Phosphite as Polyanion-Based Cathode for Li-Ion Battery: Synthesis, Structure, and Electrochemistry of LiFe(HPO₃)₂

Author

Hooman Yaghoobnejad Asl
Amitava Choudhury, Missouri University of Science and TechnologyFollow

Abstract

A new lithium containing iron(III) phosphite, LiFe(HPO₃)₂, has been synthesized via a solvent-free, low temperature, solid-state synthesis route. The crystal structure of this material has been determined employing single-crystal X-ray diffraction, which indicates that the compound has a three-dimensional structure formed by isolated FeO₆ octahedral units joined together via bridging HPO₃ pseudopyramidal moieties. This arrangement leads to the formation of channels along all the three crystallographic directions, where channels along the a- and b-axes host Li⁺ ions. The compound was further characterized by TGA, IR, and Mössbauer spectroscopic techniques. Additionally, it has been demonstrated that this phase is electrochemically active toward reversible intercalation of Li⁺ ions and thus can be used as a cathode material in Li-ion cells. An average discharge potential of 2.8 V and a practical capacity of 70 mAh·g^-1 has been achieved as indicated by the results of cyclic voltammetry and galvanostatic charge-discharge tests.

Recommended Citation

H. Yaghoobnejad Asl and A. Choudhury, "Phosphite as Polyanion-Based Cathode for Li-Ion Battery: Synthesis, Structure, and Electrochemistry of LiFe(HPO₃)₂," Inorganic Chemistry, vol. 54, no. 13, pp. 6566 - 6572, American Chemical Society (ACS), Jul 2015.

The definitive version is available at https://doi.org/10.1021/acs.inorgchem.5b00900

Department(s)

Chemistry

International Standard Serial Number (ISSN)

0020-1669

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Jul 2015