کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6613480 | 459600 | 2014 | 31 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Molten salt of lithium bis(fluorosulfonyl)imide (LiFSI)-potassium bis(fluorosulfonyl)imide (KFSI) as electrolyte for the natural graphite/LiFePO4 lithium-ion cell
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
The binary eutectic mixture of lithium bis(fluorosulfonyl)imide (LiFSI) and potassium bis(fluorosulfonyl)imide (KFSI) with a molar ratio of xLiFSI: xKFSI = 0.41: 0.59 has been investigated as molten salt electrolyte for natural graphite/LiFePO4 lithium-ion cells at 80 °C. The electrochemical performances of the Li/natural graphite, Li/LiFePO4, and natural graphite/LiFePO4 cells using this molten salt electrolyte have been evaluated, in terms of cycling performances and electrochemical impedance spectra (EIS) at 80 °C. Both the Li/natural graphite and Li/LiFePO4 cells show good cycling performances. The initial specific capacities after conditioning for the natural graphite and LiFePO4 electrodes are 353 and 150 mAh gâ1, respectively, and the corresponding capacity retention rates are 98% and 97%, respectively, after 100 cycles at 80 °C, except for a large irreversible capacity (162 mAh gâ1) observed for the natural graphite at the first cycle for forming solid electrolyte interface (SEI) film. The natural graphite/LiFePO4 lithium-ion cell using this molten salt electrolyte shows a low capacity in the range of 71-86 mAh gâ1, due to the large irreversible capacity (71 mAh gâ1) at the first cycle, but it shows a good cycleability after the first cycle, and provides a specific capacity of 71 mAh gâ1 after 100 cycles at 80 °C. The variations of cycling performances of these cells can be well correlated with their impedance evolution with cycling.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 135, 20 July 2014, Pages 217-223
Journal: Electrochimica Acta - Volume 135, 20 July 2014, Pages 217-223
نویسندگان
Fei Xu, Chengyong Liu, Wenfang Feng, Jin Nie, Hong Li, Xuejie Huang, Zhibin Zhou,