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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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Published in: | ACS applied materials & interfaces 2022-07, Vol.14 (29), p.33438-33446 |
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Main Authors: | , , , , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 1944-8244 1944-8252 |
DOI: | 10.1021/acsami.2c10798 |