A Robust Route to Co2(OH)2CO3 Ultrathin Nanosheets with Superior Lithium Storage Capability Templated by Aspartic Acid-Functionalized Graphene Oxide

Shiqiang Zhao, Zewei Wang, Yanjie He, Hongrui Jiang, Yeu Wei Harn, Xueqin Liu, Chenliang Su, Huile Jin, Ying Li, Shun Wang, Qiang Shen, Zhiqun Lin

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

Abstract

Two-dimensional (2D) nanomaterials are widely recognized as an important class of functional materials possessing superior electrochemical reaction kinetics. Herein, an L-aspartic acid (AA)-modified graphene oxide (GO) templating strategy is developed to in situ yield ultrathin (i.e., ≈5 nm) cobalt carbonate hydroxide (Co2(OH)2CO3) nanosheets as advanced anode materials of lithium ion batteries. Notably, the covalent tethering of AA on the GO surface renders a high density of carboxyl groups that impart effective loading of Co-containing precursors and subsequent growth into Co2(OH)2CO3 nanosheets bridging adjacent GO layers. The lasagna-like Co2(OH)2CO3-GO nanocomposites exhibit an ultrahigh lithium storage capacity of 1770 mAh g−1 after 500 cycles at 100 mA g−1. It is noteworthy that the cycled Co2(OH)2CO3 phase separates into homogeneously dispersed Co(OH)2 and CoCO3 phases with two different charge plateaus at ≈1.2 and 2.0 V, respectively, which effectively inhibit large-scale homophase coarsening of Co, Li2CO3, and LiOH. The much shortened Li+/e transfer distance enabled by individual ultrathin Co2(OH)2CO3 nanosheet together with robust layer-by-layer assembled nanostructure of Co2(OH)2CO3-GO confers the superior electrochemical reactivity and mechanical stability. As such, the amino acid-modified GO templating strategy may represent a simple yet robust means of crafting a variety of 2D nanostructured composites of interest for energy storage applications.

Original languageEnglish
Article number1901093
JournalAdvanced Energy Materials
Volume9
Issue number26
DOIs
StatePublished - 12 Jul 2019

Bibliographical note

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • amino acid-modified graphene oxide
  • cobalt carbonate hydroxide (Co(OH)CO)
  • lithium ion batteries
  • templated growth
  • ultrathin nanosheet

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