Fast sodium storage kinetics of lantern-like Ti0.25Sn0.75S2 connected via carbon nanotubes

摘要: Abstract Tin disulfide is a promising anode material for sodium-ion batteries because of its advantages abundant source materials and ultrahigh capacity. To solve the issues volume expansion low conductivity, moderate amount elemental titanium was introduced into crystal structure SnS 2 to partially replace tin, providing lantern-like Ti 0.25 Sn 0.75 S , which firmly linked with one-dimensional multi-walled carbon nanotubes (MWCNTs) produce active battery anodes. The electrochemically inert Ti-containing component provided stable host during insertion extraction processes sodium ions enlarged interlayer spacing . combination MWCNTs gave high-conductivity prevented dissolution polysulfide. In particular, architecture pores large surface area not only decreased transmission path but also reserved space expansion. Benefiting from these features, @MWCNTs composite exhibited an initial charging capacity 426 mA h g −1 remained at 400 after 1000 cycles. Furthermore, this showed outstanding rate performance, displaying 364 high current density 800