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An Exploratory Investigation of Spinel LiMn 1.5 Ni 0.5 O 4 as Cathode Material for Potassium‐Ion Battery
Author(s) -
Bhatia Ankush,
PereiraRamos JeanPierre,
Emery Nicolas,
Laïk Barbara,
Smith Ronald I.,
BaddourHadjean Rita
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000462
Subject(s) - spinel , electrochemistry , materials science , cathode , battery (electricity) , ion , redox , electroforming , potassium , chemical engineering , phase (matter) , electrode , metallurgy , nanotechnology , chemistry , power (physics) , physics , organic chemistry , quantum mechanics , layer (electronics) , engineering
The emerging interest in K‐ion batteries (KIBs) increases the importance of cathodes with high working voltage in this system. The LiMn 1.5 Ni 0.5 O 4 spinel is a promising alternative for the next generation of high voltage Li‐ion positive electrodes and its delithiated structure could be of interest for KIBs. In this work, Li ions are extracted from LiMn 1.5 Ni 0.5 O 4 by a first electrochemical oxidation. The electroformed λ‐Mn 0.75 Ni 0.25 O 2 spinel phase is shown to convert into layered K 0.5 Mn 0.75 Ni 0.25 O 2 (KMNO) at 20 °C along the first discharge in K cell. Then, 0.3 K + /KMNO (90 mAh g −1 ) are reversibly exchanged during the subsequent cycle. Superior electrochemical performance are reported for KMNO as compared to K 0.5 MnO 2 (KMO): a higher working voltage vs. K + /K (3.10 V vs. 2.79 V), enhanced rate capability and better cycling stability (70 mAh g −1 after 60 cycles at C/20 for KMNO vs. 40 mAh g −1 for KMO). The contribution of the Ni redox system is revealed as a reason for these improved performances.