Electrochemical properties of ACNF/Li2FeSiO4 composite nanostructures for supercapacitors

被引:5
作者
Nilmoung, Sukanya [1 ]
Limphirat, Wanwisa [2 ]
Maensiri, Santi [3 ,4 ]
机构
[1] Rajamangala Univ Technol Isan, Fac Sci & Liberal Arts, Dept Appl Phys, Nakhon Ratchasima 30000, Thailand
[2] Synchrotron Light Res Inst Publ Org, Nakhon Ratchasima 30000, Thailand
[3] Suranaree Univ Technol, Sch Phys, Inst Sci, Nakhon Ratchasima 30000, Thailand
[4] Suranaree Univ Technol, SUT Ctr Excellence Adv Funct Nanomat, Nakhon Ratchasima 30000, Thailand
关键词
Activated carbon nanofibers; Li2FeSiO4; Supercapacitors; Electrospinning; In-situ x-ray absorption spectroscopy; LITHIUM-ION BATTERY; CATHODE MATERIAL; LI2FESIO4/C COMPOSITE; MESOPOROUS LI2FESIO4/C; PERFORMANCE; CARBON; CAPACITY; NANOFIBERS; HOLLOW;
D O I
10.1016/j.jallcom.2022.164466
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
This work reports the synthesis and electrochemical properties of activated carbon nanofibers (ACNF) composited with Li2FeSiO4 for supercapacitors. The prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller analyzer (BET), transmission electron microscopy (TEM), and thermal gravimetric analyzer (TGA). The electrochemical properties were tested using a variety of techniques, such as cyclic voltammetry (CV), galvanostatic charge-discharge (GDC), and electrochemical impedance spectroscopy (EIS). The structural transformation during charging and discharging processes was studied by in-situ time resolved X-ray absorption spectroscopy (in-situ TRXAS). The ACNF/Li2FeSiO4 presented monoclinic structure with space group of P21/n, although there was a small impurity of FeO. The structural transformations of iron upon cycling in the + 2 to + 3 state were responsible for high capacity of ACNF/Li2FeSiO4 materials. The maximum specific capacitance of 158 Fg-1 at 2 mVs-1 and 201 Fg-1 at 0.25 Ag-1 with the corresponding specific energy of 17.8 Whkg-1 and specific power of 99.7 Wkg-1 were observed. Moreover, this composite material exhibited an excellent cycle performance through maintaining over 85% of its initial capacitance after 1000 cycles. The interesting electrochemical properties of ACNF/Li2FeSiO4 composite nanostructure make it a potential candidate for supercapacitors. (c) 2022 Elsevier B.V. All rights reserved.
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页数:10
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