Enabling Superior Electrochemical Properties for Highly Efficient Potassium Storage by Impregnating Ultrafine Sb Nanocrystals within Nanochannel‐Containing Carbon Nanofibers. (4th September 2019)

• Record Type: Journal Article
• Authors: Ge, Xufang; Liu, Shuhu; Qiao, Man; Du, Yichen; Li, Yafei; Bao, Jianchun; Zhou, Xiaosi
• Is Part Of: Angewandte Chemie. Volume 131:Number 41(2019)
• Page Start: 14720
• Page End: 14725
• Publication Date: 2019-09-04
• Subjects: Kohlenstoff-Nanofasern -- Energiespeicherung -- Nanokanäle -- Kalium-Ionen-Batterien -- Sb-Nanokristalle; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201908918
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Sb‐based nanocomposites are attractive anode materials for batteries as they exhibit large theoretical capacity and impressive working voltage. However, tardy potassium ion diffusion characteristics, unstable Sb/electrolyte interphase, and huge volume variation pose a challenge, hindering their practical use for potassium‐ion batteries (PIBs). Now, a simple robust strategy is presented for uniformly impregnating ultrasmall Sb nanocrystals within carbon nanofibers containing an array of hollow nanochannels (denoted u‐Sb@CNFs), resolving the issues above and yielding high‐performance PIBs. u‐Sb@CNFs can be directly employed as an anode, thereby dispensing with the need for conductive additives and binders. Such a judiciously crafted u‐Sb@CNF‐based anode renders a set of intriguing electrochemical properties, representing large charge capacity, unprecedented cycling stability, and outstanding rate performance. A reversible capacity of 225 mAh g −1 is retained after 2000 cycles at 1 A g −1 . Abstract : Hocheffizient : Sb‐Nanokristalle wurden gleichmäßig in Kohlenstoff‐Nanofasern imprägniert, die eine Anordnung von Nanokanälen enthalten (u‐Sb@CNFs). Als Anode für Kalium‐Ionen‐Batterien zeigt u‐Sb@CNFs eine hohe spezifische Kapazität, außerordentliche Raten‐Eigenschaften und eine stabile Zyklenfestigkeit.