共 48 条
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.
引用
收藏
页数:10
相关论文