Ammonia-Annealed TiO2 as a Negative Electrode Material in Li-Ion Batteries: N Doping or Oxygen Deficiency?

作者：Ventosa Edgar^*; Xia Wei; Klink Stefan; La Mantia Fabio; Mei Bastian; Muhler Martin; Schuhmann Wolfgang

来源：Chemistry - A European Journal, 2013, 19(42): 14194-14199.

DOI：10.1002/chem.201302306

• high C rate
• lithium-ion battery
• nitrogen dopant
• oxygen deficiency
• titanium dioxide

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 Li4Ti5O12. 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.

• 出版日期2013-10-11