modification of orthophosphate. Maximum conductivity is observed at x ≈ 0.15–0.25 and is equal to (6–8)·10-2 S·cm-1 at 400°C, higher than 10-1 S·cm-1 at 700°C. The factors influencing on the transport properties of investigated electrolytes are discussed.

Potassium ion conductivity in mixed gallate-ferrite solid electrolytes

New potassium solid electrolytes in the mixed gallate-ferrite systems K0.85Pb0.75(Ga1-xFex)O2 and K1.85(Ga1-xFe_x)1.925V0.75O4 were synthesized and studied. In the both systems the monotonic increasing of conductivity with increasing of Fe3+ concentration takes place, anomalies as in the early investigated aluminate-ferrite systems does not fixed. Conductivities at the intermediate ranges of «x» have rather high values (> 10-2 Cm·sm-1 at 50°C, > 1 Cm·sm-1 at 70°C), this allowes to optimize the composition of solid electrolytes at the relation of conductivity/stability properties.