Electrochemical behavior and self-organization of porous Sn nanocrystals@acetylene black microspheres in lithium-ion half cells

Meiqing Guo, Weijia Meng, Xiaogang Zhang, Xiao Liu, Zhongchao Bai, Shuai Chen, Zhihua Wang, Fuqian Yang

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We report a facile route to synthesize porous Sn nanocrystals@acetylene black microspheres (Sn@AB MSs) via a galvanic replacement reaction of Zn microspheres in a SnCl 2 solution consisting of acetylene black (AB). The half cells of lithium-ion batteries with the Sn@AB MSs as the working electrode have a charge capacity of 480.8 mA h g −1 at 100 mA g −1 after 100 cycles, and the charge capacity of the half cells after the 100th cycle is slightly larger than that after the 80th cycle. The SEM images reveal that the electrode layer from the Sn@AB MSs experiences surface cracking during electrochemical cycling, while prolonged cycling leads to the closure of cracks. Electrochemical cycling induces self-organization of Sn and AB to form rose-like porous Sn@AB/Li 2 SnO 3 microflowers from porous Sn@AB MSs. The closure of cracks and formation of porous Sn@AB/Li 2 SnO 3 microflowers likely cause the increase of the charge capacity. The experimental results demonstrate that the porous Sn@AB MSs with acetylene black around Sn can alleviate the large volumetric strain due to lithiation/delithiation, reduce the migration distance of lithium to active sites, and promote exceptional Li storage, leading to better cycling stability.

Original languageEnglish
Pages (from-to)36-43
Number of pages8
JournalApplied Surface Science
Volume470
DOIs
StatePublished - Mar 15 2019

Bibliographical note

Publisher Copyright:
© 2018

Keywords

  • Acetylene black
  • Anode
  • Li-storage mechanism
  • Lithium-ion batteries
  • Sn nanocrystals

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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