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.