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Nanoscaled LiMn 2 O 4 for Extended Cycling Stability in the 3 V Plateau

Extending the potential window toward the 3 V plateau below the typically used range could boost the effective capacity of LiMn O spinel cathodes. This usually leads to an "overdischarge" of the cathode, which can cause severe material damage due to manganese dissolution into the electroly...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2022-07, Vol.14 (29), p.33438-33446
Main Authors: Siller, Valerie, Gonzalez-Rosillo, Juan Carlos, Eroles, Marc Nuñez, Baiutti, Federico, Liedke, Maciej Oskar, Butterling, Maik, Attallah, Ahmed G, Hirschmann, Eric, Wagner, Andreas, Morata, Alex, Tarancón, Albert
Format: Article
Language:English
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Summary:Extending the potential window toward the 3 V plateau below the typically used range could boost the effective capacity of LiMn O spinel cathodes. This usually leads to an "overdischarge" of the cathode, which can cause severe material damage due to manganese dissolution into the electrolyte and a critical volume expansion (induced by Jahn-Teller distortions). As those factors determine the stability and cycling lifetime for all-solid-state batteries, the operational window of LiMn O is usually limited to 3.5-4.5 V versus Li/Li in common battery cells. However, it has been reported that nano-shaped particles and thin films can potentially mitigate these detrimental effects. We demonstrate here that porous LiMn O thin-film cathodes with a certain level of off-stoichiometry show improved cycling stability for the extended cycling range of 2.0-4.5 V versus Li/Li . We argue through spectroscopic ellipsometry that the origin of this stability lies in the surprisingly small volume change in the layer during lithiation.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.2c10798