| abstract |
A non-aqueous liquid electrolyte secondary cell having a negative electrode formed of a carbon material capable of being doped with and releasing lithium, a positive electrode, and a non-aqueous liquid electrolyte having an electrolyte dissolved in a non-aqueous solvent, is disclosed. This cell contains pyrocarbonate having the formula (ROCO)2O, wherein R is an alkyl group selected from the group consisting of CH3, C2H5 and C3H7. If the pyrocarbonate is mixed with other non-aqueous solvent(s), the proportion of the pyrocarbonate in the non-aqueous solvent, is not less than 25 vol%. The non-aqueous liquid electrolyte secondary cell is capable of withstanding charging/discharging cycles at high charging voltages, while exhibiting satisfactory charging/discharging cyclic performance under high temperature environment and superior discharging performance under low-temperature environment and heavy loads. |