A simple synthesis of VSe2/B4C@HCG composite as high-performance anodes for sodium-ion batteries

摘要

Sodium-ion batteries (SIBs) arouse researchers' interest gradually because of the scarcity of lithium sources. VSe2 is one of the transition metal dichalcogenides (TMDs) equipped with a huge interlayer distance to accommodate more Na+ ions, but the problems such as agglomeration, volume deformation, dissolution loss and so on hinder its further development. Therefore, a VSe2/B4C@HCG composite was fabricated by the simple high-energy ball milling method. The B4C and VSe2 nanoparticles are mixed and restrict each other, then anchor on the graphene, which alleviates agglomeration and volume deformation of VSe2 during cycling processes effectively, and improves the overall environmental stability and conductivity. As a result, the VSe2/B4C@HCG composite delivers a reversible capacity of 407.5 mAh g-1 with the coulombic efficiency of 98.5% after 450 cycles, superior rate performance of 524.2, 476.3, 413.7, 353.7, and 295.3 mAh g-1 at the different current density of 100, 200, 500, 1000, and 2000 mA g-1, and ultrastable long-term cycling property of 251.6 mAh g-1 at the current density of 1 A g-1 after 1000 cycles, indicating the VSe2/B4C@HCG composite shows utilization potentiality to be used as an excellent anode material for SIBs.

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