Ventosa Edgar, Xia Wei, Klink Stefan, La Mantia Fabio, Mei Bastian, Muhler Martin, Schuhmann Wolfgang
Analytische Chemie - Elektroanalytik & Sensorik, Ruhr-Universität Bochum, Universitätsstrasse 150, 44780 Bochum (Germany), Fax: (+49) 2343214683.
Chemistry. 2013 Oct 11;19(42):14194-9. doi: 10.1002/chem.201302306. Epub 2013 Sep 11.
Improving the chemical diffusion of Li ions in anatase TiO2 is essential to enhance its rate capability as a negative electrode for Li-ion batteries. Ammonia annealing has been used to improve the rate capability of Li4 Ti5 O12 . Similarly, ammonia annealing improves the Li-ion storage performance of anatase TiO2 in terms of the stability upon cycling and the C-rate capability. In order to distinguish whether N doping or oxygen deficiencies, both introduced upon ammonia annealing, are more relevant for the observed improvement, a systematic electrochemical study was performed. The results suggest that the creation of oxygen vacancies upon ammonia annealing is the main reason for the improvement of the stability and C-rate capability.
提高锂离子在锐钛矿型二氧化钛中的化学扩散速率对于增强其作为锂离子电池负极的倍率性能至关重要。氨退火已被用于提高Li4Ti5O12的倍率性能。同样，氨退火在循环稳定性和C倍率性能方面提高了锐钛矿型二氧化钛的锂离子存储性能。为了区分氨退火引入的N掺杂或氧缺陷对观察到的性能改善哪个更重要，进行了系统的电化学研究。结果表明，氨退火过程中氧空位的产生是稳定性和C倍率性能提高的主要原因。
