| Abstrakt: |
Commercial Samsung 25R lithium-ion battery has been used as object of reverse engineering study. The aim of this study was to observe the physical parameters and insight of the cathode materials, that became a benchmark for developing the new materials. The first method was to dismantled the cylindrical cell, into the battery components. The cathode was coated on the Al-foil with the length of 875 mm and 570 mm width, and the thickness of about 1.41 mm. Meanwhile the anode was coated on the Cu-foil with the length of 930 mm and 570 mm width, and the thickness of about 1.28 mm. The length separator was 1820 mm, twice longer from the length of electrodes, and its width wider to prevent the short circuit. The separator was the thin sheet only 0.15 mm. The inside of the cylindrical cell was almost similar to other lithium-ion battery. The XRD pattern of the cathode material was identified as layered α-NaFeO2 hexagonal structure belonged to the layered LiNi1/3Mn1/3Co1/3O2. According to the database, the diffraction pattern is the most compatible with NMC111 (ICSD 98-016-2295). It was found that, the peaks (006) and (012), as well as (018) and (110), are separated indicating the ordering of the layered hexagonal structure. The optimal c/a ratio was more than 4.899 exhibited the ideal c/a values, indicating the presence of cation mixing. A ratio of I(003)/I(104) was 2.5796, indicating desired cation mixing occurs. The sample's R value was low enough to indicate that it had good lattice ordering. In conclusion, the commercial Samsung 25R 18650 has proven to be good crystalline materials with layer NMC111. [ABSTRACT FROM AUTHOR] |
