Ionic Liquid–Directed Nanoporous TiNb2O7 Anodes with Superior Performance for Fast–Rechargeable Lithium–Ion Batteries

Tao, Runming; Yang, Guang; Self, Ethan C.; Liang, Jiyuan; Dunlap, John R.; Men, Shuang; Do‐Thanh, Chi‐Linh; Liu, Jixing; Zhang, Yiman; Zhao, Sheng; Lyu, Hailong; Sokolov, Alexei P.; Nanda, Jagjit; Sun, Xiao‐Guang; Dai, Sheng

doi:10.1002/smll.202001884

Title: Ionic Liquid–Directed Nanoporous TiNb₂O₇ Anodes with Superior Performance for Fast–Rechargeable Lithium–Ion Batteries

Journal Article · Mon Jun 22 00:00:00 EDT 2020 · Small

DOI:https://doi.org/10.1002/smll.202001884· OSTI ID:1669739

Tao, Runming ^[1];

^[2];

^[2]; Liang, Jiyuan ^[3]; Dunlap, John R. ^[3]; Men, Shuang ^[2]; Do‐Thanh, Chi‐Linh ^[3]; Liu, Jixing ^[3];

^[2]; Zhao, Sheng ^[1]; Lyu, Hailong ^[1];

^[3];

^[2];

^[1]

University of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
University of Tennessee, Knoxville, TN (United States)

Nanoporous TiNb2O7 (NPTNO) material is synthesized by a sol–gel method with an ionic liquid (IL) as the nanoporous structure directing template. NPTNO exhibits a high reversible capacity of 210 mAh g–1 even at the charging rate of 50 C and an excellent cyclability of half-cell capacity retention of 74% for 1000 cycles at 5 C and LiNi0.5Mn1.5O4-coupled full-cell capacity retentions of 81% and 87% for 1000 cycles at 1 C and 2 C, respectively. The studies of the 1000 cycled NPTNO electrode illustrate that the IL-directed mesoporous structure can enhance the cyclability of NPTNO cells due to the alleviation of repetitive mechanical stress and volume fluctuation induced by the repetitive Li+ insertion-extraction processes. The measured Li+ diffusion coefficients from the galvanostatic intermittent titration technique suggest that the IL-templating strategy indeed ensures the fast rechargeability of NPTNO cells based on the fast Li+ diffusion kinetics. Benefitting from the nanoporous structure, NPTNO with unhindered Li+ diffusion pathways achieves a superior rate capability in the titanium-based oxide materials and the best full-cell cyclability in the TNO materials. Therefore, the templating potential of IL is demonstrated, and the superb electrochemical performance establishes the IL-directed NPTNO as a promising anode candidate for fast-rechargeable LIBs.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; AC05‐00OR22725

OSTI ID:: 1669739

Alternate ID(s):: OSTI ID: 1638416; OSTI ID: 1822080

Journal Information:: Small, Vol. 16, Issue 29; ISSN 1613-6810

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 62 works

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