SnS nanosheets firmly bound in alkali-treated wrinkled MXene framework with enhanced lithium-ion storage

An alkali-treated MXene-SnS hybrid was prepared through hydrothermal methods. The Alk-MXene microplates provide highway for electronic transport, and the 3D wrinkled morphology ensures sufficient channels for Li' diffusion. The alkali treatment of MXene gives Alk-MXene@SnS enhanced binding strength, which allows the SnS nanosheets to remain firm binding with the Alk-MXene substrate during cycling and overcome capacity decay caused by large volume change. The synergy between the two com-ponents guarantees the hybrid excellent electrochemical properties by enabling high electronic/ionic conductivity and superior kinetic properties as evidenced by EIS, GITT tests and DFT calculation. As a result, the Alk-MXene@SnS retains specific capacities of 519 mAh/g after 100 cycles at 200 mA g-1, and 330 mAh/g at the high rate of 8000 mA g-1. In addition, a reversible capacity of 421 mAh/g can be provided after long term cycle test at 1000 mA g-1 for 800 cycles.(c) 2022 Elsevier Inc. All rights reserved.

Automated summary

An alkali-treated MXene-SnS hybrid was prepared through hydrothermal methods. The alkali treatment improved the binding strength of MXene and enabled the SnS nanosheets to remain firmly bound to the MXene substrate. The synergy between the two components resulted in excellent electrochemical properties, including high electronic/ionic conductivity and superior kinetic properties.