An electrode active material forming composition, a separator forming
composition and a manufacturing method of a lithium secondary battery
using the compositions are provided. The method for manufacturing a
lithium secondary battery including the steps of (a) coating electrode
active material compositions each comprising a electrode active material,
a binder and a solvent on an electrode current collector to form a cathode
and an anode, (b) forming a separator on both surfaces of the anode using
a composition for forming a separator comprising a polymer resin, a
plasticizer, a filler and a solvent; (c) disposing and fixedly adhering
the cathode on the separator to form a battery structure, (d) drying the
battery structure under a vacuum condition, and (e) impregnating an
electrolytic solution into the resultant structure, wherein the
plasticizer of the composition for forming the separator is at least one
material selected from the group consisting of an ethylene glycol
derivative, a cyclic carbonate, a non-cyclic carbonate and propylene
glycol carbonate. Therefore, since a plasticizer can be removed under a
vacuum condition, the time required for manufacturing a battery can be
reduced and the manufacturing process becomes simplified, thereby
improving the productivity. Also, since an organic solvent extraction
process using an organic solvent is not necessary, unlike in the
conventional art, the cost required for a recovery facility of an organic
solvent can be reduced. Further, uniform pores are formed in electrodes
and a separator, the porosity characteristics are excellent, and adhesion
between the separator and the electrodes is excellent, thereby exhibiting
excellent high-rate, lifetime, and low-temperature characteristics.
