Rational engineering of high-entropy oxides for Li-ion battery anodes with finely tuned combustion syntheses

Dongjoon Shin, Seunghoon Chae, Seonghyun Park, Byungseok Seo, Wonjoon Choi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

High-entropy oxides (HEOs) are promising conversion-type anode materials for Li-ion batteries (LIBs) owing to their excellent cycling stabilities and rate capabilities. However, the conventional syntheses and screening processes are time-consuming and complex and require phase and interfacial segregation of individual elements. Herein, we report a rational screening strategy for LIB anodes using precisely tunable HEOs fabricated by one-step combustion syntheses with different fuel-to-oxidizer ratios (φ). A slightly lean fuel mixture (φ-0.95) enabled a suitable temperature and non-reducing atmosphere for optimal HEO syntheses. This provided high crystallinity, perfectly homogeneous elemental distributions, and adequate pore structures without selective precipitation, whereas lower or higher fuel-to-oxidizer ratios resulted in excessively porous morphologies or elemental segregation. HEO-based anodes with φ-0.95 exhibited outstanding specific capacities (1165 mAh g−1, 80.9% retention at 0.1 A g−1, and 791 mAh g−1 even at 3 A g−1), excellent rate capabilities, and stable cycling lifetimes (1252 mAh g−1, 80.9% retention after 100 cycles at 0.2 A g−1). This design strategy will provide fascinating HEO electrodes that cannot be prepared with conventional fabrication methods.

Original languageEnglish
Article number54
JournalNPG Asia Materials
Volume15
Issue number1
DOIs
Publication statusPublished - 2023 Dec

Bibliographical note

Publisher Copyright:
© 2023, Nature Japan KK.

ASJC Scopus subject areas

  • Modelling and Simulation
  • General Materials Science
  • Condensed Matter Physics

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