SYNTHESIS AND CHARACTERIZATION OF CHITOSAN/LICLO4/CROSSLINK H2SO4-BASED MEMBRANES FOR LITHIUM ION BATTERIES APPLICATION

• Main Author: SERLY GEMBO NIM: 20516026, HANDRIANI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/27681
• Institution: Institut Teknologi Bandung

Lithium ion batteries are the most widely used commercial batteries today due to their advantages such as high energy capacity, durability, lightness and efficient use. However, the use of liquid electrolytes in lithium ion batteries proved to cause many losses such as high risk of leakage, corrosive and combustible when charging the battery at high temperatures. The polymer electrolyte is an appropriate alternative to replace liquid electrolyte and simultaneously acts as a separator between anode and cathode of the battery. Chitosan is one of the best choice to serve as a polymer electrolyte because of its abundant presence in nature, excellent mechanical strength, easiness to modify and biodegradability. The main disadvantage of chitosan is its low conductivity. Addition of LiClO4 was indeed able to increase chitosan conductivity, but on the other hand could lower the mechanical strength. Therefore, crosslinking with H2SO4 was done to increase chitosan conductivity while improving its mechanical properties which decreased due to addition of LiClO4. To observe the potency of chitosan/LiClO4/crosslink H2SO4-based membranes as separator on lithium battery, ionic conductivity analysis and mechanical strength analysis were performed. The two analysis were supported by swelling degree analysis, morphological analysis, crystallinity analysis and thermal stability analysis. The results showed that the addition of LiClO4 and crosslinking with H2SO4 increased ionic conductivity and repaired the mechanical strength of chitosan. The synthesized membrane has the optimum ionic conductivity and mechanical strength of 8,37 x 10-4 S cm-1 and 38,81 MPa respectively on mass composition of chitosan: LiClO4: H2SO4 (of total chitosan mass and LiClO4) = 95: 5: 3. This electrolyte polymer has several physico-chemical characters that support its use in lithium ion battery applications such as the degree of crystallinity (24,12%) and thermal resistance (up to 308oC).