کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6470662 1424112 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pristine Surface Investigation of Li1.2Mn0.54Ni0.13Co0.13O2 towards Improving Capacity and Rate-capability for Lithium-ion Batteries
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Pristine Surface Investigation of Li1.2Mn0.54Ni0.13Co0.13O2 towards Improving Capacity and Rate-capability for Lithium-ion Batteries
چکیده انگلیسی

Understanding the nature of pristine surface associated with lithium- and manganese-rich cathodes is the key to optimizing the electrochemical performance for Li-ion batteries. In this work, Li1.2Mn0.54Ni0.13Co0.13O2 cathodes with phase and element homogeneity were synthesized by a facile hydroxide co-precipitation strategy. Two routes of adjusting lithium content and post-treatment were applied to tune the surface structure of pristine samples. It is found that the sample with 5 wt%-excess lithium and after post-treatment exhibits excellent capacity and rate-capability: delivering initial discharge capacities of 254 mAh/g at current densities of 100 mA/g, 200 mAh/g at 1000 mA/g, and 142 mAh/g at 4000 mA/g. The capacity of this cathode at 4 A/g thereby remains 55 percentage of the discharge capacity at 100 mA/g. The reason for the better performance of this cathode was attributed to the removal of surficial amorphous Li2CO3 layer, as revealed by the detailed analyses of transition electron micrograph and X-ray photoelectron spectrum. The amorphous layer was demonstrated by electrochemical impedance to show a block effect on increasing the interfacial resistance. This work may shed light on the importance of pristine surface and provide a hint for searching cathodes of high-energy Li-ions batteries with excellent capacity and rate properties.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 245, 10 August 2017, Pages 118-127
نویسندگان
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