Molecular dynamics simulations of solvent effects on the crystal morphology of lithium carbonate

Hang Chen; Shaojun Duan; Yuzhu Sun; Xingfu Song; Jianguo Yu

doi:10.1039/c9ra07909b

Molecular dynamics simulations of solvent effects on the crystal morphology of lithium carbonate

RSC Adv. 2020 Feb 4;10(10):5604-5609. doi: 10.1039/c9ra07909b.

Authors

Hang Chen^{1

2

3}, Shaojun Duan^{1

2}, Yuzhu Sun^{1

2

3}, Xingfu Song^{1

2

3}, Jianguo Yu^{1

2}

Affiliations

¹ Engineering Research Center of Resource Process Engineering, Ministry of Education Shanghai 200237 China.
² National Engineering Research Center for Integrated Utilization of Salt Lake Resource, East China University of Science and Technology Shanghai 200237 China yzsun@ecust.edu.cn xfsong@ecust.edu.cn +86-21-64252346 +86-21-64252346.
³ Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China.

Abstract

The attachment energy (AE) model was employed to investigate the growth morphology of Li₂CO₃ under vacuum and water solvent conditions by molecular dynamics simulations. The attachment energy calculation predicted the growth morphology in vacuum dominated by the (1 1 -1), (0 0 2) and (1 1 0) crystal faces. A modified attachment energy model, accounting for the surface chemistry and the corresponding topography of the habit crystal plane, was established to predict the morphological importance of crystal faces in a water solvent. Moreover, radial distribution function (RDF) and diffusion coefficient analyses were performed to explore the adsorption and diffusion behaviors of solvent molecules on the Li₂CO₃ crystal faces. The calculated results showed that with the solvent effects, the (0 0 2) and (1 1 0) faces were of great morphological importance, while the (1 1 -1) face disappeared gradually. These finally resulted in a cuboid-like Li₂CO₃ crystal. The growth morphology and the corresponding X-ray powder diffraction pattern derived from the modified AE model were in accordance with the results observed in experiments. The related model provides an important basis for the further investigation of the effects of impurities.