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Polymorphic Purity and Structural Charge–Discharge Evolution of β-LiVOPO4 Cathodes

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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
JournalThe Journal of Physical Chemistry Part C
Pages (from-to)24301-24309
Number of pages9
Publication statusPublished - 11 Nov 2021

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