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

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

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.

原文英語
文章編號2200972
期刊Small
18
發行號26
DOIs
出版狀態已發佈 - 2022 7月 1

ASJC Scopus subject areas

  • 生物技術
  • 化學 (全部)
  • 生物材料
  • 材料科學(全部)

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