Activated hard carbon from orange peel for lithium/sodium ion battery anode with long cycle life

Activated non-graphitizable orange peel derived hard carbon (OPDHC-A) with micropores structure has been prepared by pyrolyzation at 800 °C and KOH activation. The determined BET surface areas are 638 m2/g. At 0.05 A g-1, an initial capacity 878 mA h g−1 at 1 A g-1 for lithium ion battery (LIB) and 497 mA h g−1 at 0.5 Ag-1 for sodium ion battery (NIB) were achieved. Importantly, 3000 cycling stability at 2 A g-1 for LIB and 1000 cycling stability at 1 A g-1 for NIB can been obtained. The excellent performance may be attributed to the disorder activated hard carbon structure with micropores structure which facilitate electrolyte penetration and provide sites for Li+ and Na+ ion storage.