Freestanding MoO2/Mo2C imbedded carbon fibers for Li-ion batteries
Li, HQ (Li, Hongqin); Ye, HJ (Ye, Haijun); Xu, Z (Xu, Zheng); Wang, CY (Wang, Chuanyi); Yin, J (Yin, Jiao); Zhu, H (Zhu, Hui)
AbstractFlexible and freestanding MoO2/Mo2C imbedded carbon fibers (MoO2/Mo2C ICFs) have been successfully synthesized via an integrated procedure including electrospinning, thermo-plastication in air and reduction/carbonization at high temperature. A series of techniques such as SEM, TEM, N-2 adsorption-desorption analysis, XRD, TGA, IR and XPS have been employed to systemically characterize the MoO2/Mo2C ICFs. In particular, it is observed that the MoO2/Mo2C ICFs derived from phosphomolybdic acid have more highly porous structures than those derived from molybdic acid. Most impressively, the obtained MoO2/Mo2C ICFs are directly used as binder-and current collector-free anode materials for LIBs, which exhibit desirable rate capability and satisfactory cycling performance. The electrochemical investigations illustrated that the MoO2/Mo2C ICFs could deliver an initial discharging capacity of 1422.0 mA h g(-1) with an original coulombic efficiency of 63.3%, and the subsequent reversible capacity could reach as high as 1103.6 mA h g(-1) even after 70 cycles at a current density of 0.1 A g(-1). Such a capacity is larger than the theoretical capacity of MoO2 (838 mA h g(-1)) and pure carbon fibers (460.5 mA h g(-1)). More importantly, the MoO2/Mo2C ICFs exhibited an excellent rate performance with a capacity of 445.4 mA h g(-1) even at a charging current density of 1.6 A g(-1). The remarkable enhancement in rate capability and long cycling performance resulted from a synergistic effect between the MoO2 nanoparticles and porous carbon fiber matrix. This methodology can be widely extended to fabricate other metal oxide/carbon composites for significant energy storage and conversion applications.
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WOS IDWOS:000394940400030
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Affiliation1.Nanchang Univ, Coll Chem, 999 Xuefu Ave, Nanchang 330031, Jiangxi, Peoples R China
2.Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Key Lab Funct Mat & Devices Special Environm, 40-1 South Beijing Rd, Urumqi 830011, Xinjiang, Peoples R China
3.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Electroanalyt Chem, Changchun, Jilin, Peoples R China
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Li, HQ ,Ye, HJ ,Xu, Z ,et al. Freestanding MoO2/Mo2C imbedded carbon fibers for Li-ion batteries[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2017,19(4):2908-2914.
APA Li, HQ ,Ye, HJ ,Xu, Z ,Wang, CY ,Yin, J ,&Zhu, H .(2017).Freestanding MoO2/Mo2C imbedded carbon fibers for Li-ion batteries.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,19(4),2908-2914.
MLA Li, HQ ,et al."Freestanding MoO2/Mo2C imbedded carbon fibers for Li-ion batteries".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 19.4(2017):2908-2914.
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