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Studi Kinetika Non-Ishotermal Pada Sintesis Katoda Lifepo4 Dengan Penambahan Few Layers Graphene (FLG) Menggunakan Metode Sol-Gel

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LiFePO4 has been considered as a promising cathode material for Li-ion
batteries due to its high specific capacity, long cycle stability, low toxicity, and
abundant raw material (earth core consists of 80% Fe). However, the low intrinsic
conductivity (10-9 S/cm) and lithium-ion diffusion (10-4−10-9) decrease their
electrochemical properties and hindering their further commercial application.
Recently, it has been reported that the properties (structure and morphology) of
LiFePO4 have a significant influence on their electrochemical capabilities, then
understanding the reaction kinetics of the LiFePO4 synthesis becomes fundamental
in designing the properties (structure and morphology) of LiFePO4 and knowing
the optimum synthesis conditions. Furthermore, the addition of conductive material
has also been reported to overcome problems related to the ionic and electronic
conductivity of the LiFePO4 cathode.
In this study, LiFePO4 was synthesized using the sol-gel method. This
method has been reported to provide homogeneous mixing at the atomic or
molecular level, good stoichiometric control, low synthesis temperature, short
heating time, and uniform particle size. The reaction kinetics of LiFePO4 synthesis
was studied using thermogravimetry-differential scanning calorimetry (TGA–DSC)
at heating rates of 5, 10, 15, and 20 K/min. The kinetic parameters were determined
using the Ozawa–Flynn–Wall (OFW), Kissinger, and Kissinger–Akahira–Sunose
(KAS) methods, while the reaction mechanism was evaluated using the Coats–
Redfern method. This research showed that LiFePO4 synthesized using the sol-gel
method has average activation energy and frequency factor of 101.971 kJ/mol and
2.358 × 107 s-1, respectively, with the reaction mechanism model following threedimensional
diffusion (Zhuralev Equation, Lesokhin, Tempalmen, D5). The
optimum temperature for the synthesis of LiFePO4 was 700℃. The field emission
scanning electron microscopy interlinked with energy dispersive X-Ray
(FESEM+EDX), transmission electron microscopy (TEM), X-ray diffraction
(XRD), Raman Spectroscopy, Fourier transform infrared (FTIR),
thermogravimetric analysis (TGA), and Braunauer-Emmett-Teller (BET) results
showed that graphene addition to LiFePO4 increased crystallinity, phase purity,
specific surface area (43.384 m2/g), and carbon content (38.12%), as well as
reducing the particle size of LiFePO4 (75.598 nm), which leads to an improvement
in the electrochemical properties and ion/electron transport in the LiFePO4
cathode.
Keywords : LiFePO4, kinetics, graphene, sol-gel, three-dimensional diffusion

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

10 25. 221 (0003)

Penerbit

Pekanbaru : Universitas Riau – Pascasarjana – Tesis Teknik Kimia., 2021

Deskripsi Fisik

xvii, 231 hlm.: ill.: 29 cm

Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

10 25. 221 (0003)

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

TEKNIK KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

FATAH

Versi lain/terkait

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