Vanadium-based　materials　are　promising　as　cathodes　for　sodium-ion　batteries　owing　to　their　superior　cycling　behavior　and　rate　performance.　However,　there　is　a　critical　need　for　the　rational　implementation　of　Na+　intercalation　to　enhance　the　capacity.　Herein,　nano-Na3V2(PO4)(2)F-3　materials　were　synthesized　via　bulk　dismemberment　by　gas　released　by　the　decomposition　of　excess　citric　acid　to　trigger　some　degree　of　lattice　distortion　and　defects.　Owing　to　the　weakened　electrostatic　repulsion　between　sodium　ions　in　Na3V2(PO4)(2)F-3　with　an　enlarged　interlayer　spacing,　one　more　Na+　ion　could　be　readily　embedded　to　form　Na3V2(PO4)(2)F-3.　A　new　reaction　plateau　at　1.38　V/1.56　V　accompanied　the　V3+/V2+　redox　reaction,　inducing　a　capacity　of　250　mA　h　g(-1),　which　is　higher　than　that　of　highly　crystallined　Na3V2(PO4)(2)F-3.　A　noteworthy　reversible　redox　phenomenon　involving　three　sodium　ions　was　confirmed　during　the　cycling　process.　The　nano-Na3V2(PO4)(2)F-3　electrode　exhibited　a　capacity　retention　of　72%　at　1.3-4.5　V　after　20　cycles.　Thus,　this　novel　synthesis　routine　can　provide　vanadium-based　cathode　materials　with　enhanced　Na+　intercalation　properties,　which　can　be　applied　to　improve　the　capacity　of　sodium-ion　batteries.　(C)　2020　Elsevier　Ltd.　All　rights　reserved.