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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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [1];  [1]; ORCiD logo [1];  [1]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Univ. of California, Santa Barbara, CA (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC)
OSTI Identifier:
1372243
Grant/Contract Number:  
N00014-13-1-0605; N00014-16-1-2164; AC02-06CH11357; GUP-45245
Resource Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 9; Journal Issue: 2; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; 25 ENERGY STORAGE; 2D materials; anode; electrochemistry; high rate; Na-ion battery; nanomaterials

Citation Formats

Ko, Jesse S., Doan-Nguyen, Vicky V. T., Kim, Hyung-Seok, Muller, Guillaume A., Serino, Andrew C., Weiss, Paul S., and Dunn, Bruce S. Na2Ti3O7 Nanoplatelets and Nanosheets Derived from a Modified Exfoliation Process for Use as a High-Capacity Sodium-Ion Negative Electrode. United States: N. p., 2016. Web. https://doi.org/10.1021/acsami.6b10790.
Ko, Jesse S., Doan-Nguyen, Vicky V. T., Kim, Hyung-Seok, Muller, Guillaume A., Serino, Andrew C., Weiss, Paul S., & Dunn, Bruce S. Na2Ti3O7 Nanoplatelets and Nanosheets Derived from a Modified Exfoliation Process for Use as a High-Capacity Sodium-Ion Negative Electrode. United States. https://doi.org/10.1021/acsami.6b10790
Ko, Jesse S., Doan-Nguyen, Vicky V. T., Kim, Hyung-Seok, Muller, Guillaume A., Serino, Andrew C., Weiss, Paul S., and Dunn, Bruce S. Tue . "Na2Ti3O7 Nanoplatelets and Nanosheets Derived from a Modified Exfoliation Process for Use as a High-Capacity Sodium-Ion Negative Electrode". United States. https://doi.org/10.1021/acsami.6b10790. https://www.osti.gov/servlets/purl/1372243.
@article{osti_1372243,
title = {Na2Ti3O7 Nanoplatelets and Nanosheets Derived from a Modified Exfoliation Process for Use as a High-Capacity Sodium-Ion Negative Electrode},
author = {Ko, Jesse S. and Doan-Nguyen, Vicky V. T. and Kim, Hyung-Seok and Muller, Guillaume A. and Serino, Andrew C. and Weiss, Paul S. and Dunn, Bruce S.},
abstractNote = {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.},
doi = {10.1021/acsami.6b10790},
journal = {ACS Applied Materials and Interfaces},
number = 2,
volume = 9,
place = {United States},
year = {2016},
month = {12}
}

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