Perubahan Fasa Dalam Pembuatan Serbuk LiFePO4 Dengan Tiga Tahap Perlakuan Panas Tanpa Pelapisan Karbon [Phase Change In LiFePO4 Powder Making With Three Step Heat Treatment Non-Carbon Coating]
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Abstract
LiFePO4 is one of the cathode active materials for lithium-ion batteries. This study aimed to synthesize LiFePO4 active material powder without carbon coating using three-step heat treatment i.e. first calcination with 700 °C temperature for about 2 h, second calcination with 800 °C temperature for about 8 h, and sintering using activated carbon pellets with 800 °C for about 4 h. The raw materials are LiOH.H2O, Fe2O3, and H3PO4. The first calcination produced precursor which consists of Li3PO4 and Fe2O3, with Fe2O3 as a dominant phase. The second calcination produced precursor which consists of Li3Fe2(PO4)3 and Fe2O3, with Li3Fe2(PO4)3 as a dominant phase. The sintering process produced LiFePO4 as a final powder product. There is Li3PO4 – Li3Fe2(PO4)3 – LiFePO4 phase transformation during three-step heat treatment. The final product i.e. LiFePO4 has a Pnma space group. It is indicated that LiFePO4 has an olivine structure. The olivine structure is a structure that uses for lithium-ion cathode material. Activated carbon pellets did not react during final sintering process, so that it did not make a carbon coating on LiFePO4 morphology. According to the results, we can conclude that this method can be used for synthesizing lab-scale LiFePO4without carbon coating.
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