Ultralong K0.5Mn0.75PS3 Nanowires Tailored by K‐Ion Scissors for Extraordinary Sodium‐Ion Storage

Abstract

Abstract1D layered nanowires (NWs) are expected to be excellent electrode materials due to their efficient electron/ion transport and strain/stress relaxation. However, it is a great challenge to synthesize layered NWs by a top‐down synthetic route. Herein, ultralong 1D layered K0.5Mn0.75PS3 NWs (length: >100 µm; diameter: ≈300 nm) are synthesized for the first time using “K‐ion chemical scissors”, whose excellent sodium storage performance originates from the bifunctional structural unit, ingeniously combining the alloying energy storage functional unit (P−P dimer) with the quasi‐intercalated functional unit ([MnS3]4− framework). Stress‐driven K‐ion scissors achieve the rapid transformation of MnPS3 bulk to K0.5Mn0.75PS3 NWs with directed tailoring. Compared to MnPS3, the NWs exhibit enlarged interlayer spacing (9.32 Å), enhanced electronic conductivity (8.17 × 10−5 S m−1 vs 4.47 × 10−10 S m−1), and high ionic conductivity (2.14 mS cm−1). As expected, the NWs demonstrate high capacity (709 mAh g−1 at 0.5 A g−1) and excellent cycling performance (≈100% capacity retention after 2500 cycles at 10 A g−1), ranking among metal thiophosphates. A quasi‐topological intercalation mechanism of the NWs is revealed through further characterizations. This work expands the top‐down synthesis approach and offers innovative insights for the cost‐effective and large‐scale fabrication of NWs with outstanding electrochemical performance.