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Title: Band diagram and rate analysis of thin film spinel LiMn2O4 formed by electrochemical conversion of ALD-grown MnO

Journal Article · · Advanced Functional Materials
 [1];  [2];  [3];  [1];  [1]
  1. Univ. of Colorado, Boulder, CO (United States)
  2. Leupold-Institut fur Angewandte Naturwissenschaften, Zwickau (Germany)
  3. Univ. of Colorado, Boulder, CO (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)

Nanoscale spinel lithium manganese oxide is of interest as a high-rate cathode material for advanced battery technologies among other electrochemical applications. In this work, the synthesis of ultrathin films of spinel lithium manganese oxide (LiMn2O4) between 20 and 200 nm in thickness by room-temperature electrochemical conversion of MnO grown by atomic layer deposition (ALD) is demonstrated. The charge storage properties of LiMn2O4 thin films in electrolytes containing Li+, Na+, K+, and Mg2+ are investigated. A unified electrochemical band-diagram (UEB) analysis of LiMn2O4 informed by screened hybrid density functional theory calculations is also employed to expand on existing understanding of the underpinnings of charge storage and stability in LiMn2O4. It is shown that the incorporation of Li+ or other cations into the host manganese dioxide spinel structure (λ-MnO2) stabilizes electronic states from the conduction band which align with the known redox potentials of LiMn2O4. Furthermore, the cyclic voltammetry experiments demonstrate that up to 30% of the capacity of LiMn2O4 arises from bulk electronic charge-switching which does not require compensating cation mass transport. As a result, the hybrid ALD-electrochemical synthesis, UEB analysis, and unique charge storage mechanism described here provide a fundamental framework to guide the development of future nanoscale electrode materials for ion-incorporation charge storage.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Next Generation of Materials by Design: Incorporating Metastability (CNGMD)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC36-08GO28308; AC36-99GO10337
OSTI ID:
1333410
Report Number(s):
NREL/JA-5K00-67263
Journal Information:
Advanced Functional Materials, Vol. 26, Issue 43; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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The Unified Electrochemical Band Diagram Framework: Understanding the Driving Forces of Materials Electrochemistry journal August 2018
Modulation of the Optical Properties of Lithium Manganese Oxide via Li-Ion De/Intercalation journal April 2018
Unveiling Conversion Reaction on Intercalation-Based Transition Metal Oxides for High Power, High Energy Aqueous Lithium Battery journal October 2018
Discovery of Anion Insertion Electrochemistry in Layered Hydroxide Nanomaterials journal February 2019
Growth behavior, work function, and band gap tuning of nanocrystalline LiMn 2 O 4 thin films journal August 2019
Efficient Capacitive Deionization Using Thin Film Sodium Manganese Oxide journal January 2018
Unveiling Conversion Reaction on Intercalation‐Based Transition Metal Oxides for High Power, High Energy Aqueous Lithium Battery journal July 2021

Figures / Tables (10)