Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Origin of additional capacities in metal oxide lithium-ion battery electrodes
AU - Hu, Yan-Yan
AU - Liu, Zigeng
AU - Nam, Kyung-Wan
AU - Borkiewicz, Olaf J.
AU - Cheng, Jun
AU - Hua, Xiao
AU - Dunstan, Matthew T.
AU - Yu, Xiqian
AU - Wiaderek, Kamila M.
AU - Du, Lin-Shu
AU - Chapman, Karena W.
AU - Chupas, Peter J.
AU - Yang, Xiao-Qing
AU - Grey, Clare P.
PY - 2013/12/31
Y1 - 2013/12/31
N2 - Metal fluorides/oxides (MFx/MxOy) are promising electrodes for lithium-ion batteries that operate through conversion reactions. These reactions are associated with much higher energy densities than intercalation reactions. The fluorides/oxides also exhibit additional reversible capacity beyond their theoretical capacity through mechanisms that are still poorly understood, in part owing to the difficulty in characterizing structure at the nanoscale, particularly at buried interfaces. This study employs high-resolution multinuclear/multidimensional solid-state NMR techniques, with in situ synchrotron-based techniques, to study the prototype conversion material RuO2. The experiments, together with theoretical calculations, show that a major contribution to the extra capacity in this system is due to the generation of LiOH and its subsequent reversible reaction with Li to form Li2O and LiH. The research demonstrates a protocol for studying the structure and spatial proximities of nanostructures formed in this system, including the amorphous solid electrolyte interphase that grows on battery electrodes.
AB - Metal fluorides/oxides (MFx/MxOy) are promising electrodes for lithium-ion batteries that operate through conversion reactions. These reactions are associated with much higher energy densities than intercalation reactions. The fluorides/oxides also exhibit additional reversible capacity beyond their theoretical capacity through mechanisms that are still poorly understood, in part owing to the difficulty in characterizing structure at the nanoscale, particularly at buried interfaces. This study employs high-resolution multinuclear/multidimensional solid-state NMR techniques, with in situ synchrotron-based techniques, to study the prototype conversion material RuO2. The experiments, together with theoretical calculations, show that a major contribution to the extra capacity in this system is due to the generation of LiOH and its subsequent reversible reaction with Li to form Li2O and LiH. The research demonstrates a protocol for studying the structure and spatial proximities of nanostructures formed in this system, including the amorphous solid electrolyte interphase that grows on battery electrodes.
U2 - 10.1038/NMAT3784
DO - 10.1038/NMAT3784
M3 - Journal article
VL - 12
SP - 1130
EP - 1136
JO - Nature Materials
JF - Nature Materials
SN - 1476-1122
ER -