标题：Micron-Sized Nanoporous Antimony with Tunable Porosity for High-Performance Potassium-Ion Batteries
作者：An, Yongling; Tian, Yuan; Ci, Lijie; Xiong, Shenglin; Feng, Jinkui; Qian, Yitai
作者机构：[An, Yongling; Tian, Yuan; Ci, Lijie; Feng, Jinkui] Shandong Univ, SDU, Jinan 250061, Shandong, Peoples R China.; [An, Yongling; Tian, Yuan; Ci, Lij 更多
通讯作者：Feng, JK;Feng, JK;Feng, Jinkui
通讯作者地址：[Feng, JK]Shandong Univ, SDU, Jinan 250061, Shandong, Peoples R China;[Feng, JK]Shandong Univ, Sch Mat Sci & Engn, Key Lab Liquid Solid Struct Evolut 更多
关键词：potassium-ion batteries; nanoporous antimony; micron-sized; tunable; porosity; vacuum distillation; anode
摘要：Potassium-ion batteries (KIBs) are considered favorable candidates for post-lithium-ion batteries, a quality attributed to their low cost, abundance as a resource, and high working potential (-2.93 V for K+/K). Owning to its relatively low potassiation potential and high theoretical capacity, antimony (Sb) is one of the most favorable anodes for KIBs. However, the large volume changes during K-Sb alloying and dealloying causes fast capacity degradation. In this report, nanoporous Sb (NP-Sb) is fabricated by an environmentally friendly vacuum-distillation method. The NP-Sb is formed via evaporating low-boiling-point zinc (Zn). The byproduct Zn can be recycled. It is further found that the morphology and porosity can be controlled by adjusting Zn-Sb composition and distillation temperature. The nanoporous structure can accommodate volume expansion and accelerate ion transport. The NP-Sb anode delivers an improved electrochemical performance. These results suggest that the vacuum-distillation method may provide a direction for the green, large-scale, and tunable fabrication of nanoporous materials.