Mn(II) deposition on anodes and its effects on capacity fade in spinel lithium manganate–carbon systems

Chun Zhan, Jun Lu, A. Jeremy Kropf, Tianpin Wu, Andrew N. Jansen, Yang-Kook Sun, Xinping Qiu () and Khalil Amine ()
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Chun Zhan: Key Laboratory of Organic Optoelectronics and Molecular Engineering, Tsinghua University
Jun Lu: Argonne National Laboratory
A. Jeremy Kropf: Argonne National Laboratory
Tianpin Wu: Argonne National Laboratory
Andrew N. Jansen: 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, 2013, vol. 4, issue 1, 1-8

Abstract: Abstract Dissolution and migration of manganese from cathode lead to severe capacity fading of lithium manganate–carbon cells. Overcoming this major problem requires a better understanding of the mechanisms of manganese dissolution, migration and deposition. Here we apply a variety of advanced analytical methods to study lithium manganate cathodes that are cycled with different anodes. We show that the oxidation state of manganese deposited on the anodes is +2, which differs from the results reported earlier. Our results also indicate that a metathesis reaction between Mn(II) and some species on the solid–electrolyte interphase takes place during the deposition of Mn(II) on the anodes, rather than a reduction reaction that leads to the formation of metallic Mn, as speculated in earlier studies. The concentration of Mn deposited on the anode gradually increases with cycles; this trend is well correlated with the anodes rising impedance and capacity fading of the cell.

Date: 2013
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DOI: 10.1038/ncomms3437

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