A flexible, light weight and high conductivity current collector is the key element that enables fabrication of high performance flexible lithium ion battery. Here we report a thin, light weight and flexible lithium ion battery that uses graphite papers deposited with nano-sized metallic layers as the current collector, LiFePO 4 and Li 4 Ti 5 O 12 as the cathode and anode materials, and a PE membrane soaked in LiPF 6 as the separator. Using thin and flexible graphite paper as a substrate for the current collector instead of a rigid and heavy metal foil enables us to demonstrate an ultra-thin lithium-ion battery (total thickness including encapsulation layers of less than 250 µm) that also features light weight and high flexibility.

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