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
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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: | http://repository.its.ac.id/id/eprint/72448 |
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