In Situ Synthesis of the Peapod-Like Cu–SnO2@Copper Foam as Anode with Excellent Cycle Stability and High Area Specific Capacity

Wenbo Liu, Bobo Lu, Xiangjiang Liu, Yi Gan, Shichao Zhang, Sanqiang Shi

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)

Abstract

The theoretical specific capacity of tin oxide (SnO2) anode material is more than twice that of graphite material (782 vs 372 mAh g–1), whereas its potential usage is limited fatally by its huge volume expansion during lithiation. An effective solution is to encapsulate tin oxide into hollow structure such as yolk-shell based on the principle of confinement. However, in light of the restricted space of active substance, this kind of hollow electrode always has the low capacity, severely limiting its commercial value. Herein, a peapod-like Cu-SnO2@copper foam (CF) as high area specific capacity anode based on the Kirkendall effect, in which the “pod and peas” in the peapod-like structure are composed of SnO2 and Cu nanoparticles, respectively, is tactfully designed and constructed. Compared to other SnOx-based electrodes with different hollow structure designs in published reports, the unique peapod-like Cu-SnO2@CF anode delivers a remarkably high first reversible capacity of 5.80 mAh cm-2 as well as excellent cycle stability with 66.7% capacity retention and ≈100% coulombic efficiency after 200 cycles at a current density of 1 mA cm–2, indicative of its quite promising application toward high-performance lithium-ion batteries.

Original languageEnglish
Article number2101999
JournalAdvanced Functional Materials
Volume31
Issue number33
DOIs
Publication statusPublished - 16 Aug 2021

Keywords

  • Cu–SnO @copper foam
  • high area specific capacity
  • in situ synthesis
  • peapod-like structures
  • the Kirkendall effect

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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