Guodong Zou¹, Jinming Wang^1,2*, Yong Sun¹, Weihao Yang¹, Tingting Niu¹, Jinyu Li¹, Liqun Ren³, Zhi Wei Seh², Qiuming Peng^1*

1 State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, P.R. China

2 Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore

3 Laboratory of Spinal Cord Injury and Rehabilitation, Chengde Medical University, Chengde 067000, P.R.China

* Corresponding authors emails: wangjinming1996@gmail.com, pengqiuming@ysu.edu.cn

DOI10.24435/materialscloud:r1-e1 [version v1]

Publication date: Jan 16, 2025

How to cite this record

Guodong Zou, Jinming Wang, Yong Sun, Weihao Yang, Tingting Niu, Jinyu Li, Liqun Ren, Zhi Wei Seh, Qiuming Peng, A nanotwinned-alloy strategy enables fast sodium deposition dynamics, Materials Cloud Archive 2025.14 (2025), https://doi.org/10.24435/materialscloud:r1-e1

Description

Sodium (Na) metal batteries are considered promising solutions for next-generation electrochemical energy storage because of their low costs and high energy densities. However, the slow Na dynamics result in unfavourable Na deposition and dendrite growth, which compromise cycling performance. Here we propose a nanotwinned alloy strategy prepared by high-pressure solid solution followed by Joule-heating treatment to address sluggish Na dynamics, achieving homogeneous Na deposition. By employing cost-effective Al-Si alloys for validation, Si solubility of 10 wt.% is extended through a high-pressure solid solution, and nanotwinned-Si particles, with a volume fraction of 82.7%, are subsequently formed through Joule-heating treatment. The sodiophilic nanotwinned-Si sites exhibit a high diffusion rate, which reduces the nondimensional electrochemical Damköhler number to far below 1, shifting the diffusion-controlled deposition behavior to reaction-controlled deposition. This transition facilitates spherical Na deposition and dendrite-free growth, allowing a symmetric cell to achieve stable Na plating/stripping over 5300 hours at 5 mA cm⁻² with a cumulative capacity of 13.25 Ah cm⁻². This strategy is also demonstrated in another CuAg system with nanotwinned Ag structures.The record contains data that support the findings described in the publication.

Materials Cloud sections using this data

Files

File name	Size	Description
Molecular dynamics data.zip MD5md5:edc774ba906b931a3e9b9759cd2e0195	5.3 MiB	The initial and final configurations of Na deposition on Al, HPA-AlSi and HPJH-AlSi using molecular dynamics simulations.
Density functional theory data.zip MD5md5:750f69aade1649c1fc14f5de509eb798	39.0 KiB	This dataset contains data related to the optimized configurations for the diffusion pathway and calculated energy profile of Na along the diffusion path of Na on the Al, Si and nanotwin Si. Moreover, it includes binding energies of different crystal facets of Al, Si and nanotwin Si with Na atoms.

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External references

Keywords

Sodium metal battery Nanotwinned alloy Dynamics