Title :
Capacity fading mechanism of large scale Li4Ti5O12/LiCoO2 battery
Author :
Ke Wu ; Ya Gao ; Xiaoman Sun ; Sha Liu ; Ningning Wu ; Hailei Zhao ; Yingchun Zhang
Author_Institution :
Sch. of Mater. Sci. & Eng., Univ. of Sci. & Technol. Beijing, Beijing, China
fDate :
Aug. 31 2014-Sept. 3 2014
Abstract :
Lithium titanate battery suffers from high capacity fade for elevated temperature operation. In order to gain new insights into the underlying degradation mechanism of this problem, Li4Ti5O12/LiCoO2 battery with 8Ah capacity was assembled and its storage and cycling performance at 60°C were investigated. Electrochemical impedance spectroscopy (EIS) of cells during cycling were measured with two-electrode and three-electrode 8Ah pouch cells. XRD, SEM and half-cell characterization of the cycled cells were analyzed. Accelerating Rate Calorimeter was used to monitor the battery surface temperature during cycling at 60° and 3C rate. The results showed that the capacity fade of this cell was mainly caused by degradation of LiCoO2 cathode.
Keywords :
X-ray diffraction; electrochemical electrodes; lithium compounds; scanning electron microscopy; secondary cells; Li4Ti5O12-LiCoO2; SEM; XRD; capacity fading mechanism; cycling performance; electrochemical impedance spectroscopy; half-cell characterization; large scale battery; temperature 60 C; three electrode pouch cell; two electrode pouch cell; Anodes; Batteries; Cathodes; Impedance; Lithium; Materials; Li4Ti5O12; capacity fading mechanism; lithium ion battery;
Conference_Titel :
Transportation Electrification Asia-Pacific (ITEC Asia-Pacific), 2014 IEEE Conference and Expo
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-4240-4
DOI :
10.1109/ITEC-AP.2014.6940726
