کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
179977 | 459367 | 2011 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Extended lithium titanate cycling potential window with near zero capacity loss Extended lithium titanate cycling potential window with near zero capacity loss](/preview/png/179977.png)
Lithium titanate (Li4Ti5O12, or LTO) is a promising anode for lithium-ion batteries due to its rate capability and cycling stability. However, its structural instability and solid electrolyte interphase formation at low potential limits its application within a high cut-off voltage above 1 V, which significantly sacrifices the cell voltage and energy density. This work demonstrates how a few atomic layers of Al2O3 deposited on LTO electrode improved its cycling performance (no capacity degradation after 100 cycles) and provided a higher Coulombic efficiency compared with the standard uncoated LTO electrode when they are cycled at low potential down to 1 mV. It has been found that the ultrathin oxide layers served as a passivation film not only stabilized the LTO structure but also surprisingly suppressed some undesirable chemical reactions.
► Ultrathin oxide coating was conformally deposited on Lithium Titanate electrode, as proved by HRTEM images combined with EDX analysis.
► A few nanometer Al2O3 enabled the lithium titanate to be cycled at deep potential down to 1 mV vs. Li/Li+ with significantly improved cycling stability and Columbic efficiency with almost no capacity degradation after 100 cycles.
► It has been found oxide coating stabilized SEI and suppressed side reaction.
Journal: Electrochemistry Communications - Volume 13, Issue 8, August 2011, Pages 796–799