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On Disrupting the Na+-Ion/Vacancy Ordering in P2-Type Sodium–Manganese–Nickel Oxide Cathodes for Na+-Ion Batteries

Journal Article · · Journal of Physical Chemistry. C
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 diffraction (in-situ and powder) revealed the lack of Na+-ion/vacancy ordering at the relevant sodium contents (x = 0.33, 0.5 and 0.67). The Mn3+ in Na0.62Mn0.75Ni0.25O2 introduces defects into the Ni-Mn inter-plane charge order that in turn disrupts the ordering within the Na-plane. The material underwent a P2-O2 and P2-P2’ phase transition at high (4.2 V) and low (~ 1.85 V) voltages, respectively. The material was tested at several different voltage ranges in order 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. As a result, excellent rate performance was demonstrated between 4.3 – 1.5 V with a specific capacity of 120 mAh/g delivered at 500 mA/g current density.
Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1487115
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 41 Vol. 122; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Layered P2‐Type K 0.44 Ni 0.22 Mn 0.78 O 2 as a High‐Performance Cathode for Potassium‐Ion Batteries journal October 2019
Ni-based cathode materials for Na-ion batteries journal June 2019
High performance P2 sodium layered oxides: an in-depth study into the effect of rationally selected stoichiometry journal January 2019

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