Two-dimensional transition metal carbide materials (termed MXenes) have attracted great research interest for electrochemical energy storage applications. Herein, with inspiration from the unique structure of pillared interlayered clays, our group demonstrated the fabrication of a series of pillar-structured MXene (Sn4+/S atoms pillared MXene) via a facile liquid-phase alkali metal ion/cationic surfactant pre-pillaring and Sn4+/S atoms pillaring methods. The interlayer spacing of Ti3C2MXene can be precisely controlled to be between 1 and 2.71 nm according to the size of the intercalated pre-pillaring agent (alkali metal ion, cationic surfactants). Because of the pillar effect, the obtained Sn4+ pillared MXene delivers a remarkable stable capacity of 765 mAh g-1 at 0.1 A g-1 for lithium-ion storage, and the obtained S atoms pillared MXene delivers an improved Na-ion capacity of 550 mAh g-1at 0.1 A g-1 (≈120 mAh g-1 at 15 A g-1, the best MXene-based Na+-storage rate performance reported so far), and excellent cycling stability over 5000 cycles at 10 A g-1. We believe this pillared structure design of MXene will provide insight in synthesizing MXene-based nanostructures for high-performance energy storage devices.

Pillared structure design of MXene with controlled interlayer spacing for high performance lithium/sodium-ion storage

2019 Fall National Meeting

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