Niu Feier, Mao Yueyuan, Wang Nana, Feng Zhenying, Chen Junming, Ye Longqiang, Zhang Shaoqing, Bai Zhongchao, Dou Shixue
College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu 233000, PR China; Anhui Province Quartz Sand Purification and Photovoltaic Glass Engineering Research Center, Bengbu 233000, PR China.
College of Chemistry and Materials Engineering, Anhui Science and Technology University, Bengbu 233000, PR China.
J Colloid Interface Sci. 2024 Feb;655:760-770. doi: 10.1016/j.jcis.2023.11.073. Epub 2023 Nov 13.
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, TiC MXene is introduced into the MoS interlayer by the "pillar effect" to assemble a layer-by-layer inter-embedded structure (L-MoS/TiC), which provides sufficient diffusion channels for Zn-ions. DFT computations and GITT confirm that the L-MoS/TiC exhibits superior Zn-ions migration kinetics. Therefore, L-MoS/TiC shows excellent long-term cycling stability (75.6% capacity retention after 7000 cycles at 15 A g) and glorious high-rate capability (107 mAh g at 20 A g). In addition, the practical application of this material is demonstrated by evaluating the performance of L-MoS/TiC 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.
二维（2D）层状材料因其灵活且可调节的层间结构而在锌存储方面具有广阔前景。然而，强静电相互作用和高扩散能垒导致锌离子在二维界面间的扩散动力学缓慢，限制了其广泛应用。在此，通过“柱撑效应”将TiC MXene引入到MoS层间，组装成逐层相互嵌入结构（L-MoS/TiC），为锌离子提供了充足的扩散通道。密度泛函理论（DFT）计算和恒电流间歇滴定技术（GITT）证实L-MoS/TiC具有优异的锌离子迁移动力学。因此，L-MoS/TiC表现出出色的长期循环稳定性（在15 A g下7000次循环后容量保持率为75.6%）和卓越的高倍率性能（在20 A g下为107 mAh g）。此外，通过评估L-MoS/TiC在各种极端弯曲条件下的柔性准固态水系锌离子电池中的性能，证明了该材料的实际应用，其在180°弯曲下4000次循环过程中表现出良好的稳定性，在2.0 A g下容量保持率为80.5%。
