Highly stable few-layer V2CTx MXene/Carbon nanotube structure with restrained restacking for lithium ion storage.

[Display omitted] V 2 CT x MXene has shown potential as an electrode material for lithium-ion batteries (LIBs) due to its high theoretical capacity. However, most reports on V 2 CT x are confined to multilayer structures in LIBs, and V 2 CT x nanosheets have a serious restacking problem, which results in their low cyclic stability. Herein, we report the synthesis of few-layer V 2 CT x /carbon nanotubes (CNTs) composite by tetramethylammonium hydroxide (TMAOH) delamination and electrostatic flocculation of NH 4 + ions. Few-layer V 2 CT x nanosheets with crimped structure can effectively restrain restacking and guarantee full utilization of active surface area. Moreover, with the introduction of CNTs, a developed electrical conductivity network was formed, and CNTs provided structural support for the sheets further restraining their restacking, and ensuring their stable structure during the charge and discharge process even at high rates. This made the few-layer V 2 CT x /CNT to exhibit a high specific capacitance of 621 mAh/g after 100 cycles at 0.1 A/g, and outstanding rate performance of 290 mAh/g at 5 A/g. Furthermore, the few-layer V 2 CT x /CNT electrode showed excellent cycling stability with 82.1 % capacitance retention after 2000 cycles at 5 A/g. This shows it has significant potential for lithium-ion batteries applications. [ABSTRACT FROM AUTHOR]