Details

Autor(en) / Beteiligte

• Huang, Huawen
• Wang, Jiuwu
• Yang, Xianfeng
• Hu, Renzong
• Liu, Jinlong
• Zhang, Lei
• Zhu, Min

Titel

Unveiling the Advances of Nanostructure Design for Alloy‐Type Potassium‐Ion Battery Anodes via In Situ TEM

Ist Teil von

• Angewandte Chemie International Edition, 2020-08, Vol.59 (34), p.14504-14510

Auflage

International ed. in English

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Nanostructure design and in situ transmission electron microscopy (TEM) are combined to demonstrate Sb‐based nanofibers composed of bunched yolk–shell building units as a significantly improved anode for potassium‐ion batteries (PIBs). Particularly, a metal–organic frameworks (MOFs)‐engaged electrospinning strategy coupled to a confined ion‐exchange followed by a subsequent thermal reduction is proposed to fabricate yolk–shell Sb@C nanoboxes embedded in carbon nanofibers (Sb@CNFs). In situ TEM analysis reveals that the inner Sb nanoparticles undergo a significant volume expansion/contraction during the alloying/dealloying processes, while the void space can effectively relieve the overall volume change, and the plastic carbon shell maintains the structural integrity of electrode material. This work provides an important reference for the application of advanced characterization techniques to guide the optimization of electrode material design. Combining structural design and in situ TEM characterization reveals the advances of nanostructure design of alloy‐type anodes for potassium‐ion batteries, leading to electrode materials with improved performance. In situ TEM revealed that the optimized design of electrode structure effectively accommodates huge volume changes of Sb nanoparticles during potassiation/depotassiation processes.