کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10225194 | 1701161 | 2018 | 26 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of Zr dopant on microstructural and electrochemical properties of LiCoO2 thin film cathodes by RF sputtering
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
LiCoO2 thin film cathodes have been well established in Li-ion rechargeable batteries, however, its useful capacity hardly exceeds 50% of the theoretical value. Irreversible structural changes will occur upon exchange of Li ions i.e. >0.5 per unit formula limit, during intercalation/deintercalation reactions. Reportedly, lattice doping phenomenon has noticed an improvement in cyclability of LiCoO2. In this work, the influence of Zr doping on microstructural and electrochemical properties of RF magnetron sputtered LiCoO2 thin film cathodes have been presented. A series of LiZrxCo1âxO2 thin films have been deposited on Au/Ti/SiO2/Si (100) substrates using a Zr-LiCoO2 mosaic target. All the films were deposited at optimized processing conditions. XRD and Raman spectroscopy measurements confirmed the hexagonal layered structure with R3¯m symmetry for Zr doped LiCoO2 film cathodes. The AFM reveals the estimated average grain size is around 50â¯nm. The cyclic voltammetry studies for these cathodes exhibit narrow potential peak separation of 24â¯mV and resulting highest diffusion coefficient (D¯Li) of about 1.8â¯Ãâ¯10â11â¯cm2â¯sâ1, respectively. These films exhibited a highest initial discharge capacity of 64.4â¯Î¼Aâ¯hâ¯cmâ2â¯Î¼mâ1 with a capacity retention of 98.5% even after 25â¯cycles. In non-aqueous region, the cell exhibited an initial discharge capacity of about 65â¯Î¼Aâ¯hâ¯cmâ2â¯Î¼mâ1 with good cycling stability even after 80â¯cycles, and is observed to be the more promising cathode candidate than the pristine LiCoO2 films.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 828, 1 November 2018, Pages 71-79
Journal: Journal of Electroanalytical Chemistry - Volume 828, 1 November 2018, Pages 71-79
نویسندگان
K. Sivajee Ganesh, B. Purusottam reddy, P. Jeevan Kumar, O.M. Hussain,