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Hierarchical Hollow‐Nanocube Ni−Co Skeleton@MoO 3 /MoS 2 Hybrids for Improved‐Performance Lithium‐Ion Batteries
Author(s) -
Li Juan,
Hou Shuang,
Liu Tiezhong,
Wang Liangke,
Mei Chen,
Guo Yayun,
Zhao Lingzhi
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904085
Subject(s) - materials science , anode , lithium (medication) , raman spectroscopy , chemical engineering , prussian blue , precipitation , particle size , hydrothermal circulation , metal , nickel , phase (matter) , alloy , electrochemistry , nanotechnology , metallurgy , electrode , chemistry , engineering , organic chemistry , meteorology , medicine , physics , optics , endocrinology
Improving the performance of anode materials for lithium‐ion batteries (LIBs) is a hotly debated topic. Herein, hollow Ni−Co skeleton@MoS 2 /MoO 3 nanocubes (NCM‐NCs), with an average size of about 193 nm, have been synthesized through a facile hydrothermal reaction. Specifically, MoO 3 /MoS 2 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 MoO 3 /MoS 2 composites. According to Raman spectroscopy results, as‐obtained defect‐rich MoS 2 is confirmed to be a metallic 1T‐phase MoS 2 . 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.