Fluorine substitution enabled superior performance of NaxMn2-xO1.5F0.5 (x=1.05-1.3) type Na-rich cathode

被引:10
作者
Ganesan, Bala Krishnan [1 ]
Moorthy, Megala [1 ]
Thangavel, Ranjith [2 ]
Nam, Kyung-Wan [3 ]
Aravindan, Vanchiappan [4 ]
Lee, Yun-Sung [1 ]
机构
[1] Chonnam Natl Univ, Sch Chem Engn, Gwangju 61186, South Korea
[2] Indian Inst Technol Guwahati, Sch Energy Sci & Engn, Gauhati 781039, India
[3] Dongguk Univ Seoul, Dept Energy & Mat Engn, Seoul 04620, South Korea
[4] Indian Inst Sci Educ & Res IISER, Dept Chem, Tirupati 517507, India
基金
新加坡国家研究基金会;
关键词
Fluorine substitution; Sodium-rich cathode; Oxygen loss; Sodium ion battery; SODIUM-ION BATTERIES; ELECTROCHEMICAL PERFORMANCE; PRUSSIAN WHITE; CAPACITY; TRANSITION; MECHANISM; OXIDES;
D O I
10.1016/j.cej.2022.139876
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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, 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.
引用
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页数:9
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