Description: New lithium battery electrolytes must be developed if these they are to be successfully deployed on NASA Platforms operating at -100oC to +100oC. Giner, Inc. has proposed an approach to preparing lithium ion conducting electrolytes which will provide cell current densities sufficient to carry the microwatt to milliwatt levels required for Low Earth Orbital Applications. Phase I will examine the low temperature phase behavior of the new electrolytes, ionic conductivity and chemical electrochemical stability in primary and secondary lithium cell environments, with exposures of up to +100oC in order to assess the likelihood of long cycle-life performance.