期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 20, 期 10, 页码 1892-1898出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(09)60391-5
关键词
lithium-ion battery; cathode material; sodium manganese oxides; electrochemical properties; sol-gel technology
资金
- National Natural Science Foundation of China [20871101]
- Research Foundation of Education Bureau of Hunan Province, China [08A067]
Sodium manganese oxides, NaxMnO2+delta (x = 0.4, 0.5, 0.6, 0.7, 1.0; delta = 0-0.3), were synthesized by solid-state reaction routine combined with sol-gel process. The structure, morphology and electrochemical performances of as-prepared samples were characterized by XRD, SEM, CV, EIS and galvanostatic charge/discharge experiments. It is found that Na0.6MnO2+delta and Na0.7MnO2+delta have high discharge capacity and good cycle performance. At a current density of 25 mA/g at the cutoff voltage of 2.0-4.3 V, Na0.6MnO2+delta gives the second discharge capacity of 188 mA center dot h/g and remains 77.9% of second discharge capacity after 40 cycles. Na0.7MnO2+delta exhibits the second discharge capacity of 176 mA center dot h/g and shows better cyclic stability; the capacity retention after 40 cycles is close to 85.5%. Even when the current density increases to 250 mA/g, the discharge capacity of Na0.7MnO2+delta still approaches to 107 mA center dot h/g after 40 cycles.
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