A High-Energy 5 V-Class Flexible Lithium-Ion Battery Endowed by Laser-Drilled Flexible Integrated Graphite Film.

Due to its highly in-plane oriented crystal structure, the flexible graphite film (GF) possesses excellent electrochemical corrosion resistance, high planar electrical conductivity, and considerable mechanical strength. In this work, the laser-drilled integrated graphite film (porous-GF, PGF) is unprecedentedly used as a key to fabricate a high-performance high-energy 5 V-class flexible PGF/PGF-LiNi0.5Mn1.5O4 full cell, where the flexible PGF is a self-standing flexible graphite anode for lithium-ion intercalation/deintercalation and a high-voltage resistance cathode current collector. This unique design based on the flexible PGF will endow the future flexible batteries with excellent characteristics of thin, lightweight, simple fabrication, and high energy. More encouragingly, unlike previously reported flexible electrodes using carbon nanomaterials as the nonmetal current collector, the mass production and processability of the flexible GF and PGF are feasible with the aid of commercially available roll-to-roll laser drilling technology.