SYNTHESIS AND CHARACTERIZATION OF POLYMER ELECTROLYTE MEMBRANES FROM CARBOXYMETHYL CHITOSAN WITH THE ADDITION OF IMIDAZOLIUM-BASED GEMINI IONIC LIQUID (C2(VIM2)LI2) FOR LITHIUM ION BATTERY APPLICATIONS

• Main Author: Ichsan Imaduddin, Ferdy
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/82883
• Institution: Institut Teknologi Bandung

One of the batteries widely used in electronic devices today is the lithium-ion battery, due to its many advantages as an energy storage device, including high energy density, long cycle life, higher operating voltage, and low self-discharging. One of the main components of lithium-ion batteries is the electrolyte, which is still using liquid-phase electrolytes. These electrolytes have many drawbacks, including a limited operating temperature range, potential to cause electrode corrosion, frequent explosions due to electrolyte leakage, and environmental pollution issues. Therefore, further development is needed to replace liquid electrolytes with solid electrolytes such as solid polymer electrolyte (SPE) membranes. One of the basic materials used as the polymer matrix is carboxymethyl chitosan. Carboxymethyl chitosan can be obtained from the carboxymethylation of chitosan, while chitosan itself can be obtained from the isolation and purification of shrimp shell waste. Carboxymethyl chitosan membranes still have a weakness, namely their relatively low ionic conductivity, which necessitates the addition of lithium acetate salt and dicationic vinyl ionic liquid to enhance their ionic conductivity. Carboxymethyl chitosan can be obtained from shrimp shell waste with a degree of substitution of 1.24. The solid polymer electrolyte membrane with optimum conditions based on ionic conductivity and mechanical properties is achieved with a composition of 0.3 grams of carboxymethyl chitosan, supplemented with 0.045 grams of C2(VIm2)Li2, yielding a Young's modulus value of 0.35 and an ionic conductivity of 3.03 x 10-3 S/cm. This solid polymer electrolyte membrane has a crystallinity degree of 61.6% with a rough and porous surface morphology, and thermal stability up to a temperature of 280?. From these results, it can be concluded that the solid polymer electrolyte membrane made from carboxymethyl chitosan with the addition of dicationic vinyl ionic liquid and lithium acetate salt has the potential to be used as a solid electrolyte in lithium-ion battery cell applications.