lithium power source

The possibility of the use of impedance spectroscopy using an impulse method of step current change and recording voltage change in during time at the terminals of a cell with subsequent Fourier transform of the input signal and the response to it to assess the current state of Li-cell. It is proposed use of current pre-impulse in order to minimize the influence of passive film. It is substantiated an algorithm based on the measurements of impedance phase for determining of residual capacity.

A series of doped lithium-manganese spinels with a common formula LiMn_2-xСо_xO₄, 0 < х < 1, and LiMn_2-x-yCr_xСо_yO₄, 0 < х + у < 1, was synthesized. The structural and electrochemical properties of these compounds were studied. Replacement of Mn atoms in LiMn₂O₄ by Co or Co&Cr ones in a Mn:Me 195:5 ratio is shown to reduce the degradation of the discharge capacity at cycling with no decrease of its magnitude.

In the review the works on the development of liquid organic electrolyte systems for lithium power sources in the past 10 years are considered. The review consists of chapters on the state-of-the-art and prospects of investigations on lithium salts, aprotic solvents, and additives to the liquid electrolyte, performing a variety of functions to improve the performance of the lithium power source. Bibliography – 168 references.