Tailoring Storage Capacity and Ion Kinetics in Ti2CO2/ Graphene Heterostructures by Functionalization of Graphene

Two-dimensional (2D) materials) offer great potential for battery applications, due to their large surface areas, ability to accommodate various ions and molecules between their layers, and open channels for ion transport. The authors demonstrate that heterostructures made of an $M\phantom{\rule{0}{0ex}}X$ene and functionalized graphene are promising candidates to control and manipulate the generation and diffusion of Li${}^{+}$ at the interface of the dissimilar materials. Combining doped graphene with an $M\phantom{\rule{0}{0ex}}X$ene enhances storage capacity and markedly limits the volume change that is critical for eliminating restacking and maintaining cyclic stability.