fluorocarbon-lithium cell

Corrosion behavior of niobium current leads of fluorocarbon-lithium cells are studied. Polarization measurements at plain niobium leads and at such leads in a contact with fluorocarbon cathode in an electrolyte of fluorocarbon-lithium cell were carried out. Besides, behavior of niobium lead directly in a feedthrough of real cells was studied. The contact of niobium with fluorocarbon cathode is shown to result in toughening of corrosion conditions and in possible niobium depassivation.

For the purpose of creation of a reliable current conductor for fluorocarbon-lithium cell with use of the fast-tempered materials the corrosion and electrochemical behavior of microcrystalline AV-86 alloy and also amorphous Ni₈₁P₁₉ and Fe₇₀Cr₁₀P₁₃C₇ alloys in electrolytes on a basis ?-butyrolactone (GBL) is studied. The high corrosion resistance and conductivity of amorphous materials do perspective their use as current conductor of current sources.

The power sources of the lithium­-fluorinated carbon electrochemical system often fail to withstand forced discharges because of greater heat emission due to ohmic and polarizing losses, which leads to heating at the best, and to destruction of the element and failure of the equipment at the worst. Heat emission from the cells of the lithium manganese–dioxide system at forced discharges is 2–3 times less than from the similar cells of the lithium–fluorinated carbon system.

Various features of creation of the lithium­-fluorocarbon power sources were considered. The electrochemical characteristics of the electrodes, which were manufactured using various compositions of fluorocarbon and silver vanadate, were studied. It was found that the electrodes based on the mass ratio CF_x : SVO 82.5 : 7.5 show the best properties. The composite electrodes have significant advantages in discharge potential, capacity and stability compared with the fluorocarbon ones.