Electrochemical performance of commercial li-ion battery samsung 25R cylindrical type 18650
Abstract
Samsung 18650 25R lithium-ion battery used as object of reverse engineering study was obtained from commercial market. Samsung cylindrical cell with dimension of 18 mm diameter and 650 mm was tested using a Battery Tester 5V-6A in order to study its Electrochemical performances, such as columbic efficiency, capacity retention, and capacity fading after cycled for 100 times. The cell was charged and discharged with a constant current 1250 mA, and 0.5 C-rate. All these processes were repeated for 100 cycles. The first, fifth and tenth cycles charged and discharged capacity were 2356.18 mAh and 2355.79 mAh, 2342.82 mAh and 2343.62 mAh, 2349.21 mAh and 2343.85 mAh, respectively. It is shown that the real capacity values are little lower than the data label capacity 2500 mAh (99.98%), and there was no significant change in capacity value after 10th cycles. Furthermore, the detail analysis of performance after 100th cycle, showed the charged and discharged capacity downed to 2302.22 mAh and 2302.62 mAh, respectively. There was no significant change in capacity value after 100th cycle. Reflecting to coulombic efficiency, the numbers are stable at more than 99.8%, even after the 100th cycles. Meanwhile, the capacity retention was also remained at 99.95% after the 100th cycle, showing the cyclic ability of this commercial battery was good. The first cycle of the battery gives capacity fading value at 5.77% in respect to the nominal capacity (2500 mAh) and until 100th cycle the value raised to 7.94%, which still in acceptable value (up to 40% capacity fading). It can be concluded that this commercial battery has proved a very stable performance.
Authors
Kartini, E; Kristianto, SA; Drew, AJ; Sudjatno, ACollections
- Condensed Matter Physics [107]