Polymorphic Purity and Structural Charge-Discharge Evolution of β-LiVOPO4Cathodes

Christian Lund Jakobsen, Kasper Skovgaard Nielsen, Per Morgen, Espen Drath Bøjesen, Dorthe Bomholdt Ravnsbæk*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Lithium vanadyl phosphate, LiVOPO4, holds interest as a Li-ion battery electrode due to the multiple active redox states of vanadium (V5+ V4+ V3+) and the high redox potential induced by vanadyl phosphate. The orthorhombic β-LiVOPO4 polymorph is of special interest owing to its low Li-ion diffusion barrier and high stability. In this work, we synthesize β-LiVOPO4 and investigate the polymorphic purity under different synthesis conditions and show that high-energy ball milling without postsintering can alter the sample morphology and thereby dramatically increase the electrochemical performance of β-LiVOPO4. Through operando powder X-ray diffraction (PXRD), the structural evolution of β-LiVOPO4 during charge and discharge is unraveled and unexpected solid solution behavior in the Li-poor β-VOPO4 is revealed.

Original languageEnglish
JournalJournal of Physical Chemistry C
Volume125
Issue number44
Pages (from-to)24301-24309
ISSN1932-7447
DOIs
Publication statusPublished - 11. Nov 2021

Bibliographical note

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© 2021 American Chemical Society.

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