A Nonstoichiometric Niobium Oxide/Graphite Composite for Fast-Charge Lithium-Ion Batteries

Tongtong Li, Kuanting Liu, Gyutae Nam, Min Gyu Kim, Yong Ding, Bote Zhao*, Zheyu Luo, Zirui Wang, Weilin Zhang, Chenxi Zhao, Jeng Han Wang*, Yanyan Song*, Meilin Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Electrification of transportation has spurred the development of fast-charge energy storage devices. High-power lithium-ion batteries require electrode materials that can store lithium quickly and reversibly. Herein, the design and construction of a Nb2O5−δ/graphite composite electrode that demonstrates remarkable rate capability and durability are reported. The presence of graphite enables the formation of a dominant Nb12O29 phase and a minor T-Nb2O5 phase. The high rate capability is attributed to the enhanced electronic conductivity and lower energy barriers for fast lithium diffusion in both Nb12O29 and T-Nb2O5, as unraveled by density functional theory calculations. The excellent durability or long cycling life is originated from the coherent redox behavior of Nb ions and high reversibility of lithium intercalation/deintercalation, as revealed by operando X-ray absorption spectroscopy analysis. When tested in a half-cell at high cycling rates, the composite electrode delivers a specific capability of 120 mAh g–1 at 80 C and retains over 150 mAh g–1 after 2000 cycles at 30 C, implying that it is a highly promising anode material for fast-charging lithium-ion batteries.

Original languageEnglish
Article number2200972
JournalSmall
Volume18
Issue number26
DOIs
Publication statusPublished - 2022 Jul 1

Keywords

  • composites
  • fast charging anodes
  • lithium-ion batteries
  • nonstoichiometric niobium oxide

ASJC Scopus subject areas

  • General Chemistry
  • Engineering (miscellaneous)
  • Biotechnology
  • General Materials Science
  • Biomaterials

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