THE EFFECTS OF LiFePO4
THE VARIED
MESOCARBON MICROBEAD
(MCMB)
COMPOSITION AND THICKNESS OF LITHIUM ION
BATTERIES CAPACITY
CATHODE THICKNESS ON
ABSTRACT
A research has been done about the manufactured of lithium ion batteries. The materials that used were of LiFePO4 powders as cathode filler, MCMB as anode filler, Super P as additives carbon, PvDf as matrix and DMAC as solvent. The composition of LiFePO4 cathode sheet the consisted of 85 % LiFePO4, 10 % Super P and 5 % PvDf in DMAC solvent with different thickness of 100 µm, 150 µm and 300 µm. The same composition of MCMB anode sheet as LiFePO4
cathode sheet with varied thickness of 100 μm and 150 μm and varied
composition of 85 : 10 : 5 and 80 : 13 : 7 with a thickness of 150 µm. The electrode sheets prepared by using sheet casting based on doctor blade and assembling process of batteries cells by using stacking method with prismatic batteries model. The batteries used liquid electrolytes was 1M LiPF6 and polyolefin seperator. The analysis of crystal structure on active material powders were examined by using XRD, surface morphology and particle size on active material powder and morphology LiFePO4 cathode sheet analyzed by using SEM, surface morphology of the electrode sheets by using Optical Microscope and battery capacity by BST8-10A30V. The results of research showed that the
highest capacity is 300 μm cathode thickness and the smallest is 100 µm
thickness. The influence of varied composition for MCMB anode, the composition of 80 : 13 : 7 has higher specific capacity at cathode thickness of 100 µm, 150 µm and 300 µm with each has specific capacity is 69,65 mAh/gr, 73,61 mAh/gr and 81,93 mAh/gr. Each battery has efficiency above 98 %. The
varied thickness of MCMB anode, so the thickness of 100 μm has a higher
specific capacity at cathode thickness of 100 µm, 150 µm and 300 µm with each has specific capacity is 79,10 mAh/gr, 82,54 mAh/gr and 88 mAh/gr. The efficiency of each battery above 99 %. The highest battery capacity and efficiency at 300 µm cathode thickness reached 88 mAh/gr with MCMB anode composition
of 85 : 10 : 5 at 100 μm thickness.
Keywords: lithium ion batteries, LiFePO4 cathode, MCMB anode,
charge-discharge.
