Affiliation:
1. College of Chemistry and Materials Science Sichuan Normal University Chengdu 610066 P. R. China
2. State Key Laboratory of Environment‐Friendly Energy Materials School of Materials and Chemistry Southwest University of Science and Technology Mianyang Sichuan 621010 P. R. China
3. School of Chemistry and Chemical Engineering Northwestern Polytechnical University Xi'an Shanxi 710129 P. R. China
Abstract
AbstractNickel sulfides with high theoretical capacity are considered as promising anode materials for sodium‐ion batteries (SIBs); however, their intrinsic poor electric conductivity, large volume change during charging/discharging, and easy sulfur dissolution result in inferior electrochemical performance for sodium storage. Herein, a hierarchical hollow microsphere is assembled from heterostructured NiS/NiS2 nanoparticles confined by in situ carbon layer (H‐NiS/NiS2@C) via regulating the sulfidation temperature of the precursor Ni‐MOFs. The morphology of ultrathin hollow spherical shells and confinement of in situ carbon layer to active materials provide rich channels for ion/electron transfer and alleviate the effects of volume change and agglomeration of the material. Consequently, the as‐prepared H‐NiS/NiS2@C exhibit superb electrochemical properties, satisfactory initial specific capacity of 953.0 mA h g−1 at 0.1 A g−1, excellent rate capability of 509.9 mA h g−1 at 2 A g−1, and superior longtime cycling life with 433.4 mA h g−1 after 4500 cycles at 10 A g−1. Density functional theory calculation shows that heterogenous interfaces with electron redistribution lead to charge transfer from NiS to NiS2, and thus favor interfacial electron transport and reduce ion‐diffusion barrier. This work provides an innovative idea for the synthesis of homologous heterostructures for high‐efficiency SIB electrode materials.
Funder
Natural Science Foundation of Sichuan Province
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
17 articles.
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