Sb2S3-based conversion-alloying dual mechanism anode for potassium-ion batteries

Shaokun Chong, Shuangyan Qiao, Xuedong Wei, Ting Li, Lingling Yuan, Shihong Dong, Wei Huang

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

The 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, Sb2S3 nanorods 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−1 at 50 mA·g−1 and a great cycle stability with the lifetime over 200 cycles at 200 mA·g−1. Ex situ XRD, 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.

Original languageEnglish
Article number103494
JournaliScience
Volume24
Issue number12
DOIs
StatePublished - 17 Dec 2021

Keywords

  • Electrochemistry
  • Energy storage
  • Materials science

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