کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7732633 | 1497947 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrochemical effect of lithium tungsten oxide modification on LiCoO2 thin film electrode
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Electrochemical effect of lithium tungsten oxide modification on LiCoO2 thin film electrode Electrochemical effect of lithium tungsten oxide modification on LiCoO2 thin film electrode](/preview/png/7732633.png)
چکیده انگلیسی
We fabricated a lithium tungsten oxide (LWO)-modified LiCoO2 (LCO) thin film electrode by pulsed laser deposition and investigated the reason for its lower resistance as compared with a bare LCO electrode. X-ray diffraction revealed that the LWO layer has a randomly oriented Li2WO4 structure with tetragonal symmetry. Scanning electron microscopy and energy-dispersive X-ray spectroscopy (EDX) indicated that the LWO modification changes the LCO particle surface, and the electrochemical impedance spectroscopy demonstrated that the LWO modification on LCO decreases the lithium ion transfer resistance at the interface between the positive electrode and the liquid electrolyte and increases the frequency factor at the interface. X-ray photoemission spectroscopy, EDX, and electron energy loss spectroscopy (EELS) indicated the presence of phosphate on the surface of the unmodified LCO electrode after electrochemical tests, but EDX and EELS did not indicate the presence of phosphate in the LWO-modified LCO electrode. The absence of phosphates apparently alleviates the hindrance of Li+ ion diffusion and increases the frequency factor in LCO, resulting in lowered Li+ ion transfer resistance at the interface.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 285, 1 July 2015, Pages 559-567
Journal: Journal of Power Sources - Volume 285, 1 July 2015, Pages 559-567
نویسندگان
Tetsutaro Hayashi, Jiro Okada, Eiji Toda, Ryuichi Kuzuo, Yasutaka Matsuda, Naoaki Kuwata, Junichi Kawamura,