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.
Capacity fading mechanism of large scale Li4Ti5O12/LiCoO2 battery
2014-08-01
1119693 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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