期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 24, 期 2, 页码 415-422出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(14)63077-6
关键词
lithium ion battery; LiNi0.5Mn0.5O2; cyclic fading mechanism; cyclic voltammetry; LiNO3 solution
资金
- National Nature Science Foundation of China [21301193]
- China Postdoctoral Science Foundation [2013M530356]
- Scientific Research Foundation of Central South University [CUSZC201303]
- Open-End Found for Valuable and Precision Instruments of Central South University
Electrochemical behavior of layered LiNi0.5Mn0.5O2 in LiNO3 aqueous solution and its cyclic fading mechanism in electrolytes with different pH values were investigated. CV results show that LiNi0.5Mn0.5O2 has good electrochemical reversible behaviors in 5 mol/L LiNO3 solution. Meanwhile, the electrode in 5 mol/L LiNO3 with pH value of 12 demonstrates the best electrochemical stability. Based on the electrochemical impedance spectroscopy (EIS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) results, it is proposed that suppressed charge-transfer resistance is the major reason, which is probably ascribed to the more stable electrode surface and less structure change.
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