Effectively suppressing dissolution of manganese from spinel lithium manganate via a nanoscale surface-doping approach

Jun Lu (), Chun Zhan, Tianpin Wu, Jianguo Wen, Yu Lei, A. Jeremy Kropf, Huiming Wu, Dean J. Miller, Jeffrey W. Elam, Yang-Kook Sun, Xinping Qiu () and Khalil Amine ()
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Jun Lu: Argonne National Laboratory
Chun Zhan: Argonne National Laboratory
Tianpin Wu: Argonne National Laboratory
Jianguo Wen: Electron Microscopy Center, Argonne National Laboratory
Yu Lei: University of Alabama in Huntsville
A. Jeremy Kropf: Argonne National Laboratory
Huiming Wu: Argonne National Laboratory
Dean J. Miller: Electron Microscopy Center, Argonne National Laboratory
Jeffrey W. Elam: Argonne National Laboratory
Yang-Kook Sun: Hanyang University
Xinping Qiu: Key Laboratory of Organic Optoelectronics and Molecular Engineering, Tsinghua University
Khalil Amine: Argonne National Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract The capacity fade of lithium manganate-based cells is associated with the dissolution of Mn from cathode/electrolyte interface due to the disproportionation reaction of Mn(III), and the subsequent deposition of Mn(II) on the anode. Suppressing the dissolution of Mn from the cathode is critical to reducing capacity fade of LiMn2O4-based cells. Here we report a nanoscale surface-doping approach that minimizes Mn dissolution from lithium manganate. This approach exploits advantages of both bulk doping and surface-coating methods by stabilizing surface crystal structure of lithium manganate through cationic doping while maintaining bulk lithium manganate structure, and protecting bulk lithium manganate from electrolyte corrosion while maintaining ion and charge transport channels on the surface through the electrochemically active doping layer. Consequently, the surface-doped lithium manganate demonstrates enhanced electrochemical performance. This study provides encouraging evidence that surface doping could be a promising alternative to improve the cycling performance of lithium-ion batteries.

Date: 2014
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DOI: 10.1038/ncomms6693

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