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Most potassium-ion battery (PIB) cathode materials have deficient structural stability because of the huge radius of potassium ion, leading to inferior cycling performance.W e report the controllable synthesis of an ovel low-strain phosphate material K 3 (VO)(HV 2 O 3 )(PO 4 ) 2 (HPO 4 )(denoted KVP) nanorulers as an efficient cathode for PIBs.The as-synthesized KVP nanoruler cathode exhibits an initial reversible capacity of 80.6 mAh g À1 under 20 mA g À1 ,with alarge average working potential of 4.11 V. It also manifests an excellent rate property of 54.4 mAh g À1 under 5Ag À1 ,w ith ah igh capacity preservation of 92.1 %o ver2 500 cycles.T he outstanding potassium storage capability of KVP nanoruler cathode originates from al ow-strain K + uptake/removal mechanism, inherent semiconductor characteristic,a nd small K + migration energy barrier.The high energy density and prolonged cyclic stability of KVP nanorulers//polyaniline-intercalated layered titanate full battery verifies the superiority of KVP nanoruler cathode in PIBs.

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