Understanding the Lithium Storage Mechanism of Ti3C2Tx MXene

By Renfei Cheng, T. Hu, Hui Zhang, Chun-mei Wang, Minmin Hu, Jinxing Yang, Cong Cui, Tianjia Guang, Changji Li, Chao Shi and 2 more. Journal of Physical Chemistry C, 2018

175 citations recorded by the source corpus.

MXenes, as an emerging family of conductive two-dimensional materials, hold promise for late-model electrode materials in Li-ion batteries. A primary challenge hindering the development of MXenes as electrode materials is that a complete understanding of the intrinsic storage mechanism underlying the charge/discharge behavior remains elusive. This article presents two key discoveries: first, the characteristics of the Ti3C2Tx structure can be modified systematically by calcination in various atmospheres, and second, these structural changes greatly affect Li-ion storage behavior, which reveals the mechanism for lithium storage in Ti3C2Tx MXene. Specifically, via ammonization, the interlayer spacing gets dilated and uniform, giving rise to only one redox couple. In stark contrast, there are two well-recognized redox couples corresponding to two interlayer spacings in pristine Ti3C2Tx MXene, in which Li-ion (de)intercalation occurs between interlayers in a sequential manner as evidenced by ex situ X-ray dif...

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/b9e3c4c60e779c97a6e0391065446cd9983dd152