In situ uniformly vertical growth of SnSe2 nanosheet arrays on carbon cloth as a self-supporting anode toward effective sodium-ion storage

Abstract

Layered tin diselenide with high theoretical capacity and desirable redox voltage has emerged as a promising anode material for sodium-ion storage. However, achieving a highlight tin diselenide-based electrode that simultaneously exhibits prominent rate capability and ultralong cycling durability is the major challenge. Herein, highly efficient and durable SnSe2@CC nanosheet arrays were easily engineered based on the in situ growth of a SnO/SnO2 precursor on carbon cloth using a hydrothermal process followed by controlled selenation as an anode material for sodium-ion batteries. Benefiting from the uniformly vertical ultrathin nanosheet array morphology and the robust structural integrity of the self-supporting electrode, nanosheet aggregation and volume expansion were effectively alleviated, leading to fast reaction kinetics and satisfactory cycling ability. Thus, the resultant SnSe2@CC nanosheet arrays deliver an excellent reversible capacity of 604.7 mAh g−1 after 100 cycles at 0.1 A g−1, a rapid rate property with a specific capacity of 390.2 mAh g−1 at 5.0 A g−1 and ultral cycle lifespan with a reversible capacity of 350.4 mAh g−1 exceeding 1000 cycles. This research presents a novel method for the design and fabrication of advanced electrodes for sodium-ion storage.