SYNTHESIS AND CHARACTERIZATION OF SUCCINYL CHITOSAN - LITHIUM ION AS SOLID POLYMER ELECTROLYTE

• Main Author: Fauzi, Iqbal
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/32800
• Institution: Institut Teknologi Bandung

The needs of secondary batteries are increasing every year. This increase is caused by the increase in human needs of electronic devices. Secondary batteries using liquid electrolyte has weaknesses, such as prone to leakage and difficulty of packing. Solid polymer electrolyte is a solution to the existing problems. This study was conducted to determine the effect of succinyl groups and lithium perchlorate on chitosan membrane as the electrolyte. Chitosan is obtained by reacting chitosan with succinic anhydride. Polymer electrolyte membranes were derived from succinyl chitosan with various compositions of lithium perchlorate. The effects of the composition of each component to the known properties of the polymer electrolyte were characterized through the analysis of the functional groups by FTIR (Fourier Transform Infrared), degree of substitution by NMR (Nuclear Magnetic Resonance), conductivity by EIS (Electrochemical Impedance Spectroscopy), and the mechanical properties by Tensile Tester. The degree of deacetylation of chitosan was determined by FTIR spectrum. The degree of deacetylation value of chitosan obtained was 79.26%. Relative molecular mass () of chitosan obtained by viscometry method is 691,053 g/mol. Synthesis of succinyl chitosan has been successfully carried out, which is indicated by the characteristic peaks at wave numbers of 1640 cm-1 and 1560 cm-1 that correspond to -C=O stretching and -NH bending of succinyl groups on FTIR spectrum of succinyl chitosan. Modification of chitosan by the addition of succinyl group increases the membrane ionic conductivity values. Chitosan membrane conductivity is 2.88 x 10-6 S.cm-1, while the conductivity after adding succinyl group with degree of substitution (DS) of 70.84 % was increased to 1.04 x 10-3 S.cm-1. A Succinyl chitosan membrane (DS=70.84 %) contained of 5% (w/w) lithium perchlorate showed conductivity of 8.04 x10-2 S.cm-1 and mechanical resistance of 53.33 MPa, therefore succinyl chitosan – lithium ionmembrane contained of 5% (w/w) lithium perchlorate has a potent to be used as polymer electrolyte in lithium battery applications.