SYNTHESIS OF POLYMER ELECTROLYTE MEMRANES FROM CELLULOSE ACETATE/POLY(ETHYLENE OXIDE)/LiClO4 FOR LITHIUM ION BATTERY APPLICATION

• Main Author: Nurhadini
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/32379
• Institution: Institut Teknologi Bandung

Nowadays, the development of portable electronic devices, especially mobile phones and notebook computers has been increasing significantly leading to a strong need of high-energy batteries. Lithium ion batteries are the most promising answer for this requirement. It has higher-energy density, longer cycle life, higher operational voltage, and lighter weight compared to batteries with lead acid, NiCd or NiMH. These batteries usually use liquid electrolyte causing has some weaknesses such as limited temperature range of operation, causes corrosion in the electrodes, leakage and short circuiting of the batteries. One way to minimize it is using a polymer electrolyte that served as electrolyte and separator. This study was conducted to determine the effect of cellulose acetate on poly(ethylene oxide) and LiClO4 membranes as the polymer electrolyte. Poly(ethylene oxide) (PEO) always used as a polymer host for the polymer electrolyte due to it has high chemical and thermal stabilities, non toxic, and fast ion transport. Cellulose acetate is used as an additive to increase ionic conductivity and mechanical property of polymer electrolyte membranes. Based on infra red data showed that cellulose acetate decreased crystalline fraction of PEO. The increase the percentage of cellulose acetate in membranes is no significantly effect on the ionic conductivity with maximum conductivity 5,7 x 10-4 S/cm in 25/60/15 (SA/PEO/LiClO4) composition. Modulus Young of membranes increase with the increase percentage of cellulose acetate in polymer electrolyte membranes indicating this polymer electrolyte is more rigid with Modulus Young 0,528 MPa in 25/60/15 (SA/PEO/LiClO4) composition. Based on TGA analysis, the increasing PEO percentage in membrane could increase the thermal stability and this polymer electrolyte is thermally stable until 270 ?C. Polymer electrolyte membranes prepared by blending synthetic cellulose acetate/PEO/LiClO4 have higher ionic conductivity, but the mechanical strength and thermal stability are lower than that commercial cellulose acetate/PEO/LiClO4. The polymer electrolyte membrane from cellulose acetate, poly(ethylene oxide), and lithium chlorate could be potentially used as a polymer electrolyte membrane for lithium ion battery application.