NON-AQUEOUS LIQUID ELECTROLYTE AND NON-AQUEOUS LIQUID ELECTROLYTE SECONDARY BATTERY

A non-aqueous liquid electrolyte secondary battery using negative-electrode active material having Si, Sn and/or Pb, with high charge-capacity, superior characteristics including discharge-capacity retention rate over long is provided. Its non-aqueous liquid electrolyte contains carbonate having unsaturated bond and/or halogen and compounds like LiPFand/or LiBF(first lithium salt) and lithium salt different from said first one, represented by formula below (second lithium salt). Li(αX) (CHO)(CHO) is omitted (i and j represent integers of 2 or larger.)