CoP nanoparticles enwrapped in N-doped carbon nanotubes for high performance lithium-ion battery anodes

doi:10.1007/s11706-018-0426-z

Front. Mater. Sci.

2018, Vol. 12

Issue (3) : 214-224 https://doi.org/10.1007/s11706-018-0426-z

RESEARCH ARTICLE

CoP nanoparticles enwrapped in N-doped carbon nanotubes for high performance lithium-ion battery anodes

Mengna CHEN^1,², Peiyuan ZENG^1,², Yueying ZHAO^1,², Zhen FANG^1,²(

)

¹. College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China
². Key Laboratory of Functional Molecular Solids (Ministry of Education), Anhui Normal University, Wuhu 241000, China

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Abstract

CoP is a candidate lithium storage material for its high theoretical capacity. However, large volume variations during the cycling processes haunted its application. In this work, a four-step strategy was developed to synthesize N-doped carbon nanotubes wrapping CoP nanoparticles (CoP@N-CNTs). Integration of nanosized particles and hollow-doped CNTs render the as-prepared CoP@N-CNTs excellent cycling stability with a reversible charge capacity of 648 mA·h·g⁻¹ at 0.2 C after 100 cycles. The present strategy has potential application in the synthesis of phosphide enwrapped in carbon nanotube composites which have potential application in lithium-ion storage and energy conversion.

Keywords composites nanostructures chemical synthesis electron microscopy energy storage

Corresponding Author(s): Zhen FANG

Online First Date: 17 July 2018 Issue Date: 10 September 2018

Cite this article:

Mengna CHEN,Peiyuan ZENG,Yueying ZHAO, et al. CoP nanoparticles enwrapped in N-doped carbon nanotubes for high performance lithium-ion battery anodes[J]. Front. Mater. Sci., 2018, 12(3): 214-224.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-018-0426-z
https://academic.hep.com.cn/foms/EN/Y2018/V12/I3/214

Fig.1 Schematic illustration for the formation process of CoP@N-CNTs (the Co precursor and PDA represent Co(CO₃)_0.35Cl_0.20(OH)_1.10 and polydopamine, respectively).

Fig.2 (a) Powder XRD patterns of the as-prepared CoP@N-CNTs along with the corresponding standard JCPDS card. (b) Raman spectrum of the as-prepared CoP@N-CNTs.

Fig.3 (a) SEM, (b) TEM, (c) HRTEM, (d) SAED, (e) magnified TEM images and (f)(g)(h)(i) corresponding EDS mappings of the as-prepared CoP@N-CNTs.

Fig.4 XPS spectra of CoP@N-CNTs: (a) Co 2p; (b) P 2p; (c) N 1s; (d) C 1s.

Fig.5 (a) Cyclic voltammograms of CoP@N-CNTs between 0.01 and 3.0 V at a scan rate of 0.1 mV·s⁻¹, (b) the first three charge–discharge voltage profiles of CoP@N-CNTs at a current density of 0.1 A·g⁻¹, (c) cycling performances and CEs of CoP@N-CNTs at a current density of 0.2 C, and (d) comparison of charge and discharge capacities of CoP@N-CNTs at various current rates.

Fig.6 (a) Nyquist plots obtained for the CoP@C nanotubes electrodes before and after cycles. (b) TEM images of the CoP@C electrodes after 100 charge/discharge cycles.

Fig. S1 TEM images of the formation process of CoP@N-CNTs: (a) Co(CO₃)_0.35Cl_0.20(OH)_1.10 nanorod; (b) Co(CO₃)_0.35Cl_0.20(OH)_1.10@PDA; (c) CoO@C; (d) CoP@C.

Fig. S2 SEM image of the sample obtained at 450°C.

Fig. S3(a) XRD pattern and (b) SEM image of Co(CO₃)_0.35Cl_0.20(OH)_1.10 nanorods.

Fig. S4(a) XRD pattern and (b) SEM image of CoO@N-CNTs.

Fig. S5 N₂ adsorption–desorption isotherm of CoP@N-CNTs (the inset shows the corresponding BJH pore size distribution curve).

Fig. S6 XPS survey spectrum for the CoP@N-CNTs.

Fig. S7 Cycling performances and Coulombic efficiencies of CoP@N-CNTs at the current density of (a) 0.5 C and (b) 1.0 C.

Fig. S8(a) Cycling performances and Coulombic efficiencies of pure CoP at the current density of 0.2 C. (b) Comparison of charge and discharge capacities of pure CoP at various current rates.

Table S1 Comparison the as-prepared CoP@N-CNTs with previously reported cobalt phosphide structures

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