Aging property for LiFePO4/graphite cell with different temperature and DODs
In this paper, we fabricated 1.7 A h soft packed cells using commercial grade LiFePO4 and manmade graphite as the active materials for the cathode and anode, respectively. It has been shown that the cycle performances of assembled soft packed full cell were still temperature dependent. An accelerated mechanism of the operating temperature to reformation/repairing of SEI layer have been established, which greatly consumes active lithium during cycling, therefore causes fast capacity loss at elevated temperatures. At same time, cycle property for LiFePO4/graphite cell with different depth of discharge (DOD) levels and ranges. It has been shown that DOD level has very little effect on capacity fade for cell lifecycle; but for DOD range, obvious influence was observed on capacity fade, which is due to the sensitivity of SOC during the storage of the cell.
Russian Journal of Electrochemistry