Premium
Tracking Ionic Rearrangements and Interpreting Dynamic Volumetric Changes in Two‐Dimensional Metal Carbide Supercapacitors: A Molecular Dynamics Simulation Study
Author(s) -
Xu Kui,
Lin Zifeng,
Merlet Céline,
Taberna PierreLouis,
Miao Ling,
Jiang Jianjun,
Simon Patrice
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201702068
Subject(s) - ionic liquid , electrolyte , molecular dynamics , chemical physics , mxenes , electrode , supercapacitor , ionic bonding , materials science , carbide , chemistry , ion , electrochemistry , nanotechnology , computational chemistry , organic chemistry , composite material , catalysis
Abstract We present a molecular dynamics simulation study achieved on two‐dimensional (2D) Ti 3 C 2 T x MXenes in the ionic liquid 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM] + [TFSI] − ) electrolyte. Our simulations reproduce the different patterns of volumetric change observed experimentally for both the negative and positive electrodes. The analysis of ionic fluxes and structure rearrangements in the 2D material provide an atomic scale insight into the charge and discharge processes in the layer pore and confirm the existence of two different charge‐storage mechanisms at the negative and positive electrodes. The ionic number variation and the structure rearrangement contribute to the dynamic volumetric changes of both electrodes: negative electrode expansion and positive electrode contraction.