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Title: Na2Ti3O7 Nanoplatelets and Nanosheets Derived from a Modified Exfoliation Process for Use as a High-Capacity Sodium-Ion Negative Electrode

Journal Article · · ACS Applied Materials and Interfaces

The increasing interest in Na-ion batteries (NIBs) can be traced to sodium abundance, its low cost compared to lithium, and its intercalation chemistry being similar to that of lithium. We report that the electrochemical properties of a promising negative electrode material, Na2Ti3O7, are improved by exfoliating its layered structure and forming 2D nanoscale morphologies, nanoplatelets, and nanosheets. Exfoliation of Na2Ti3O7 was carried out by controlling the amount of proton exchange for Na+ and then proceeding with the intercalation of larger cations such as methylammonium and propylammonium. An optimized mixture of nanoplatelets and nanosheets exhibited the best electrochemical performance in terms of high capacities in the range of 100–150 mA h g–1 at high rates with stable cycling over several hundred cycles. These properties far exceed those of the corresponding bulk material, which is characterized by slow charge-storage kinetics and poor long-term stability. The results reported in this study demonstrate that charge-storage processes directed at 2D morphologies of surfaces and few layers of sheets are an exciting direction for improving the energy and power density of electrode materials for NIBs.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC)
Grant/Contract Number:
N00014-13-1-0605; N00014-16-1-2164; AC02-06CH11357; GUP-45245
OSTI ID:
1372243
Journal Information:
ACS Applied Materials and Interfaces, Vol. 9, Issue 2; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 52 works
Citation information provided by
Web of Science

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Cited By (11)

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Boosting Sodium Storage of Double-Shell Sodium Titanate Microspheres Constructed from 2D Ultrathin Nanosheets via Sulfur Doping journal October 2018
Ti‐Based Oxide Anode Materials for Advanced Electrochemical Energy Storage: Lithium/Sodium Ion Batteries and Hybrid Pseudocapacitors journal December 2019
Na 2 Ti 3 O 7 /C Nanofibers for High-Rate and Ultralong-Life Anodes in Sodium-Ion Batteries journal September 2018
Introduction of Fe 2+ in Fe 0.8 Ti 1.2 O 4 0.8− nanosheets via photo reduction and their enhanced electrochemical performance as a lithium ion battery anode journal January 2019
Comprehensive New Insights and Perspectives into Ti-Based Anodes for Next-Generation Alkaline Metal (Na + , K + ) Ion Batteries journal August 2018
Sodium storage in a promising MoS 2 –carbon anode: elucidating structural and interfacial transitions in the intercalation process and conversion reactions journal January 2018
Understanding Fundamentals and Reaction Mechanisms of Electrode Materials for Na-Ion Batteries journal January 2018
Advanced Nanostructured Anode Materials for Sodium-Ion Batteries journal September 2017
Hydrogen plasma reduced potassium titanate as a high power and ultralong lifespan anode material for sodium-ion batteries journal January 2018
Red blood cell-like hollow carbon sphere anchored ultrathin Na 2 Ti 3 O 7 nanosheets as long cycling and high rate-performance anodes for sodium-ion batteries journal January 2018

Figures / Tables (7)