| 摘要 |
To improve an impregnation property of an electrolyte and the cycle characteristics, which have been a problem in the case of employing a casing having a variable shape. A lithium secondary cell comprising a casing having a variable shape, and a cell element having a positive electrode, a negative electrode and an electrolyte, sealed in the casing, wherein a compound represented by following formula ( 1 ) is contained in the lithium secondary cell: <?in-line-formulae description="In-line Formulae" end="lead"?>A1-X-A2 ( 1 ) <?in-line-formulae description="In-line Formulae" end="tail"?> (wherein X is a Group VI element in the periodic table, and A1 and A2 represent an aromatic group, provided that A1 and A2 may be the same or different, and may be connected each other to constitute a ring.)
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