Doctoral Dissertations

Keywords and Phrases

Battery materials; Li-ion batteries; Materials synthesis; Polyanion cathodes

Abstract

The escalating global demand for sustainable energy storage solutions has driven intensive research into novel electrode materials. Polyanion-based cathode materials have emerged as promising candidates due to their structural stability, safety, and voltage tunability enabled by the inductive effect of polyanionic groups. This research explores the synthesis, crystal structure, and electrochemical performance of new polyanion-based cathode materials featuring vanadium, molybdenum, and iron within phosphate and selenite frameworks.

Novel selenite-based materials, such as LiFe(SeO₃)₂ and Li₀.₂₅V₂O₃(SeO₃)₂, were synthesized and characterized, revealing stable electrochemical cycling associated with Fe2+/Fe3+ and V⁴⁺/V⁵⁺ transitions. Additionally, a systematic investigation was conducted on molybdenum phosphate compounds, including hydrated and anhydrous analogs of Li0.89Mo2O1.89F0.11(PO4)2(H2PO4)∙xH2O and Li₃Mo₂O₂(PO₄)₃. These frameworks exhibit open channels that support reversible lithium and sodium ion intercalation and demonstrate multielectron redox activity involving Mo⁴⁺/Mo⁶⁺ couples. These compounds exhibit structural integrity during Li-ion insertion enabling reversible Li intercalation.

This research contributes to the broader understanding of how multivalent redox chemistry, polyanion selection, and structural design converge to create safe and high-capacity cathodes. The findings highlight the potential of polyanion frameworks to meet the performance and longevity requirements of next-generation lithium and sodium-ion batteries.

Advisor(s)

Choudhury, Amitava

Committee Member(s)

Chernatynskiy, Aleksandr V.
Woelk, Klaus
Nath, Manashi
Stavropoulos, Pericles

Department(s)

Chemistry

Degree Name

Ph. D. in Chemistry

Publisher

Missouri University of Science and Technology

Publication Date

Winter 2026

Journal article titles appearing in thesis/dissertation

Paper I, found on pages 24–56, has been submitted to Journal of Solid-State Chemistry.

Paper II, found on pages 57–118, has been published in ACS Applied Energy Materials.

Paper III, found on pages 119–168, has been published in Zeitschrift für anorganische und allgemeine Chemie (ZAAC).

Pagination

xiv, 176 pages

Note about bibliography

Includes_bibliographical_references_(pages 171-175)

Rights

© 2026 Sutapa Bhattacharya, All Rights Reserved

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 12585

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Included in

Chemistry Commons

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