Atomically Dispersed Sn Incorporated into Carbon Matrix for Stable Electrochemical Lithium Storage

Qiongguang Li, Menglei Yuan, Yongjun Ji, Xiao Chen, Yanhong Wang*, Xingyue Gao, Huifang Li, Hongyan He, Han Chen, Qiangqiang Tan, Guangwen Xu, Ziyi Zhong, Fabing Su*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Although possessing a high specific capacity, the practical implementation of SnO2 nanoparticles as a promising anode for lithium-ion batteries (LIBs) is hampered by their poor cyclability. This work demonstrates that incorporating single atomic Sn (SASn) species into a carbon matrix can address this issue effectively. The SASn/C composite was synthesized via polymerization of formaldehyde and 3-aminophenol in the presence of Tin (II) chloride, followed by pyrolysis. The SASn atoms were homogeneously dispersed in the carbon matrix. Each Sn atom coordinated with two O and two C atoms, forming the Sn-O-C and Sn-C bonds, providing channels for fast electron/ion transfer and boosting electrochemical kinetics. The SASn/C anode exhibited unique lithium storage behaviors, enhanced lithium storage capability, and excellent cyclic stability with a capacity fading rate of 0.0031% per cycle at 1000 mA g-1 after 7000 cycles. Density functional theory calculations reveal that one SASn atom can adsorb three Li+ ions at the fully discharged state during the discharging process. Subsequently, the Li+ ions are directly desorbed from the SASn atom, which is different from the traditional multi-step de-alloying process. This facile strategy represents a significant advancement in developing high-performance Sn-based anode materials for LIBs.
Original languageEnglish
JournalChemical Engineering Journal
DOIs
StatePublished - 19 Feb 2022

Keywords

  • Single atom Sn
  • Cyclability
  • Lithium storage mechanism
  • Anode
  • Lithium-ion batteries

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