Hierarchical Hollow‐Nanocube Ni−Co Skeleton@MoO 3 /MoS 2 Hybrids for Improved‐Performance Lithium‐Ion Batteries

Autor: Juan Li, Yayun Guo, Lingzhi Zhao, Shuang Hou, Liangke Wang, Tiezhong Liu, Chen Mei
Rok vydání: 2020
Předmět:
Zdroj: Chemistry – A European Journal. 26:2013-2024
ISSN: 1521-3765
0947-6539
DOI: 10.1002/chem.201904085
Popis: Improving the performance of anode materials for lithium-ion batteries (LIBs) is a hotly debated topic. Herein, hollow Ni-Co skeleton@MoS2 /MoO3 nanocubes (NCM-NCs), with an average size of about 193 nm, have been synthesized through a facile hydrothermal reaction. Specifically, MoO3 /MoS2 composites are grown on Ni-Co skeletons derived from nickel-cobalt Prussian blue analogue nanocubes (Ni-Co PBAs). The Ni-Co PBAs were synthesized through a precipitation method and utilized as self-templates that provided a larger specific surface area for the adhesion of MoO3 /MoS2 composites. According to Raman spectroscopy results, as-obtained defect-rich MoS2 is confirmed to be a metallic 1T-phase MoS2 . Furthermore, the average particle size of Ni-Co PBAs (≈43 nm) is only about one-tenth of the previously reported particle size (≈400 nm). If assessed as anodes of LIBs, the hollow NCM-NC hybrids deliver an excellent rate performance and superior cycling performance (with an initial discharge capacity of 1526.3 mAh g-1 and up to 1720.6 mAh g-1 after 317 cycles under a current density of 0.2 A g-1 ). Meanwhile, ultralong cycling life is retained, even at high current densities (776.6 mAh g-1 at 2 A g-1 after 700 cycles and 584.8 mAh g-1 at 5 A g-1 after 800 cycles). Moreover, at a rate of 1 A g-1 , the average specific capacity is maintained at 661 mAh g-1 . Thus, the hierarchical hollow NCM-NC hybrids with excellent electrochemical performance are a promising anode material for LIBs.
Databáze: OpenAIRE
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