TY - JOUR
T1 - Fluorine substitution enabled superior performance of NaxMn2-xO1.5F0.5 (x = 1.05–1.3) type Na-rich cathode
AU - Ganesan, Bala Krishnan
AU - Moorthy, Megala
AU - Thangavel, Ranjith
AU - Nam, Kyung Wan
AU - Aravindan, Vanchiappan
AU - Lee, Yun Sung
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/2/15
Y1 - 2023/2/15
N2 - Among the various sodium cathodes, the potential of Na-rich layered oxides is yet to be fully utilized. Unlike their Li counterparts, they are least explored and are at least a generation behind in development. Addressing the same, herein, Na-rich NaxMn2-xO1.5F0.5 (x = 1.05–1.3) type cathodes were synthesized successfully and analyzed as potential electrodes for Na-ion battery applications. Oxygen loss in Na-based transition metal oxides is a common issue, and it is effectively addressed by fluorine substitution. In contrast to exploring a particular stoichiometry as in other Na-deficient layered cathodes, herein, Na-content was gradually increased from 1.05 to 1.3. The cathodes were synthesized using a conventional solid-state approach and quenched to achieve high crystallinity. Compounds with different sodium stoichiometry were electrochemically tested in a half-cell configuration. Among these compounds, the Na1.2Mn0.8O1.5F0.5 electrode exhibited very high capacities of 178 and 122 mAhg−1 at current densities of 10 and 1000 mA g−1, respectively. The Na-rich Na1.2Mn0.8O1.5F0.5 cathode was systematically analyzed to understand the mechanism underlying its superior performance using various structural and electrochemical analyses. Furthermore, to demonstrate its practicality, the Na-rich Na1.2Mn0.8O1.5F0.5 cathode was coupled with a hard carbon and Na-In alloy anode in a full-cell assembly.
AB - Among the various sodium cathodes, the potential of Na-rich layered oxides is yet to be fully utilized. Unlike their Li counterparts, they are least explored and are at least a generation behind in development. Addressing the same, herein, Na-rich NaxMn2-xO1.5F0.5 (x = 1.05–1.3) type cathodes were synthesized successfully and analyzed as potential electrodes for Na-ion battery applications. Oxygen loss in Na-based transition metal oxides is a common issue, and it is effectively addressed by fluorine substitution. In contrast to exploring a particular stoichiometry as in other Na-deficient layered cathodes, herein, Na-content was gradually increased from 1.05 to 1.3. The cathodes were synthesized using a conventional solid-state approach and quenched to achieve high crystallinity. Compounds with different sodium stoichiometry were electrochemically tested in a half-cell configuration. Among these compounds, the Na1.2Mn0.8O1.5F0.5 electrode exhibited very high capacities of 178 and 122 mAhg−1 at current densities of 10 and 1000 mA g−1, respectively. The Na-rich Na1.2Mn0.8O1.5F0.5 cathode was systematically analyzed to understand the mechanism underlying its superior performance using various structural and electrochemical analyses. Furthermore, to demonstrate its practicality, the Na-rich Na1.2Mn0.8O1.5F0.5 cathode was coupled with a hard carbon and Na-In alloy anode in a full-cell assembly.
KW - Fluorine substitution
KW - Oxygen loss
KW - Sodium ion battery
KW - Sodium-rich cathode
UR - http://www.scopus.com/inward/record.url?scp=85141261256&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2022.139876
DO - 10.1016/j.cej.2022.139876
M3 - Article
AN - SCOPUS:85141261256
SN - 1385-8947
VL - 454
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 139876
ER -