文章基本信息

标题：Sb 2S 3-based conversion-alloying dual mechanism anode for potassium-ion batteries
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作者：Shaokun Chong ; Shuangyan Qiao ; Xuedong Wei 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2021
卷号：24
期号：12
页码：1-15
DOI：10.1016/j.isci.2021.103494
语种：English
出版社：Elsevier
摘要：SummaryThe large volume expansion and sluggish dynamic behavior are the key bottleneck to suppress the development of conversion-alloying dual mechanism anode for potassium-ion batteries (PIBs). Herein, Sb2S3nanorods encapsulated by reduced graphene oxide and nitrogen-doped carbon (Sb2S3@rGO@NC) are constructed as anodes for PIBs. The synergistic effect of dual physical protection and robust C-Sb chemical bonding boosts superior electrochemical kinetics and great electrode stability. Thus, Sb2S3@rGO@NC exhibits a high initial charge capacity of 505.6 mAh·g−1at 50 mA·g−1and a great cycle stability with the lifetime over 200 cycles at 200 mA·g−1.Ex situXRD, XPS, and TEM characterizations confirm that the electrode undergoes a multielectron transfer process (Sb2S3↔ Sb + K2S ↔ KSb + K3Sb), where K-ion insert into/extract from the material via dual mechanisms of conversion and alloying. This work sheds a light on the construction of high-performance anode materials and the understanding of K-ion storage mechanism.Graphical abstractDisplay OmittedHighlights•Sb2S3nanorods encapsulated by graphene and C are constructed as anodes for PIBs•The conversion-alloying dual mechanisms are uncovered byex situtests•Sb2S3@rGO@NC exhibits great electrochemical performances for PIBs•The physical protection and chemical bonding boost superior electrode stabilityElectrochemistry; Energy storage; Materials science