Molten salt synthesis of CoFe2O4 and its energy storage properties

被引:12
作者
Kulkarni, Pranav [1 ,2 ,5 ]
Balkrishna, R. Geetha [1 ]
Ghosh, Debasis [1 ]
Rawat, R. S. [2 ]
Medwal, Rohit [2 ]
Chowdari, B. V. R. [4 ]
Karim, Zaghib [6 ]
Reddy, M., V [3 ,5 ,6 ]
机构
[1] Jain Univ, Ctr Nano & Mat Sci, Jain Global Campus, Bangalore 562112, Karnataka, India
[2] Nanyang Technol Univ Singapore, Natl Inst Educ, Nat Sci & Sci Educ, Singapore, Singapore
[3] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117575, Singapore
[4] Nanyang Technol Univ Singapore, Sch Mat Sci & Engn, Singapore, Singapore
[5] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore
[6] Hydroquebec, Ctr Excellence Transportat Electrificat & Energy, 1806 Lionel Boulet Blvd, Varennes, PQ J3X 1S1, Canada
关键词
CoFe2O4; Molten salt synthesis; Lithium batteries; Anode; Ex-situ XRD; Ex-situ TEM; Impedance spectroscopy; HIGH-PERFORMANCE ANODE; LITHIUM-ION BATTERY; HIGH-CAPACITY; COFE2O4/GRAPHENE NANOCOMPOSITE; FACILE SYNTHESIS; RATE CAPABILITY; LI-STORAGE; CO3O4; ELECTROCATALYST; MICROSPHERES;
D O I
10.1016/j.matchemphys.2020.123747
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In this article, we report simple and scalable one-pot molten salt synthesis of CoFe2O4 as electrode material for Lithium ion batteries. X-ray diffraction studies along with Rietveld analysis showed a pure phase of CoFe2O4 with space group Fd-3m and crystallite size of 54 nm. As an anode material CoFe2O4 showed high initial discharge/charge capacity of 1556/1093 mA h g(-1) and a reversible capacity of 926 mA h g(-1) after 30 cycles with columbic efficiency of 99%. A relatively high reversible capacity of 594 mA h g(-1) was observed at high current density of 1C (916 mA g(-1)) which shows the better reversibility of CoFe2O4 at high current density. As the current was reduced to 0.1C reversible capacity of 899 mA h g(-1) was retained suggesting high rate performance of CoFe2O4. The long-term stability test, carried out using galvanostatic charge/discharge (GC) at a current density of 0.5C, showed a reversible capacity of 369 mA h g(-1) at the end of 200th cycle. The structural and morphological evaluation of the sample after cycling, using ex-situ X-ray diffraction and ex-situ transmission electron microscopy, confirmed structural degradation and formation of metal nanoparticles, Li2O and amorphous nature of electrode material. The one-pot molten salt synthesis approach is quite simple and can be extended for large-scale production of electrode materials.
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页数:11
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