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Title: The role of electronic and ionic conductivities in the rate performance of tunnel structured manganese oxides in Li-ion batteries

Journal Article · · APL Materials
DOI:https://doi.org/10.1063/1.4948272· OSTI ID:1262340
 [1];  [2];  [2];  [1]
  1. Drexel Univ., Philadelphia, PA (United States)
  2. Virginia Commonwealth Univ., Richmond, VA (United States)

Single nanowires of two manganese oxide polymorphs (α-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 α-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 α-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. Moreover, 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+.

Research Organization:
National Nuclear Security Administration, North Las Vegas, NV (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Drexel University
OSTI ID:
1262340
Journal Information:
APL Materials, Vol. 4, Issue 4; ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Incorporating Ionic Paths into 3D Conducting Scaffolds for High Volumetric and Areal Capacity, High Rate Lithium-Metal Anodes journal July 2018
A 3D nanoelectrokinetic model for predictive assembly of nanowire arrays using floating electrode dielectrophoresis journal November 2018
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Brittle fracture to recoverable plasticity: Polytypism-dependent nanomechanics in todorokite-like nanobelts text January 2021
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