СИНТЕЗ НАНОКРИСТАЛІВ LiFePO4 У СЕРЕДОВИЩІ ІОННОЇ РІДИНИ З ВИКОРИСТАННЯМ НВЧ-НАГРІВУ
The liquid-phase method of synthesis of lithium iron(II) phosphate (LiFePO4) in the medium of choline chloride and diethylene glycol under the action of microwave heating is proposed. With a power of microwave radiation of 920 and 1150 W, a nanocrystalline LiFePO4 without impurities was obtained. Ob...
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V.I.Vernadsky Institute of General and Inorganic Chemistry
2019
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oai:ojs2.1444248.nisspano.web.hosting-test.net:article-912019-11-13T12:04:02Z SYNTHESIS OF LiFePO4 NANOCRYSTALS IN THE ION-LIQUID MEDIUM USING MICROWAVE HEATING СИНТЕЗ НАНОКРИСТАЛЛОВ LiFePO4 В СРЕДЕ ИОННОЙ ЖИДКОСТИ С ИСПОЛЬЗОВАНИЕМ СВЧ-НАГРЕВА СИНТЕЗ НАНОКРИСТАЛІВ LiFePO4 У СЕРЕДОВИЩІ ІОННОЇ РІДИНИ З ВИКОРИСТАННЯМ НВЧ-НАГРІВУ Galaguz, Vadym Panov, Eduard Malovanyi, Sergiy lithium-ion batteries, LiFePO4/C, microwave synthesis, Raman spectroscopy. The liquid-phase method of synthesis of lithium iron(II) phosphate (LiFePO4) in the medium of choline chloride and diethylene glycol under the action of microwave heating is proposed. With a power of microwave radiation of 920 and 1150 W, a nanocrystalline LiFePO4 without impurities was obtained. Obtained samples of microwave processes contain amorphous phase and require long annealing resulting in nanocrystalline LiFePO4/C composites with small impurities Li3PO4, Li3Fe2(PO4)3, Fe2O3. For samples obtained in the choline chloride with diethylene glycol microwave heating characteristic is lamellar morphology – the same as for LiFePO4 obtained by thermal heating, but in the case of using microwave irradiation plates are smaller. This indicates that the reaction mechanism of LiFePO4 synthesis does not change in the microwave synthesis, but the reaction rate is significantly increased (up to 6 times faster than thermal synthesis). Using the Raman spectroscopy, the nature of the carbon coating on the crystal of LiFePO4 was studied. The Raman spectra of the LiFePO4/C composites obtained from an annealed powder with glucose and malic acid have pronounced D (~ 1340 cm-1) and G (~ 1600 cm-1) peaks, as well as two additional bands at ~ 1200 and ~ 1520 cm-1 obtained after the expansion of main peaks. The ratio of peak intensities of lines D and G (ID/IG) has a value of 1.06 for the material obtained after glucose carbonation and 1.01 for LiFePO4/C composites annealed with malic acid, which correlates with the results of other investigations of the carbon coating LiFePO4 (ID/IG ~ 1-3) That means the choice of an organic precursor does not affect the nature of the carbon coating (ID/IG ~ 1). Capacity of cathode material based on LiFePO4/C composites is ~ 130 mAh/g for a current of 0.1C. V.I.Vernadsky Institute of General and Inorganic Chemistry 2019-10-16 Article Article Physical chemistry Физическая xимия Фізична xімія application/pdf https://ucj.org.ua/index.php/journal/article/view/91 10.33609/0041-6045.85.10.2019.78-82 Ukrainian Chemistry Journal; Vol. 85 No. 10 (2019): Ukrainian Chemistry Journal; 78-82 Украинский химический журнал; Том 85 № 10 (2019): Украинский химический журнал; 78-82 Український хімічний журнал; Том 85 № 10 (2019): Український хімічний журнал; 78-82 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/91/59 |
| institution |
Ukrainian Chemistry Journal |
| baseUrl_str |
|
| datestamp_date |
2019-11-13T12:04:02Z |
