TY - JOUR
T1 - Operando structural characterization of the lithium-substituted layered sodium-ion cathode material P2-Na0.85Li0.17Ni 0.21Mn0.64O2 by X-ray absorption spectroscopy
AU - Karan, Naba K.
AU - Slater, Michael D.
AU - Dogan, Fulya
AU - Kim, Donghan
AU - Johnson, Christopher S.
AU - Balasubramanian, Mahalingam
PY - 2014
Y1 - 2014
N2 - Layered sodium-ion cathode material P2-Na0.85Li 0.17Ni0.21Mn0.64O2 was investigated using operandoXASto characterize structural changes occurring in the material during electrochemical sodiation/desodiation. Based on XANES data, the primary mode of charge compensation in this material is due to Ni2-3/4+ redox activity, while the Mn remains in the +4 oxidation state, thereby providing stability to this material during extended cycling. Investigation of the initial state of the compound by high resolution synchrotron XRD and 6Li MAS NMR revealed a significant amount of structural disorder due to integration of a small amount of monoclinic layered Li phase within the overall hexagonal layered Na-structure, which manifests as Li-induced stacking faults. High quality EXAFS data could be obtained using our cell construction and revealed the local structural evolution around the redox active Ni centers.
AB - Layered sodium-ion cathode material P2-Na0.85Li 0.17Ni0.21Mn0.64O2 was investigated using operandoXASto characterize structural changes occurring in the material during electrochemical sodiation/desodiation. Based on XANES data, the primary mode of charge compensation in this material is due to Ni2-3/4+ redox activity, while the Mn remains in the +4 oxidation state, thereby providing stability to this material during extended cycling. Investigation of the initial state of the compound by high resolution synchrotron XRD and 6Li MAS NMR revealed a significant amount of structural disorder due to integration of a small amount of monoclinic layered Li phase within the overall hexagonal layered Na-structure, which manifests as Li-induced stacking faults. High quality EXAFS data could be obtained using our cell construction and revealed the local structural evolution around the redox active Ni centers.
UR - http://www.scopus.com/inward/record.url?scp=84904815497&partnerID=8YFLogxK
U2 - 10.1149/2.088406jes
DO - 10.1149/2.088406jes
M3 - Article
AN - SCOPUS:84904815497
SN - 0013-4651
VL - 161
SP - A1107-A1115
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 6
ER -