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Rational Design of Perforated Bimetallic (Ni, Mo) Sulfides/N‐doped Graphitic Carbon Composite Microspheres as Anode Materials for Superior Na‐Ion Batteries
Author(s) -
Lee Jae Seob,
Saroha Rakesh,
Oh Se Hwan,
Shin Dong Hyeok,
Jeong Sang Mun,
Kim JaeKwang,
Cho Jung Sang
Publication year - 2021
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.202100195
Subject(s) - materials science , anode , mesoporous material , composite number , chemical engineering , electrochemistry , non blocking i/o , carbon fibers , bimetallic strip , polystyrene , nanotechnology , electrode , composite material , polymer , catalysis , metallurgy , organic chemistry , chemistry , metal , engineering
Highly conductive 3D ordered mesoporous Ni 7 S 6 ‐MoS 2 /N‐doped graphitic carbon (NGC) composite (P‐NiMoS/C) microspheres are prepared as anode materials for Na‐ion batteries. The rationally designed nanostructure comprises stable Ni 7 S 6 ‐ and MoS 2 ‐phases along with the homogeneously distributed ordered mesopores (ϕ = 50 nm) over the external and internal structures generated through thermal decomposition of polystyrene nanobeads (ϕ = 100 nm). Therefore, the P‐NiMoS/C microspheres deliver initial discharge capacities of 662, 419, 373, 300, 231, 181, and 146 mA h g −1 at current densities of 0.5, 1, 2, 4, 6, 8, and 10 A g −1 , respectively. Furthermore, P‐NiMoS/C exhibits a stable discharge capacity of 444 mA h g −1 at the end of the 150th cycle at a current density of 0.5 A g −1 , indicating higher cycling stability than the filled, that is, non‐mesoporous, Ni 3 S 2 ‐MoS 2 /NGC (F‐NiMoS/C) microspheres and filled carbon‐free Ni 3 S 2 ‐MoS 2 (F‐NiMoS) microspheres. The superior electrochemical performance of P‐NiMoS/C microspheres is attributed to the rapid Na + ion diffusion, alleviation of severe volume stress during prolonged cycling, and higher electrical conductivity of NGC, which results in fast charge transfer during the redox processes. The results in the present study can provide fundamental knowledge for the development of multicomponent, porous, and highly conductive anodes for various applications.