Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

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

A Robust Route to Co2(OH)2CO3 Ultrathin Nanosheets with Superior Lithium Storage Capability... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Energy Materials Wiley

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

Loading next page...
 
/lp/wiley/a-robust-route-to-co2-oh-2co3-ultrathin-nanosheets-with-superior-T0UW06iel3

References (49)

Publisher
Wiley
Copyright
© 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
1614-6832
eISSN
1614-6840
DOI
10.1002/aenm.201901093
Publisher site
See Article on Publisher Site

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.

Journal

Advanced Energy MaterialsWiley

Published: Jul 1, 2019

Keywords: ; ; ; ;

There are no references for this article.