کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7735825 | 1497962 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Li4Ti5O12 coated graphite anodes with piperidinium-based hybrid electrolytes for lithium ion batteries
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
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![عکس صفحه اول مقاله: Li4Ti5O12 coated graphite anodes with piperidinium-based hybrid electrolytes for lithium ion batteries Li4Ti5O12 coated graphite anodes with piperidinium-based hybrid electrolytes for lithium ion batteries](/preview/png/7735825.png)
چکیده انگلیسی
The electrochemical performances of the 2 wt% and 5 wt% Li4Ti5O12 coated carbon microbeads (CMB) composites in the piperidinium-based hybrid electrolytes are investigated. Particularly, the interfacial properties and crystal structures of cycled LTO-CMB electrodes are explored by means of scanning electron microscopy, electrochemical impedance and X-ray diffraction. It is found that, the Li4Ti5O12 coating can help to reduce the interfacial reactions and decrease the initial irreversible capacity. At 0.05 C, the initial coulombic efficiency are improved from 62.7% of pristine CMB to 63.5% of 2% LTO-CMB and 72.5% of 5% LTO-CMB respectively. However, due to its incomplete surface coating, the discharge capacities of 2% LTO-CMB vary with cycle number as an undulate shape, and show a large capacity loss. By contrast, the cycled 5% LTO-CMB covered by a stable and dense granular surface film, shows better rate capability and cycle life. The discharge capacity can always maintain about 290 mAh gâ1 during the first 22 cycles at 0.1 C. Even at 1 C or 2 C, the reversible capacity is about 50--100 mAh gâ1 higher than the unmodified CMB.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 270, 15 December 2014, Pages 304-311
Journal: Journal of Power Sources - Volume 270, 15 December 2014, Pages 304-311
نویسندگان
Kun Gao, Shu-Dan Li,