Author(s): Lin, QF (Lin, Qifeng); Yuan, ZY (Yuan, Zeyu); Wang, DY (Wang, Dongyi); Wei, W (Wei, Wei); Wang, XB (Wang, Xibin); Han, W (Han, Wei); Wang, LL (Wang, Lili)

Source: ELECTROCHIMICA ACTA Volume: 432 Article Number: 141012 DOI: 10.1016/j.electacta.2022.141012 Published: NOV 10 2022

Abstract: The growing problem of limited lithium resource reserves has resulted in increased attention and a corre-sponding surge in sodium-ion battery (SIB) research. However, SIBs have disadvantages, such as a short cycle life and low energy density. The lack of high capacity and long-cycle stability anode materials are important factors hindering the development of SIBs. In this study, hollow carbon nanospheres were nitrogen-doped, and the zeolitic imidazolate framework-67 was used as a precursor to synthesize cobalt-based layered double hydroxide using the hydrothermal method followed by synthesizing an NHCNS@CoSe2@C complex using calcination and carbon coating. In this design concept, the hollow-cavity structure of the carbon nanospheres provided shorter electron diffusion paths and increased stability; the introduction of nitrogen increased the number of defect sites and charge density of the porous carbon materials, which, with the transition metal selenide, enhanced the conductivity of the final product. The resulting carbon-supported anode material, NHCNS@CoSe2@C, had an initial stable discharge capacity of 465.6 mAh g -1 at a current density of 0.1 A g -1 and maintained a high capacity of 373.8 mAh g -1 after 100 cycles. Moreover, it exhibited a high rate performance of 285.6 mAh g -1 at a current density of 5 A g -1.

Accession Number: WOS:000868934200003

ISSN: 0013-4686

eISSN: 1873-3859

Full Text: https://www.sciencedirect.com/science/article/pii/S0013468622011690?via%3Dihub