Sintesis Komposit LiFePO4/C Berbasis Batu Alam Tanah Laut Menggunakan Metode Sol Gel - Synthesis Of LiFePO4/C Composites Based On Natural Stone Of Tanah Laut Using Sol Gel Method

Angela, Riyan (2016) Sintesis Komposit LiFePO4/C Berbasis Batu Alam Tanah Laut Menggunakan Metode Sol Gel - Synthesis Of LiFePO4/C Composites Based On Natural Stone Of Tanah Laut Using Sol Gel Method. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sintesis LiFePO4/C telah dilakukan dengan metode sol gel. Prekusor dibuat dari bahan dasar batu alam Tanah Laut Kalimantan Selatan, serbuk Li2CO3, dan NH4H2PO4 dengan pelarut HCl 37 % dan akuades. Asam sitrat ditambahkan sebagai sumber karbon pada material katoda LiFePO4/C. Rasio konsentrasi mol Li:Fe:P yang digunakan adalah sebesar 1:1:2 dengan variasai penambahan asam sitrat 1 ; 1,5; 2; 2,5; dan 3 gr diikiuti pengeringan selama 5 jam pada temperatur 100oC. Serbuk hasil pengeringan diuji DSC-TGA, selanjutnya dikalsinasi dengan variasi temperatur 600 °C dan 700 °C di lingkungan argon selama 10 jam. Serbuk hasil kalsinasi dikarakterisasi menggunakan X-ray diffractometry (XRD), scanning electron microscopy – energy dispersive x-ray (SEM-EDX) dan LCR meter. Sampel terdiri dari fasa dominan yaitu LiFePO4 (LFP) dan fasa sekunder berupa LIFeP2O7 dan Fe2O3. Hasil analisis menunjukkan bahwa penambahan asam sitrat mempengaruhi konduktivitas dari komposit. Berdasarkan metode rietveld untuk fraksi berat relatif komposisi fasa, pembentukan LFP yang paling optimal adalah pada penambahan asam sitrat 2.5 gr, temperatur 600 °C selama 10 jam dengan fraksi berat 94,7 %. Sampel LFP/C menghasilkan konduktivitas tertinggi 4,5× 10-3 S/cm, dimana enam kali lebih tinggi dari konduktivitas LFP ======================================================================================================================== Synthesis of LiFePO4/C composites has been carried out using a sol gel method. The Fe precursor was made from a natural stone of Tanah Laut, South Kalimantan, while the other raw materials were commercial Li2CO3 powder, and NH4H2PO4 powder with HCl and water as solvents. Citric Acid was used as the carbon source in the synthesis. This study used mol ratio of 1:1:2 for Li:Fe:P with variation of added citic acid was 1; 1.5; 2; 2.5 and 3 gr. The solutions were dried 5 hours in air at 100 °C. The dried powders were characterized using DSC-TGA, and then calcined under argon environtment for 10 hours. The calcined powders were characterized by X-ray diffractometry (XRD), scanning electron microscopy – energy dispersive x-ray (SEM-EDX) and LCR meter. It was found that the samples contained LiFePO4 as the dominant phase and LIFeP2O7 and Fe2O3 as secondary phase. The analysis showed that the addition of citic acid influenced the electronic conductivity of the composites. A maximum Rietveld relative weight fraction, up to 94.7% was achieved in the synthesis at temperature 600 °C, for 10 hours. The LFP/C sample exhibited electronic conductivity of 4.56×10-3 Scm-1 which was six times of that the pure LFP.

Item Type: Thesis (Masters)
Additional Information: RTFi 548.85 Ang s
Uncontrolled Keywords: Komposit LiFePO4/C, metode sol gel, batu alam, konduktivitas listrik, LiFePO4/C composites, sol gel method, natural stone, electronic conductivity
Subjects: Q Science > QC Physics > QC610.3 Electric conductivity
Divisions: Faculty of Mathematics and Science > Physics
Depositing User: ansi aflacha
Date Deposited: 19 Dec 2019 08:45
Last Modified: 19 Dec 2019 08:45
URI: https://repository.its.ac.id/id/eprint/72448

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