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Title: Todorokite-type manganese oxide nanowires as an intercalation cathode for Li-ion and Na-ion batteries

Journal Article · · RSC Advances
DOI:https://doi.org/10.1039/C5RA20624C· OSTI ID:1265902
 [1];  [1];  [2];  [2];  [1]
  1. Drexel Univ., Philadelphia, PA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
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Extended hydrothermal treatment at an elevated temperature of 220 °C allowed high yield synthesis of manganese oxide nanowires with a todorokite crystal structure suitable for ions intercalation. The flexible, high aspect ratio nanowires are 50–100 nm in diameter and up to several microns long, with 3 × 3 structural tunnels running parallel to the nanowire longitudinal axis. Moreover, the tunnels are occupied by magnesium ions and water molecules, with the chemical composition found to be Mg0.2MnO2·0.5H2O. The todorokite nanowires were, for the first time, electrochemically tested in both Li-ion and Na-ion cells. A first discharge capacity of 158 mA h g-1 was achieved in a Na-ion system, which was found to be greater than the first discharge capacity in a Li-ion system (133 mA h g-1). In spite of the large structural tunnel dimensions, todorokite showed a significant first cycle capacity loss in a Na-ion battery. After 20 cycles, the capacity was found to stabilize around 50 mA h g-1 and remained at this level for 100 cycles. In a Li-ion system, todorokite nanowires showed significantly better capacity retention with 78% of its initial capacity remaining after 100 cycles. Rate capability tests also showed superior performance of todorokite nanowires in Li-ion cells compared to Na-ion cells at higher current rates. Finally, these results highlight the difference in electrochemical cycling behavior of Li-ion and Na-ion batteries for a host material with spacious 3 × 3 tunnels tailored for large Na+ ion intercalation.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265902
Journal Information:
RSC Advances, Vol. 5, Issue 128; ISSN 2046-2069
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (5)

Visualization of lithium-ion transport and phase evolution within and between manganese oxide nanorods journal May 2017
In situ approach of cementite nanoparticles encapsulated with nitrogen-doped graphitic shells as anode nanomaterials for Li-ion and Na-ion batteries journal January 2018
The role of electronic and ionic conductivities in the rate performance of tunnel structured manganese oxides in Li-ion batteries journal April 2016
Brittle fracture to recoverable plasticity: Polytypism-dependent nanomechanics in todorokite-like nanobelts text January 2021
Brittle fracture to recoverable plasticity: Polytypism-dependent nanomechanics in todorokite-like nanobelts text January 2021

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