LIQUID ELECTROLYTE FOR LITHIUM ACCUMULATOR, COMPRISING A MIXTURE OF NON-AQUEOUS ORGANIC SOLVENTS

摘要

The invention related to a liquid electrolyte for a lithium battery comprising a lithium salt dissolved in a mixture of three non-aqueous organic solvents. This mixture consists of: 33% to 49 volume % of propylene carbonate, 33% to 49 volume % of diethyl carbonate, and 2% to 34 volume % of ethyl acetate. The liquid electrolyte is in particular suitable for a lithium battery based on the LiFePO4/Li4Ti5O-12 pair or derivatives thereof, these materials being the respective active materials of the positive and negative electrodes. Such a lithium battery in fact has the advantage of operating in power, over a wide temperature range, while at the same time preserving a low self-discharge capacity.