A highly preferred orientation of I2-LiI(HPN)2 film on the paper was found. The electrochemical property
of a new flexible all-solid-state Li/I2-LiI(HPN)2 film paper battery was examined at wide temperatures for
the first time. This paper battery is capable of achieving a high discharge energy of 250 Wh/kg with a
plateau potential region at 2.70 V versus Li/Liþ at 70 C. The interfacial layer of (LiI)(1þx)I(2x) (HPN)2
instead of LiI between lithium and I2-LiI(HPN)2 film should be responsible for the high electrochemical
activity of the lithiumeiodine paper battery.