“…Such materials are able to store sodium ions with a high reversible capacity (between 250 and 300 mAh g -1 ), low working potential (vs. Na + /Na) and good cycling stability [36,37]. Moreover, they are inexpensive and easy to synthesize from many carbonaceous precursors, mainly oxygen-rich molecules and polymers [36] such as, for example, sucrose [5,38,39], glucose [8,26,40], cellulose [6,33,41,42], lignin [2,43], phenolic resins [44][45][46][47][48] or pre-oxidized pitch [34,45,49]. Among all the precursors of hard carbons, those derived from biomass are of great interest lately, such as lignocellulosic biomass and fruit wastes [36,[50][51][52][53][54][55][56][57].…”