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

Arturo Gutierrez, Wesley M. Dose, Olaf Borkiewicz, Fangmin Guo, Maxim Avdeev, Soojeong Kim, Timothy T. Fister, Yang Ren, Javier Bareño, Christopher S. Johnson*

*Corresponding author for this work

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

83 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)23251-23260
JournalThe Journal of Physical Chemistry C
Volume122
Issue number41
DOIs
Publication statusPublished - 18 Oct 2018
Externally publishedYes

Bibliographical note

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].

Fingerprint

Dive into the research topics of 'On Disrupting the Na+-Ion/Vacancy Ordering in P2-Type Sodium-Manganese-Nickel Oxide Cathodes for Na+-Ion Batteries'. Together they form a unique fingerprint.

Cite this