TY - JOUR
T1 - On Disrupting the Na+-Ion/Vacancy Ordering in P2-Type Sodium-Manganese-Nickel Oxide Cathodes for Na+-Ion Batteries
AU - Gutierrez, Arturo
AU - Dose, Wesley M.
AU - Borkiewicz, Olaf
AU - Guo, Fangmin
AU - Avdeev, Maxim
AU - Kim, Soojeong
AU - Fister, Timothy T.
AU - Ren, Yang
AU - Bareño, Javier
AU - Johnson, Christopher S.
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2018/10/18
Y1 - 2018/10/18
N2 - An investigation of the electrochemical and structural properties of layered P2-Na0.62Mn0.75Ni0.25O2 is presented. The effect of changing the Mn/Ni ratio (3:1) from what is found in Na0.67Mn0.67Ni0.33O2 (2:1) and consequently the introduction of a third metal center (Mn3+) was investigated. X-ray powder diffraction (in situ and ex situ) revealed the lack of Na+-ion/vacancy ordering at the relevant sodium contents (x = 0.33, 0.5, and 0.67). Mn3+ in Na0.62Mn0.75Ni0.25O2 introduces defects into the Ni-Mn interplane charge order that in turn disrupts the ordering within the Na-plane. The material underwent P2-O2 and P2-P2′ phase transitions at high (4.2 V) and low (∼1.85 V) voltages, respectively. The material was tested at several different voltage ranges to understand the effect of the phase transitions on the capacity retention. Interestingly, the inclusion of both phase transitions demonstrated comparable cycling performance to when both phase transitions were excluded. Last, excellent rate performance was demonstrated between 4.3 and 1.5 V with a specific capacity of 120 mA h/g delivered at 500 mA/g current density.
AB - An investigation of the electrochemical and structural properties of layered P2-Na0.62Mn0.75Ni0.25O2 is presented. The effect of changing the Mn/Ni ratio (3:1) from what is found in Na0.67Mn0.67Ni0.33O2 (2:1) and consequently the introduction of a third metal center (Mn3+) was investigated. X-ray powder diffraction (in situ and ex situ) revealed the lack of Na+-ion/vacancy ordering at the relevant sodium contents (x = 0.33, 0.5, and 0.67). Mn3+ in Na0.62Mn0.75Ni0.25O2 introduces defects into the Ni-Mn interplane charge order that in turn disrupts the ordering within the Na-plane. The material underwent P2-O2 and P2-P2′ phase transitions at high (4.2 V) and low (∼1.85 V) voltages, respectively. The material was tested at several different voltage ranges to understand the effect of the phase transitions on the capacity retention. Interestingly, the inclusion of both phase transitions demonstrated comparable cycling performance to when both phase transitions were excluded. Last, excellent rate performance was demonstrated between 4.3 and 1.5 V with a specific capacity of 120 mA h/g delivered at 500 mA/g current density.
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U2 - 10.1021/acs.jpcc.8b05537
DO - 10.1021/acs.jpcc.8b05537
M3 - RGC 21 - Publication in refereed journal
SN - 1932-7447
VL - 122
SP - 23251
EP - 23260
JO - The Journal of Physical Chemistry C
JF - The Journal of Physical Chemistry C
IS - 41
ER -