Journal Article

IMPULSE-2020-00066

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Structural insights into the formation and voltage degradation of lithium- and manganese-rich layered oxides

Hua, W. (Corresponding author) ; Wang, S. ; Knapp, M. ; Leake, S. J. ; Senyshyn, A.MLZ* ; Richter, C. ; Yavuz, M. ; Binder, J. R. ; Grey, C. P. ; Ehrenberg, H. ; Indris, S. ; Schwarz, B.

2019
Nature Publishing Group UK [London]

Please use a persistent id in citations: doi:10.1038/s41467-019-13240-z

Abstract: One major challenge in the field of lithium-ion batteries is to understand the degradation mechanism of high-energy lithium- and manganese-rich layered cathode materials. Although they can deliver 30 % excess capacity compared with today’s commercially- used cathodes, the so-called voltage decay has been restricting their practical application. In order to unravel the nature of this phenomenon, we have investigated systematically the structural and compositional dependence of manganese-rich lithium insertion compounds on the lithium content provided during synthesis. Structural, electronic and electrochemical characterizations of LixNi0.2Mn0.6Oy with a wide range of lithium contents (0.00 ≤ x ≤ 1.52, 1.07 ≤ y < 2.4) and an analysis of the complexity in the synthesis pathways of monoclinic-layered Li[Li0.2Ni0.2Mn0.6]O2 oxide provide insight into the underlying processes that cause voltage fading in these cathode materials, i.e. transformation of the lithium-rich layered phase to a lithium-poor spinel phase via an intermediate lithium-containing rock-salt phase with release of lithium/oxygen.

Keyword(s): Energy (1st) ; Chemistry (2nd) ; Crystallography (2nd)

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Contributing Institute(s):

1. SPODI (SPODI)
2. STRUCTURE (STRUCTURE)

Experiment(s):

1. SPODI: High resolution powder diffractometer (SR8a)

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