Effect of NaCl Impurity in TiO2 on Li4Ti5O12 Formation

Wednesday, 4 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)


Li4Ti5O12 with high purity and high crystallinity is essential as anode for lithium ion battery. The unwanted impurity of rutile TiO2 in Li4Ti5O12 which results a reduced electrochemical performance as anode material for lithium ion battery. The solid-state synthesis is the most favorable to produce the large scale Li4Ti5O12 for lithium ion battery due to low-cost and environmental friendly. However, the rutile TiO2 often exists in Li4Ti5O12 prepared via the solid-state synthesis route using TiO2 and Li2CO3. The impurity in the starting reagents effects on purity and crystallinity of Li4Ti5O12 formation which has been not reported yet. In this work, it was found that NaCl impurity induced the formation of unwanted rutile TiO2 phase for the first time. The crystal structures and electrochemical properties were compared for the Li4Ti5O12 prepared from pure TiO2 and TiO2 with NaCl impurity. The high purity and high crystallinity of Li4Ti5O12 prepared from the TiO2 without NaCl impurity, which displayed high capacity, excellent cyclic performance and good rate capability compared that of Li4Ti5O12 prepared from TiO2 with NaCl impurity.