Ultralong K 0.5 Mn 0.75 PS 3 Nanowires Tailored by K‐Ion Scissors for Extraordinary Sodium‐Ion Storage

作者：Xueyang Tu, Hengyue Xu, Youtan Pan, Zhuoran Lv, Linlin Wang, Bingyi Zhu, Tianquan Lin, Hui Bi, Yuqiang Fang, Fuqiang Huang · 发表于：Advanced Materials · 年份：2024 · DOI：10.1002/adma.202408963 · 被引用次数：10 · 研究领域：Advancements in Battery Materials、MXene and MAX Phase Materials、Supercapacitor Materials and Fabrication

Abstract 1D 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 K 0.5 Mn 0.75 PS 3 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 ([MnS 3 ] 4− framework). Stress‐driven K‐ion scissors achieve the rapid transformation of MnPS 3 bulk to K 0.5 Mn 0.75 PS 3 NWs with directed tailoring. Compared to MnPS 3 , 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.