Vertically Aligned Sn4+ Preintercalated Ti2CTX MXene Sphere with Enhanced Zn Ion Transportation and Superior Cycle Lifespan

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Detail(s)

Original languageEnglish
Journal / PublicationAdvanced Energy Materials
Publication statusOnline published - 5 Aug 2020

Abstract

While 2D MXenes have been widely used in energy storage systems, surface barriers induced by restacking of nanosheets and the limited kinetics resulting from insufficient interlayer spacing are two unresolved issues. Here an Sn4+ preintercalated Ti2CTX with effectively enlarged interlayer spacing is synthesized. The preintercalated Ti2CTX is aligned on a carbon sphere to further enhance ion transportation by shortening the ion diffusion path and enhancing the reaction kinetics. As a result, when paired with a Zn anode, 12 500 cycles, which equals 2 800 h cycle time, and 5% capacity fluctuation are obtained, surpassing all reported MXene-based aqueous electrodes. At 0.1 A g-1, the capacity reaches 138 mAh g-1, and 92 mAh g-1 remains even at 5 A g-1. In addition, the low anti-self-discharge rate of 0.989 mV h-1 associated with a high capacity retention of 80.5% over 548 h is obtained. Moreover, the fabricated quasi-solid capacitor based on a hydrogel film electrolyte exhibits good mechanical deformation and weather resistance. This work employs both preintercalation and alignment to MXene and achieves enhanced ion diffusion kinetics in an aqueous zinc ion capacitors (ZICs) system, which may be applied to other MXene batteries for enhanced performance.

Research Area(s)

  • aqueous capacitors, cycle lifespan, diffusion kinetics, Ti 2CT X MXene spheres, vertical alignment

Citation Format(s)

Vertically Aligned Sn4+ Preintercalated Ti2CTX MXene Sphere with Enhanced Zn Ion Transportation and Superior Cycle Lifespan. / Li, Xinliang; Li, Mian; Yang, Qi; Wang, Donghong; Ma, Longtao; Liang, Guojin; Huang, Zhaodong; Dong, Binbin; Huang, Qing; Zhi, Chunyi.

In: Advanced Energy Materials, 05.08.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal