Gamma Polymorph Of Vanadium Oxy-Selenite And Its Solid-State Li-Ion Electrochemistry

Abstract

Mildly-lithiated form of the gamma polymorph of vanadium oxyselenite, LixV2O3(SeO3)2 (x ∼ 0.25) is synthesized in pure phase by a low-temperature one-step flux growth method. The compound is characterized using single-crystal and powder X-ray diffraction, FTIR, and DRS spectroscopic methods. The single-crystal X-ray diffraction study reveals that the compound forms a two-dimensional (2D) layered structure with the layers formed by corner-shared VO6 octahedra interconnected by SeO3 pyramidal units. A small amount of Li-ions reside in the grooves of the undulated layers. These 2D layers are stacked along the c-axis and held together by ionic and van der Waals forces. The interlayer space thus offers the possibility of ion intercalation through reductive insertion. To explore this possibility the compound is subjected to chemical and electrochemical reductive insertion of lithium. The compound has shown the capability of electrochemical intercalation of Li+ at different voltage ranges. At least 0.5 mol of Li+ could be intercalated reversibly in a topotactic manner for 100 cycles when the voltage window was limited between 2.7 V–4.2V.

Department(s)

Chemistry

Comments

University of Missouri, Grant None

International Standard Serial Number (ISSN)

1095-726X; 0022-4596

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

01 Apr 2024

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