THE 15~(th) INTERNATONAL CONFERENCE QUALITY IN RESARCH (QIR) 2017 PREPARATION AND IONIC CONDUCTIVITY OF Li^Cao.iTisOn USING WASTE CHICKEN EGGSHELLS AS Ca SOURCE FOR ANODE MATERIAL OF LITHIUM-ION BATTERIES

摘要

Li3.9Ca0.1Ti5O_(12) has been synthesized as anode material for lithium-ion batteries parallel with Li4Ti5O12 anode material using solid state reaction method in an air atmosphere. LiOH.H2O, TiO2, and waste chicken eggshells in the form of CaCO3 were chosen as sources of Li, Ti, and Ca respectively and prepared using stoichiometric. The phase structure, morphology, and electrochemical impedance of as-prepared samples were characterized using XRD, SEM, and EIS. The XRD characterization revealed that in Li3.9Cao.1Ti5O_(12) sample, all amount of dopant had entered the lattice structure of Li4Ti5O_(12). The EDX image also detect the existence of Ca in the structure of Li3.9Cao.1Ti5O_(12). The EIS characterization revealed that the Li3.9Cao.1Ti5O_(12) sample had lower electrochemical impedance compared to the Li4Ti5O_(12)sample. The diffusion coefficient were obtained by Faraday's method, and exhibited that the Li3.9Ca0.1Ti5O_(12) sample (1.46986 x 10~(12) cm~2/s) had higher ionic conductivity than the Li4Ti5O_(12) sample (4.40995 x 10~(-16) cm~2/s). According to the cycle performance test, the Li3.9Ca0.1Ti5O_(12) sample also had higher charge-discharge capacity and stability compared to the Li4Ti5O_(12) sample.