To provide a secondary battery excellent in safety without reducing the capacity thereof.
The present invention relates to a secondary battery including: an electrode assembly comprising a first electrode plate including an active material layer where a first active material is coated on a collector and a plain part where the active material is not coated, a second electrode plate including an active material layer where a second active material is coated on a collector and a plain part where the active material is not coated, and a separator interposed between the first and second electrode plates; an electrolyte comprising a lithium salt at a concentration of 0.5-1 M and an organic solvent; and a case accommodating the electrode assembly and the electrolyte therein.
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Yasuhiko Murayama