Related Experiment Video
Updated: Feb 6, 2026

Atom Probe Tomography Analysis of Exsolved Mineral Phases
Published on: October 25, 2019
Atomic-Scale Probing of Reversible Li Migration in 1T-V1+ xSe2 and the Interactions between Interstitial V and Li
Ruiwen Shao1, Shulin Chen1,2, Zhipeng Dou1,3
1Electron Microscopy Laboratory, School of Physics , Peking University , Beijing 100871 , China.
Abstract:
Ionic doping and migration in solids underpins a wide range of applications including lithium ion batteries, fuel cells, resistive memories, and catalysis. Here, by in situ transmission electron microscopy technique we directly track the structural evolution during Li ions insertion and extraction in transition metal dichalcogenide 1T-V1+ xSe2 nanostructures which feature spontaneous localized superstructures due to the periodical interstitial V atoms within the van der Waals interlayers. We find that lithium ion migration destroys the cationic orderings and leads to a phase transition from superstructure to nonsuperstructure. This phase transition is reversible, that is, the superstructure returns back after extraction of lithium ion from Li yV1+ xSe2. These findings provide valuable insights into understanding and controlling the structure and properties of 2D materials by general ionic and electric doping.
Related Concept Videos
The Energies of Atomic Orbitals
Atomic Structure
Atomic Mass
Atomic Orbitals
pH Scale
Hybridization of Atomic Orbitals I

