Carbon‐Coated Porous Aluminum Foil Anode for High‐Rate, Long‐Term Cycling Stability, and High Energy Density Dual‐Ion Batteries

A 3D porous Al foil coated with a uniform carbon layer (pAl/C) is prepared and used as the anode and current collector in a dual-ion battery (DIB). The pAl/C-graphite DIB demonstrates superior cycling stability and high rate performance, achieving a highly reversible capacity of 93 mAh g−1 after 1000 cycles at 2 C over the voltage range of 3.0–4.95 V. In addition, the DIB could achieve an energy density of ≈204 Wh kg−1 at a high power density of 3084 W kg−1.