Anode materials with conversion-alloying dual mechanism are crucial for the development of high energy density potassium-ion batteries (PIBs), while large volume expansion and poor dynamic behavior hinder its development. Herein, nanoplate-structured Sb₂Te₃ anchored on graphene and N-doped C (Sb₂Te₃@rGO@NC) is regarded as anode material for PIBs for the first time. The dual encapsulation effect of Sb₂Te₃@rGO@NC composite with strong chemical bonding of Sb—C can not only significantly restrain the large volume expansion to maintain the electrode integrity, but also efficiently enhance the electronic transfer, K-ion adsorption and diffusion ability, verified by first principles calculations and electrochemical kinetics study. As a result, the resultant Sb₂Te₃@rGO@NC electrode delivers a high initial charge specific capacity of 384.9 mAh·g⁻¹ at 50 mA·g⁻¹, great rate capability and long-term lifetime over 200 cycles at 200 mA·g⁻¹. Ex situ TEM and XPS results clarify that the electrode undergoes typical conversion-alloying dual-mechanisms with 12 mol K-ion transfer per formula employing Sb-ion as redox site (Sb₂Te₃ + 12 K⁺ + 12e^- ↔ 3K₂Te + 2K₃Sb). This work could pave the way for the fast development of Sb₂Te₃-based anode for PIBs, and help to understand the K-ion storage mechanism.

具有转化-合金化双重机制的负极材料对于高能量密度钾离子电池（PIBs）的发展至关重要，而大体积膨胀和较差的动力学行为阻碍了其发展。在此，锚定在石墨烯和N掺杂 C 上的纳米片结构 Sb ₂ Te ₃ (Sb ₂ Te ₃ @rGO@NC) 首次被视为 PIB 的负极材料。_{Sb 2} Te ₃的双重包封效应@rGO@NC 具有强Sb—C 化学键的复合材料不仅可以显着抑制大体积膨胀以保持电极完整性，而且可以有效增强电子转移、K 离子吸附和扩散能力，通过第一性原理计算和验证电化学动力学研究。因此，所得 Sb ₂ Te ₃ @rGO@NC 电极在 50 mA·g ^{-1时具有 384.9 mAh·g -1}的高初始充电比容量，在 200 时具有出色的倍率性能和超过 200 个循环的长期寿命毫安·克^-1。异地TEM 和 XPS 结果表明，电极经历了典型的转化合金化双重机制，每个配方使用 Sb 离子作为氧化还原位点 (Sb 2 Te 3 + 12 K + + 12e - ↔ 3K 2 _Te + _2K  )^进行12 ^mol K_离子转移₃锑）。_{这项工作可为基于 Sb 2} Te ₃的 PIB 负极的快速开发铺平道路，并有助于理解 K 离子存储机制。