Abstract: A gel electrolyte comprising a polymer, a get solvent and a compound of formula (I): wherein X is Al or B; R1 in each occurrence is independently a substituent and two R groups may be linked to form a ring; and M+ is a cation. The gel electrolyte may be used in a metal battery or a metal ion battery.

Abstract: An electrochemical cell having a cathode comprising a fluorinated carbon nanotube (F-CNT), an anode and a solid electrolyte; wherein the solid electrolyte comprises an electrolyte component comprising 50 to 95 wt. % of an alkali metal-containing electrolyte salt, and 5 to 50 wt. % of a polymer. Embodiments do not require a carbon-based conductive-adjuvant in the cathode. The thickness of the solid electrolyte may be least 5 microns. A container comprising cell may have space to allow for thermal expansion thereof. They may be used at elevated temperatures greater than 65° C. or more, such as in a subterranean well.