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Journal article
The role of electronic and ionic conductivities in the rate performance of tunnel structured manganese oxides in Li-ion batteries
APL materials, v 4(4), pp 46108-046108-11
01 Apr 2016
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Single nanowires of two manganese oxide polymorphs (alpha-MnO2 and todorokite manganese oxide), which display a controlled size variation in terms of their square structural tunnels, were isolated onto nanofabricated platforms using dielectrophoresis. This platform allowed for the measurement of the electronic conductivity of these manganese oxides, which was found to be higher in alpha-MnO2 as compared to that of the todorokite phase by a factor of similar to 46. Despite this observation of substantially higher electronic conductivity in alpha-MnO2, the todorokite manganese oxide exhibited better electrochemical rate performance as a Li-ion battery cathode. The relationship between this electrochemical performance, the electronic conductivities of the manganese oxides, and their reported ionic conductivities is discussed for the first time, clearly revealing that the rate performance of these materials is limited by their Li+ diffusivity, and not by their electronic conductivity. This result reveals important new insights relevant for improving the power density of manganese oxides, which have shown promise as a low-cost, abundant, and safe alternative for next-generation cathode materials. Furthermore, the presented experimental approach is suitable for assessing a broader family of one-dimensional electrode active materials (in terms of their electronic and ionic conductivities) for both Li-ion batteries and for electrochemical systems utilizing charge-carrying ions beyond Li+. (C) 2016 Author(s).
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Details
- Title
- The role of electronic and ionic conductivities in the rate performance of tunnel structured manganese oxides in Li-ion batteries
- Creators
- B. W. Byles - Drexel UniversityN. K. R. Palapati - Virginia Commonwealth UniversityA. Subramanian - Virginia Commonwealth UniversityE. Pomerantseva - Drexel UniversityNational Nuclear Security Administration, North Las Vegas, NV (United States)
- Publication Details
- APL materials, v 4(4), pp 46108-046108-11
- Publisher
- American Institute of Physics
- Number of pages
- 11
- Grant note
- 1453966 / National Science Foundation; National Science Foundation (NSF) DE-AC04-94AL85000 / U.S. Department of Energy's National Nuclear Security Administration; National Nuclear Security Administration Drexel University start-up funds
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000375846100011
- Scopus ID
- 2-s2.0-84968611374
- Other Identifier
- 991019168281504721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Applied