Easy synthesis of multi-shelled ZnO hollow spheres and their conversion into hedgehog-like ZnO hollow spheres with superior rate performance for lithium ion batteries

Guanglei Wu, Zirui Jia, Yonghong Cheng, Hongxia Zhang, Xinfeng Zhou, Hongjing Wu

Research output: Contribution to journalArticlepeer-review

127 Scopus citations

Abstract

Herein, uniform multi-shelled ZnO hollow spheres were synthesized, especially hedgehog-like and triple-shelled ZnO hollow spheres were synthesized for the first time by a simple hydrothermal method capable of controlling the number of internal multishells, which are achieved by controlling the calcination process. Used as anodes for lithium ion batteries, the hedgehog-like ZnO hollow spheres show excellent rate capacity, good cycling performance, and high initial specific capacity. A superior capacity, up to 109 mAh g −1 with minimal irreversible capacity (i.e., coulomb efficiency of 99.1%) after 100 cycles is achieved at a current rate of 100 mA g −1 , and a capacity of 98.8 mAh g −1 is obtained at a current rate of 1 A g −1 . However, a high discharge of 253.6 mA h g −1 for the hedgehog-like ZnO hollow spheres can still be achieved when the current rate is reduced back to 100 mA g −1 .

Original languageEnglish
Pages (from-to)472-478
Number of pages7
JournalApplied Surface Science
Volume464
DOIs
StatePublished - 15 Jan 2019

Keywords

  • Hedgehog-like ZnO
  • Lithium ion batteries
  • Nanostructure
  • Synthesis

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