Interconnected Ni(HCO3)2 Hollow Spheres Enabled by Self-Sacrificial Templating with Enhanced Lithium Storage Properties

Shiqiang Zhao, Zewei Wang, Yanjie He, Beibei Jiang, Yeuwei Harn, Xueqin Liu, Faqi Yu, Fan Feng, Qiang Shen, Zhiqun Lin

Research output: Contribution to journalArticlepeer-review

104 Scopus citations

Abstract

Interconnected nickel bicarbonate (Ni(HCO3)2) hollow spheres were produced and exploited for the first time as an anode of lithium ion batteries, delivering the 80th reversible capacity of 1442 mAh g-1 at a current rate of 100 mA g-1, which is 3.9 times the theoretical capacity of commercial anode graphite. The time-dependent study suggested a self-sacrificial templating formation mechanism that yielded intriguing interconnected hollow structures. X-ray photoelectron spectroscopy measurements on cycled electrodes indicated that both the deep oxidation of Ni2+ into Ni3+ and the reversible reactions in HCO3 - accounted for the ultrahigh capacity of Ni(HCO3)2 in comparison to its generally accepted theoretical capacity of 297 mAh g-1. Morphological characterizations revealed that the interconnected hollow structures enabled the enhanced rate performance and cycling stability, compared to those of the solid counterpart, because of their larger contact areas with electrolyte and better buffering effect to accommodate the volume change.

Original languageEnglish
Pages (from-to)111-116
Number of pages6
JournalACS Energy Letters
Volume2
Issue number1
DOIs
StatePublished - 13 Jan 2017

Bibliographical note

Publisher Copyright:
© 2016 American Chemical Society.

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