Optimasi Performansi Baterai Li-Ion Dengan Penambahan Surfaktan Pluronic P123 Pada Katoda Baterai LiMnFeCoPO4/C

The cathode is the positive electrodes of a battery, and it play role in the discharge process. The cathode modification was carried out by adding a surfactant polymer to improve the performance of the lithium battery. Surfactant pluronic 123 (P123) was used as bleeding on the cathode surface. The cathode in this research is LiMnFeCoPO4/C (LMP/C), it is the development of the LiFePO4 (LFP) cathode. The characterizations used are Electrochemical Impedance Spectroscopy (EIS) and Field Emission Scanning Electron Microscopy (FESEM). The variations of P123 were 0 wt% and 0.2 wt%. EIS characterization was used to determine the resistance and ionic conductivity, while FESEM was used to analyze the morphology and diameter distribution of the cathode particles. The results show that P123 can impact the cathode, such as charge-transfer resistance (Rct), ionic conductivity, and particle diameter distribution. The addition of P123 mass increases the Rct by 217 Ω and 1030 Ω. In addition, the ionic conductivity is 1.14×10-5 S/cm2 and 2.41×10-6 S/cm2. The particle size of the cathode decrease, but there is agglomeration. This study concludes that P123 impacts the morphological structure and electrical performance of LMP/C

Properties of Pineapple Leaf Fibers with Paper Waste as An Absorbing-Composite to Reduce Noise

Natural product-based noise-absorbing composite can be an alternative to replace synthetic fiber because of its advantages of high strength, toughness, low price, and abundance to reduce noise. The materials used were pineapple leaf fibers with paper waste. This research aims to study the advantage of natural products to reduce noise by analyzing the coefficient of sound absorption and impact strength to evaluate the absorbing composite. The composites were tested with the Charpy method with ISO 11654 standard and ASTM E23 for sound absorption and impact strength. Sound absorption was carried out using an impedance tube at a frequency range of 250 – 3000 Hz. The volume fraction of pineapple leaf fibers, paper waste, and resin epoxy concentrations were 20% : 30% : 50%, 25% : 25% : 50%, and 30% : 20% : 50%. The thickness for the sound absorption coefficient was 2 cm and 3 cm, while the thickness of the impact strength was 0.5 cm. The highest sound absorption coefficient of pineapple leaf fibers composite for 30% : 20% : 50% volume fraction was 0.788 for sample 2 cm. The highest impact strength for 20% : 30% : 50% volume fraction of the thickness of 0.5 cm was 3.527 J/mm2. The results of the sound absorption coefficient will increase if used more pineapple leaf fibers but it will decrease the impact strength. Based on this research, the pineapple leaf fibers will improve the quality of the composite that can be used as a sound-absorbing material as well. These materials possess the promising potential to decrease waste and are used in industries for a low cost