IONIC LIQUIDS (ILs)-BASED ELECTROLYTES SYSTEM FOR LITHIUM ION BATTERIES

• Main Author: OLIVIA NANDIKA (NIM:20616035), ASTRID
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/25884
• Institution: Institut Teknologi Bandung

Electrolytes system play an important part in Lithium Ion Batteries (LIBs) due its role <br /> <br /> in lithium ion (Li+) transport between anode and cathode. Commercial LIBs used <br /> <br /> organic carbonates compound electrolytes system, but these electrolytes are <br /> <br /> flammable and volatile. For these reasons, modification of electrolytes system with <br /> <br /> non-volatile, non-flammable compounds and has high conductivity becoming recent <br /> <br /> research focus. It is already known that ionic liquids have high conductivity and as <br /> <br /> non-volatile compound. Based on these properties, ionic liquids (ILs) expected to <br /> <br /> cover the lack of the organic carbonates-based electrolyte system in LIBs. The <br /> <br /> conductivity of electrolytes system which consists of dimethyl carbonate <br /> <br /> (DMC)/diethyl carbonate (DEC) (1:1, v/v) as organic solvent (OS) and imidazolebased <br /> <br /> ILs measured at various temperature. Meanwhile, the thermal stability of the <br /> <br /> electrolytes system also measured, and the redox properties of lithium ion in IL-based <br /> <br /> electrolyte system, was investigated. The electrolyte conductivity of [bmim][BF4]- <br /> <br /> based reached ~13 mS cm-1 at 20 °C which is 10000 times higher than DMC/DEC <br /> <br /> based only. Thermal analysis showed that decomposition temperature of the IL-based <br /> <br /> electrolytes reached 360 °C, which is more stable than organic-based only (~110 °C). <br /> <br /> Cyclic voltammetry measurement showed that the IL-based electrolytes with <br /> <br /> composition [bmim][BF4]: DEC: DMC (3:1:1) + LiBF4 0.2M has quasi-reversible <br /> <br /> redox reaction. Charge-discharge performance showed that LIBs cell with IL-based <br /> <br /> electrolyte has 2 times higher (67.38%) coulombic efficiency than organic based <br /> <br /> (25.76%). The existence of [bmim][BF4] affect the conductivity and thermal stability <br /> <br /> of elctrolytes system. Based on these results, a mixture between ILs and organic <br /> <br /> solvent has a potential to become a new electrolytes system in the next Lithium Ion <br /> <br /> Batteries. <br /> <br /> Keywords: Conductivity