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Electrochemical Performance of Orthorhombic CsPbI3 Perovskite in Li-Ion Batteries

Authors :
Yu-Hsun Su
Tanmoy Paul
Nahid Kaisar
Anupriya Singh
Maw-Kuen Wu
Chih-Wei Chu
Po-Wei Chi
Phillip M. Wu
Source :
Materials, Vol 14, Iss 5718, p 5718 (2021), Materials, Volume 14, Issue 19
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

A facile solution process was employed to prepare CsPbI3 as an anode material for Li-ion batteries. Rietveld refinement of the X-ray data confirms the orthorhombic phase of CsPbI3 at room temperature. As obtained from bond valence calculations, strained bonds between Pb and I are identified within PbI6 octahedral units. Morphological study shows that the as-prepared δ-CsPbI3 forms a nanorod-like structure. The XPS analysis confirm the presence of Cs (3d, 4d), Pb (4d, 4f, 5d) and I (3p, 3d, 4d). The lithiation process involves both intercalation and conversion reactions, as confirmed by cyclic voltammetry (CV) and first-principles calculations. Impedance spectroscopy coupled with the distribution function of relaxation times identifies charge transfer processes due to Li metal foil and anode/electrolyte interfaces. An initial discharge capacity of 151 mAhg−1 is found to continuously increase to reach a maximum of ~275 mAhg−1 at 65 cycles, while it drops to ~240 mAhg−1 at 75 cycles and then slowly decreases to 235 mAhg−1 at 100 cycles. Considering the performance and structural integrity during electrochemical performance, δ-CsPbI3 is a promising material for future Li-ion battery (LIB) application.

Details

ISSN :
19961944
Volume :
14
Database :
OpenAIRE
Journal :
Materials
Accession number :
edsair.doi.dedup.....0d7ddcdc0bf5500793a1a74ac17041b8
Full Text :
https://doi.org/10.3390/ma14195718