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Ionic Liquid鈥怐irected Nanoporous TiNb2O7 Anodes with Superior Performance for Fast鈥怰echargeable Lithium鈥怚on Batteries...

Publication Type
Journal
Journal Name
Small
Publication Date
Volume
16
Issue
29

Nanoporous TiNb2O7 (NPTNO) material is synthesized by a sol鈥揼el method with an ionic liquid (IL) as the nanoporous structure directing template. NPTNO exhibits a high reversible capacity of 210 mAh g鈥�1 even at the charging rate of 50 C and an excellent cyclability of half鈥恈ell capacity retention of 74% for 1000 cycles at 5 C and LiNi0.5Mn1.5O4鈥恈oupled full鈥恈ell 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鈥恉irected 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鈥恊xtraction processes. The measured Li+ diffusion coefficients from the galvanostatic intermittent titration technique suggest that the IL鈥恡emplating 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鈥恇ased oxide materials and the best full鈥恈ell cyclability in the TNO materials. Therefore, the templating potential of IL is demonstrated, and the superb electrochemical performance establishes the IL鈥恉irected NPTNO as a promising anode candidate for fast鈥恟echargeable LIBs.