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The performance of lithium‐ and sodium‐ion batteries relies notably on the accessibility to carbon electrodes of controllable porous structure and chemical composition. This work reports a facile synthesis of well‐defined N‐doped porous carbons (NPCs) using a poly(ionic liquid) (PIL) as precursor, and graphene oxide (GO)‐stabilized poly(methyl methacrylate) (PMMA) nanoparticles as sacrificial template. The GO‐stabilized PMMA nanoparticles are first prepared and then decorated by a thin PIL coating before carbonization. The resulting NPCs reach a satisfactory specific surface area of up to 561 m 2  g −1  and a hierarchically meso‐ and macroporous structure while keeping a nitrogen content of 2.6 wt%. Such NPCs deliver a high reversible charge/discharge capacity of 1013 mA h g −1  over 200 cycles at 0.4 A g −1  for lithium‐ion batteries, and show a good capacity of 204 mA h g −1  over 100 cycles at 0.1 A g −1  for sodium‐ion batteries.

Poly(ionic liquid)‐Derived N‐Doped Carbons with Hierarchical Porosity for Lithium‐ and Sodium‐Ion Batteries