| collection |
OJS |
| language |
English |
| topic_facet |
lithium-ion batteries LiFePO4/C microwave synthesis Raman spectroscopy. |
| format |
Article |
| author |
Galaguz, Vadym Panov, Eduard Malovanyi, Sergiy |
| spellingShingle |
Galaguz, Vadym Panov, Eduard Malovanyi, Sergiy СИНТЕЗ НАНОКРИСТАЛІВ LiFePO4 У СЕРЕДОВИЩІ ІОННОЇ РІДИНИ З ВИКОРИСТАННЯМ НВЧ-НАГРІВУ |
| author_facet |
Galaguz, Vadym Panov, Eduard Malovanyi, Sergiy |
| author_sort |
Galaguz, Vadym |
| title |
СИНТЕЗ НАНОКРИСТАЛІВ LiFePO4 У СЕРЕДОВИЩІ ІОННОЇ РІДИНИ З ВИКОРИСТАННЯМ НВЧ-НАГРІВУ |
| title_short |
СИНТЕЗ НАНОКРИСТАЛІВ LiFePO4 У СЕРЕДОВИЩІ ІОННОЇ РІДИНИ З ВИКОРИСТАННЯМ НВЧ-НАГРІВУ |
| title_full |
СИНТЕЗ НАНОКРИСТАЛІВ LiFePO4 У СЕРЕДОВИЩІ ІОННОЇ РІДИНИ З ВИКОРИСТАННЯМ НВЧ-НАГРІВУ |
| title_fullStr |
СИНТЕЗ НАНОКРИСТАЛІВ LiFePO4 У СЕРЕДОВИЩІ ІОННОЇ РІДИНИ З ВИКОРИСТАННЯМ НВЧ-НАГРІВУ |
| title_full_unstemmed |
СИНТЕЗ НАНОКРИСТАЛІВ LiFePO4 У СЕРЕДОВИЩІ ІОННОЇ РІДИНИ З ВИКОРИСТАННЯМ НВЧ-НАГРІВУ |
| title_sort |
синтез нанокристалів lifepo4 у середовищі іонної рідини з використанням нвч-нагріву |
| title_alt |
SYNTHESIS OF LiFePO4 NANOCRYSTALS IN THE ION-LIQUID MEDIUM USING MICROWAVE HEATING СИНТЕЗ НАНОКРИСТАЛЛОВ LiFePO4 В СРЕДЕ ИОННОЙ ЖИДКОСТИ С ИСПОЛЬЗОВАНИЕМ СВЧ-НАГРЕВА |
| description |
The liquid-phase method of synthesis of lithium iron(II) phosphate (LiFePO4) in the medium of choline chloride and diethylene glycol under the action of microwave heating is proposed. With a power of microwave radiation of 920 and 1150 W, a nanocrystalline LiFePO4 without impurities was obtained. Obtained samples of microwave processes contain amorphous phase and require long annealing resulting in nanocrystalline LiFePO4/C composites with small impurities Li3PO4, Li3Fe2(PO4)3, Fe2O3. For samples obtained in the choline chloride with diethylene glycol microwave heating characteristic is lamellar morphology – the same as for LiFePO4 obtained by thermal heating, but in the case of using microwave irradiation plates are smaller. This indicates that the reaction mechanism of LiFePO4 synthesis does not change in the microwave synthesis, but the reaction rate is significantly increased (up to 6 times faster than thermal synthesis). Using the Raman spectroscopy, the nature of the carbon coating on the crystal of LiFePO4 was studied. The Raman spectra of the LiFePO4/C composites obtained from an annealed powder with glucose and malic acid have pronounced D (~ 1340 cm-1) and G (~ 1600 cm-1) peaks, as well as two additional bands at ~ 1200 and ~ 1520 cm-1 obtained after the expansion of main peaks. The ratio of peak intensities of lines D and G (ID/IG) has a value of 1.06 for the material obtained after glucose carbonation and 1.01 for LiFePO4/C composites annealed with malic acid, which correlates with the results of other investigations of the carbon coating LiFePO4 (ID/IG ~ 1-3) That means the choice of an organic precursor does not affect the nature of the carbon coating (ID/IG ~ 1). Capacity of cathode material based on LiFePO4/C composites is ~ 130 mAh/g for a current of 0.1C. |
| publisher |
V.I.Vernadsky Institute of General and Inorganic Chemistry |
| publishDate |
2019 |
| url |
https://ucj.org.ua/index.php/journal/article/view/91 |
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| first_indexed |
2025-09-24T17:43:33Z |
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2025-09-24T17:43:33Z |
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