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Title: Silver-Containing α-MnO 2 Nanorods: Electrochemistry in Na-Based Battery Systems

Manganese oxides are considered attractive cathode materials for rechargeable batteries due to the high abundance and environmental friendliness of manganese. In particular, cryptomelane and hollandite are desirable due to their ability to host cations within their octahedral molecular sieve (OMS-2) Alpha-MnO 2 structure. In this work, we investigate silver containing Alpha-MnO 2 structured materials (Ag xMn 8O 16, x = 1.22, L-Ag-OMS-2 or 1.66, H-Ag-OMS-2) as host materials for Li ion and Na ion insertion/de-insertion. The results indicate a significant difference in the lithiation versus sodiation process the OMS-2 materials. Initial reduction of Ag 1.22Mn 8O 16 to 1.0 V delivered ~370 mAh/g. Cycling of Ag1.22Mn8O16 between voltage ranges of 3.8 - 1.7 V and 3.8 - 1.3 V in a Na battery delivered initial capacities of 113 and 247 mAh/g, respectively. In contrast, Ag1.66Mn8O16 delivered only 15 mAh/g, ~0.5 electron equivalents, to 1.7 and 1.3 volts. Study of the system by electrochemical impedance spectroscopy (EIS) showed a significant decrease in charge transfer resistance from 2029 Omega to 594 Omega after 1.5 electron equivalents per Ag 1.22Mn 8O 16 formula unit of Na ion insertion. In contrast, both Ag 1.22Mn 8O 16 and Ag 1.66Mn 8O 16 exhibited gradual impedancemore » increases during lithiation. The formation of silver metal could be detected only in the sodiated material by X-ray diffraction (XRD). Thus, the impedance of Ag-OMS-2 decreases upon sodiation coincident with the formation of silver metal during the discharge process, consistent with the more favorable formation of silver metal during the sodiation process relative to the lithation process.« less
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [1] ;  [1] ;  [3]
  1. Stony Brook Univ., NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States)
Publication Date:
Report Number(s):
BNL-113936-2017-JAAM
Journal ID: ISSN 1944-8244
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 9; Journal Issue: 5; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE
OSTI Identifier:
1439851

Huang, Jianping, Poyraz, Altug S., Lee, Seung-Yong, Wu, Lijun, Zhu, Yimei, Marschilok, Amy C., Takeuchi, Kenneth J., and Takeuchi, Esther S.. Silver-Containing α-MnO2 Nanorods: Electrochemistry in Na-Based Battery Systems. United States: N. p., Web. doi:10.1021/acsami.6b08549.
Huang, Jianping, Poyraz, Altug S., Lee, Seung-Yong, Wu, Lijun, Zhu, Yimei, Marschilok, Amy C., Takeuchi, Kenneth J., & Takeuchi, Esther S.. Silver-Containing α-MnO2 Nanorods: Electrochemistry in Na-Based Battery Systems. United States. doi:10.1021/acsami.6b08549.
Huang, Jianping, Poyraz, Altug S., Lee, Seung-Yong, Wu, Lijun, Zhu, Yimei, Marschilok, Amy C., Takeuchi, Kenneth J., and Takeuchi, Esther S.. 2016. "Silver-Containing α-MnO2 Nanorods: Electrochemistry in Na-Based Battery Systems". United States. doi:10.1021/acsami.6b08549. https://www.osti.gov/servlets/purl/1439851.
@article{osti_1439851,
title = {Silver-Containing α-MnO2 Nanorods: Electrochemistry in Na-Based Battery Systems},
author = {Huang, Jianping and Poyraz, Altug S. and Lee, Seung-Yong and Wu, Lijun and Zhu, Yimei and Marschilok, Amy C. and Takeuchi, Kenneth J. and Takeuchi, Esther S.},
abstractNote = {Manganese oxides are considered attractive cathode materials for rechargeable batteries due to the high abundance and environmental friendliness of manganese. In particular, cryptomelane and hollandite are desirable due to their ability to host cations within their octahedral molecular sieve (OMS-2) Alpha-MnO2 structure. In this work, we investigate silver containing Alpha-MnO2 structured materials (AgxMn8O16, x = 1.22, L-Ag-OMS-2 or 1.66, H-Ag-OMS-2) as host materials for Li ion and Na ion insertion/de-insertion. The results indicate a significant difference in the lithiation versus sodiation process the OMS-2 materials. Initial reduction of Ag1.22Mn8O16 to 1.0 V delivered ~370 mAh/g. Cycling of Ag1.22Mn8O16 between voltage ranges of 3.8 - 1.7 V and 3.8 - 1.3 V in a Na battery delivered initial capacities of 113 and 247 mAh/g, respectively. In contrast, Ag1.66Mn8O16 delivered only 15 mAh/g, ~0.5 electron equivalents, to 1.7 and 1.3 volts. Study of the system by electrochemical impedance spectroscopy (EIS) showed a significant decrease in charge transfer resistance from 2029 Omega to 594 Omega after 1.5 electron equivalents per Ag1.22Mn8O16 formula unit of Na ion insertion. In contrast, both Ag1.22Mn8O16 and Ag1.66Mn8O16 exhibited gradual impedance increases during lithiation. The formation of silver metal could be detected only in the sodiated material by X-ray diffraction (XRD). Thus, the impedance of Ag-OMS-2 decreases upon sodiation coincident with the formation of silver metal during the discharge process, consistent with the more favorable formation of silver metal during the sodiation process relative to the lithation process.},
doi = {10.1021/acsami.6b08549},
journal = {ACS Applied Materials and Interfaces},
number = 5,
volume = 9,
place = {United States},
year = {2016},
month = {9}
}