The invention aims to provide a lithium secondary battery exhibiting the
improved function of self safety in an abnormal state without sacrificing
battery characteristics. To attain the object, in a lithium secondary
battery comprising a positive electrode (3a, 3b), a negative electrode
(2a, 2b), an electrolytic solution, and a separator, a plurality of
positive electrodes (3a, 3b) and negative electrodes (2a, 2b) are
arranged to construct an electrode structure which includes an outermost
layer of electrode on which a back coat layer (11) is formed.