There is provided a lithium secondary battery with a negative electrode
which comprises a negative electrode active material layer comprising
alloy particles comprising silicon and tin and having an average particle
diameter of 0.05 to 2 .mu.m as an active material, and a negative
electrode current collector, wherein the negative electrode active
material layer has a storage capacity of 1,000 to 2,200 mAh/g and a
density of 0.9 to 1.5 g/cm.sup.3 and which thereby has a high capacity
and a good cycle-characteristic. Thus, a lithium secondary battery having
a high capacity and a long life and so designed as to exhibit these
characteristics at the same time is provided.