In-situ Synthesis of Coral-Like Molybdenum Phosphide (MoP) Microspheres for Lithium-Ion Battery

doi:10.1007/s40195-020-01160-7

金属学报英文版 ›› 2021, Vol. 34 ›› Issue (3): 401-409.DOI: 10.1007/s40195-020-01160-7

收稿日期:2020-07-20 修回日期:2020-09-19 接受日期:2020-10-04 出版日期:2021-03-10 发布日期:2021-03-10

In-situ Synthesis of Coral-Like Molybdenum Phosphide (MoP) Microspheres for Lithium-Ion Battery

Xinlong Liu¹, Wei Yang¹, Zhiting Liu¹, Haosen Fan¹(), Wenzhi Zheng¹()

¹School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou, 510006, China

Received:2020-07-20 Revised:2020-09-19 Accepted:2020-10-04 Online:2021-03-10 Published:2021-03-10
Contact: Haosen Fan,Wenzhi Zheng
About author:Wenzhi Zheng, wenzhizheng@gzhu.edu.cn
Haosen Fan, hsfan@gzhu.edu.cn;

摘要/Abstract

Abstract:

Molybdenum phosphide (MoP) has attracted extensive attention as promising anode candidates for lithium-ion batteries owing to its high specific capacity, low potential range and low polarization. However, severe volume changes and intrinsic low conductivity are major challenges for further application of MoP electrode materials. In this work, a coral-like MoP microsphere encapsulated by N-doped carbon (MoP@NDC) was successfully prepared through annealing the precursor derived from self-polymerization of dopamine with phosphomolybdic acid. The introduction of carbon framework not only serves as matrix to confine MoP nanocrystals from aggregations, but also improves the electrochemical conductivity and facilitates lithium ion or electron transport on the surface of MoP. Such hierarchical structure delivered high discharge capacity of 495 mAh g^-1 after 300 cycles with 90.1% capacity retention, which could be attributed to the synergistic effects of MoP nanoparticles and conductive carbon network. This design strategy shows MoP@NDC electrode with applicable application as anode in lithium-ion battery.

Key words: Pseudocapacitance, Coral-like, Lithium-ion batteries (LIBs), MoP@NDC, Anode

. [J]. 金属学报英文版, 2021, 34(3): 401-409.

Xinlong Liu, Wei Yang, Zhiting Liu, Haosen Fan, Wenzhi Zheng. In-situ Synthesis of Coral-Like Molybdenum Phosphide (MoP) Microspheres for Lithium-Ion Battery[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(3): 401-409.

图/表 6

Fig. 1 Schematic illustration of the preparation of MoP@NDC

Fig. 2 a XRD pattern of as-prepared MoP@NDC; b hexagonal structure of MoP

Fig. 3 a Raman spectrum of MoP@NDC; surface composition analysis of MoP/NDC: b XPS full spectrum; high-resolution spectra of c Mo 3d, d P 2p, e C 1 s and f N 1 s

Fig. 4 a-c SEM images of Mo-hybrids; d-f SEM images of MoP@NDC

Fig. 5 a CV curves at a scan rate of 0.1 mV s-1 within a potential range of 0.01-3 V; b galvanostatic charge/discharge profiles; c rate capability; d charge/discharge curves at various current densities; e cycling performance at 1.0 A g-1

Fig. 6 a CV curves at different sweep rates; b b values at different redox states; c contribution of capacitive current (pink region) at the sweep rate of 1.0 mV s-1; d bar chart pseudocapacitive contribution at different scan rates

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In-situ Synthesis of Coral-Like Molybdenum Phosphide (MoP) Microspheres for Lithium-Ion Battery

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