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Issue 26, 2016
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Understanding structural stability of monoclinic LiMnO2 and NaMnO2 upon de-intercalation

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Abstract

Although many strategies for Li-ion batteries have been successfully transplanted in Na-ion batteries, distinctions between these two kinds of secondary batteries are still clear. For example, monoclinic-NaMnO2 demonstrates high structural stability during charging and discharging, but its iso-structured LiMnO2 transforms to a spinel upon de-lithiation and the specific capacity fades quickly with cycling. In this work, first-principles calculations were carried out to have a better understanding of their difference in structural stability upon de-intercalation. Our studies show that the Mn-ions migrate into the Li layer of LiMnO2via an interstitial tetrahedral O atom when a triple-vacancy of the Li-ion is produced. This process follows a double-vacancy mechanism and results in blocking of the diffusion of other Li-ions. In contrast, it is very difficult for the Mn-ions to migrate into the Na layer in NaMnO2 even when triple-vacancies are generated. The drastic differences between LiMnO2 and NaMnO2 in charge distribution and in the length of the Mn–O bond are believed to be responsible for the Mn-ion migration in them. These findings provide revelations for understanding the de-intercalation behaviors of electrode materials for Li- and Na-ion batteries as well as insights into the structural stability of LiMnO2vs. NaMnO2 upon alkali metal ion de-intercalation.

Graphical abstract: Understanding structural stability of monoclinic LiMnO2 and NaMnO2 upon de-intercalation

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Supplementary files

Article information


Submitted
27 Mar 2016
Accepted
03 Jun 2016
First published
17 Jun 2016

Phys. Chem. Chem. Phys., 2016,18, 17345-17350
Article type
Communication

Understanding structural stability of monoclinic LiMnO2 and NaMnO2 upon de-intercalation

M. Tian, Y. Gao, Z. Wang and L. Chen, Phys. Chem. Chem. Phys., 2016, 18, 17345 DOI: 10.1039/C6CP02019D

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