Electrochemical performance of sol-gel-made Na2Ti3O7 anode material for Na-ion batteries

0490935 - ÚFCH JH 2019 RIV DE eng J - Článek v odborném periodiku
Zukalová, Markéta - Pitňa Lásková, Barbora - Mocek, Karel - Zukal, Arnošt - Bouša, Milan - Kavan, Ladislav
Electrochemical performance of sol-gel-made Na2Ti3O7 anode material for Na-ion batteries.
Journal of Solid State Electrochemistry. Roč. 22, č. 8 (2018), s. 2545-2552. ISSN 1432-8488. E-ISSN 1433-0768
Grant CEP: GA ČR GA15-06511S
Institucionální podpora: RVO:61388955
Klíčová slova: Charge capacity * Na insertion * Na2Ti3O7 * Nanocrystalline * Sol-gel
Obor OECD: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impakt faktor: 2.531, rok: 2018

Nanocrystalline Na2Ti3O7material is prepared by a newly developed sol-gel procedure. The sol-gel made Na2Ti3O7calcined at 500 °C possesses mesoporous structure and BET surface area of 89 m2g−1. X-ray diffraction and scanning electron microscopy confirm the presence of sintered nanosheets or very small crystals of the size of 10–20 nm with short-range ordering. Electrochemical behavior of nanocrystalline Na2Ti3O7is evaluated by cyclic voltammetry of Na insertion and by galvanostatic chronopotentiometry at different charging rates. The sol-gel made Na2Ti3O7exhibits improved performance as compared to that of the microcrystalline Na2Ti3O7prepared by solid-state synthesis. Discharge capacities of optimized material at charging rates 1, 2, and 5C reach 109, 86, and 63 mAh g−1, respectively, with 100% coulombic efficiency and zero capacity drop over 50 cycles after initial conditioning. Excellent performance of Na2Ti3O7_500 is obviously an effect of its large surface area giving rise to predominantly capacitive mechanism of charge storage. Hence, sol-gel made nanocrystalline Na2Ti3O7represents promising anode material for Na-ion batteries due to its charge capacity and outstanding cycling stability.
Trvalý link: http://hdl.handle.net/11104/0285045