کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1288690 973272 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
LiCr0.2Ni0.4Mn1.4O4 spinels exhibiting huge rate capability at 25 and 55 °C: Analysis of the effect of the particle size
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
LiCr0.2Ni0.4Mn1.4O4 spinels exhibiting huge rate capability at 25 and 55 °C: Analysis of the effect of the particle size
چکیده انگلیسی

The comparison of the rate capability of LiCr0.2Ni0.4Mn1.4O4 spinels synthesized by the sucrose aided combustion method at 900, 950 and 1000 °C is presented. XRD and TEM studies show that the spinel cubic structure remains unchanged on heating but the particle size is notably modified. Indeed, it increases from 695 nm at 900 °C to 1465 nm at 1000 °C. The electrochemical properties have been evaluated by galvanostatic cycling at 25 and 55 °C between 1 C and 60 C discharge rates. At both temperatures, all samples exhibit high working voltage (∼4.7 V), elevated capacity (∼140 mAh g−1) and high cyclability (capacity retention ∼99% after 50 cycles even at 55 °C). The samples also have huge rate capability. They retain more than 70% of their maximum capacity at the very fast rate of 60 C. The effect of the particle size on the rate capability at 25 and at 55 °C has been investigated. It was demonstrated that LiCr0.2Ni0.4Mn1.4O4 annealed at 900 °C, with the lowest particle size, has the best electrochemical performances. In fact, among the LiNi0.5Mn1.5O4-based cathodes, SAC900 exhibits the highest rate capability ever published. This spinel, able to deliver 31,000 W kg−1 at 25 °C and 27,500 W kg−1 at 55 °C is a really promising cathode for high-power Li-ion battery.


► Synthesized LiCr0.2Ni0.4Mn1.4O4 spinels exhibit the highest rate capability among LiNi0.5Mn1.5O4-based cathodes.
► The rate capability is enhanced at 25 and 55 °C on decreasing the particle size.
► LiCr0.2Ni0.4Mn1.4O4 heated at 900 °C delivers a high power of 31,000 W kg−1.
► LiCr0.2Ni0.4Mn1.4O4 at 900 °C is a really promising cathode for commercial Li-ion batteries.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 196, Issue 23, 1 December 2011, Pages 10222–10227
نویسندگان
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