There is an extensively growing interest in using paper or paper-like substrates for batteries and other
energy storage devices. Due to their intrinsic characteristics, paper (or paper-like) batteries show
outstanding performance while retaining low cost, multifunctionality, versatility, flexibility and disposability.
In this overview, we review recent achievements in paper (or paper-like) batteries as well
as their applications. Various types of paper power devices are discussed including electrochemical
batteries, biofuel cells, lithium-ion batteries, supercapacitors, and nanogenerators. Further scientific and
technological challenges in this field are also discussed.