Regulating interfacial ion migration with pillar effect in layer-by-layer inter-embedded MoS2/Ti3C2 for high-performance zinc-ion batteries
Two-dimensional (2D) layered materials have promising prospects for Zn-storage due to their flexible and adjustable interlayer architecture. The strong electrostatic interaction and high diffusion energy barrier, however, lead to slow diffusion kinetics of Zn-ions between the 2D interfaces, limiting its widespread application. Herein, Ti 3 C 2 MXene is introduced into the MoS 2 interlayer by the “pillar effect” to assemble a layer-by-layer inter-embedded structure (L-MoS 2 /Ti 3 C 2 ), which provides sufficient diffusion channels for Zn-ions. DFT computations and GITT confirm that the L-MoS 2 /Ti 3 C 2 exhibits superior Zn-ions migration kinetics. Therefore, L-MoS 2 /Ti 3 C 2 shows excellent long-term cycling stability (75.6% capacity retention after 7000 cycles at 15 A g -1 ) and glorious high-rate capability (107 mAh g -1 at 20 A g -1 ). In addition, the practical application of this material is demonstrated by evaluating the performance of L-MoS 2 /Ti 3 C 2 in flexible quasi-solid-state aqueous zinc ion batteries under various extreme bending conditions, which exhibits good stability under 180° during the 4000 cycles with a capacity retention of 80.5% at 2.0 A g -1 .
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