Sodium-ion　hybrid　capacitors　(SIHCs)　hold　great　promise　in　large-scale　energy　storage　by　compromising　the　merits　of　sodium-ion　batteries　and　electrochemical　capacitors;　however,　the　mismatch　of　kinetics　and　capacity　between　battery-type　anode　and　capacitive-type　cathode　is　still　the　Achilles＇　heel　of　this　technology.　Herein,　nanohybrids　with　Mn　single　atoms　implanted　in　N,　F　co-doped　ultrathin　porous　carbon　nanosheets　(MnSAs/NF-CNs)　have　been　developed　as　both　the　anode　and　cathode　of　SIHCs.　The　systematic　experimental　study　coupled　with　theoretical　calculations　reveal　that　N-coordinated　Mn　atoms　(Mn-N4)　can　act　as　sites　not　only　for　reversible　Na+　storage　with　reduced　energy　barrier　but　also　for　improving　the　pseudocapacitance,　thus　making　great　contribution　to　accelerating　the　reaction　kinetics　of　the　anode　and　enhancing　the　capacity　for　the　cathode　in　SIHCs.　We　demonstrate　that　the　Janus-featured　MnSAs/NF-CNs　endows　SIHCs　with　an　impressively　high　energy/power　density　(maximum　197　W　h　kg-1/9350　W　kg-1)　and　ultralong　cycling　life　over　10 000　cycles.　This　journal　is　©　The　Royal　Society　of　Chemistry.