Mixed-Phase Niobium Oxide as a Durable and Ultra-Fast Charging Anode for High-Power Lithium-Ion Batteries

Yoojin Ahn, Tongtong Li, Shengchi Huang, Yong Ding, Shineui Hwang, Weining Wang, Zheyu Luo, Jeng Han Wang*, Gyutae Nam*, Meilin Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The development of low-cost, high-power lithium-ion batteries requires durable anode materials that can store and release lithium quickly. Here a mixed phase of H-Nb2O5 and M-Nb2O5 (denoted as d-H,M-Nb2O5) that demonstrates excellent performance as an anode material for lithium storage is reported. Experimental and computational analyses reveal several salient features of d-H,M-Nb2O5. First, the edge-sharing arrangement between the mixed niobium oxygen polyhedral block structures helps alleviate volume expansion during cycling, thereby enhancing stability and reversibility. Second, the mixed-phase structure facilitates a continuous pathway for lithium ion adsorption These characteristics allow for sequential transport of lithium ions, enabling fast charging. As a result, the d-H,M-Nb2O5 electrode material exhibits a high capacity of 142 mAh g−1 at an ultra-fast charging rate of 100 C, while maintaining 85% of its initial capacity after 5000 cycles. Moreover, its practical feasibility is established by demonstrating full-cell performance at a 5 C discharge/charge rate (13 mA cm−2), maintaining 79% of its capacity over 1000 cycles.

Original languageEnglish
Article number2310853
JournalAdvanced Functional Materials
Volume34
Issue number8
DOIs
Publication statusPublished - 2024 Feb 19

Keywords

  • anodes
  • lithium-ion batteries
  • niobium oxides
  • structural defects

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Condensed Matter Physics
  • Electrochemistry

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