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- Title
Deposition of Horizontally Stacked Zn Crystals on Single Layer 1T‐VSe<sub>2</sub> for Dendrite‐Free Zn Metal Anodes.
- Authors
Li, Yuyin; Wong, Hoilun; Wang, Jun; Peng, Weiliang; Shen, Yidi; Xu, Mengyang; An, Qi; Kim, Jang‐Kyo; Yuan, Bin; Goddard, William A.; Luo, Zhengtang
- Abstract
Owing to the moderate redox potential and high safety, Zn metal anodes have been garnering great attention. However, the poor reversibility and limited‐service period caused by side reactions and dendrites hinder their applications. Here, a novel anode material consisting of a hexagonal 1T‐Vanadium diselenide (1T‐VSe2) film on graphene is developed as a zincophilic template to epitaxially electrodeposit hexagonal closest packed Zn to replace the conventional metal substrates in Zn batteries. The 1T‐VSe2/Zn anode induces a horizontally (002)‐oriented plate‐like Zn crystal deposition morphology instead of randomly oriented grains that prompts the compact Zn deposition. According to density functional theory calculations, the VSe2 substrate exhibits a higher Zn adsorption (−0.54 eV) than the graphene (−0.38 eV) or neat Zn (−0.48 eV) counterparts, leading to the enhanced zincophilicity and a lower nucleation overpotential, in agreement with the experimental results. The force field‐based molecular dynamics simulations visualize Zn nucleation and morphological evolution at the atomistic level. The rapid adatom diffusion on VSe2 leads to layer‐by‐layer Zn electrodeposits with higher fraction of the (002) facets to effectively prohibit dendrite formation. The symmetric cell with 1T‐VSe2/Zn delivers an ultra‐stable cyclic life of 2500 h with 50 mV overpotential at 1 mA cm−2 and 1 mAh cm−2.
- Subjects
SINGLE crystals; ANODES; MOLECULAR dynamics; DENSITY functional theory; REDUCTION potential; BORON nitride
- Publication
Advanced Energy Materials, 2022, Vol 12, Issue 47, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.202202983