کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
11005948 1498218 2018 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of carbon coated Li2MnO3 cathode material with enhanced rate capability for lithium-ion batteries
ترجمه فارسی عنوان
سنتز مواد کاتدی پوشش داده شده با کربن پوشش داده شده با قابلیت افزایش میزان باتری های لیتیوم یون
کلمات کلیدی
ظرفیت تخلیه بالا، هدایت، توانایی امتیاز، باتری های یون لیتیوم،
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
Layered Li2MnO3 mixed with sucrose is heat-treated at low temperature under air atmosphere. A uniform carbon layer is found to be coated on Li2MnO3 active material according to the analysis of scanning electron microscopy and transmission electron microscopy. The thin carbon coating is in favor of good electrical contact between the cathode active particles as well as prevents the direct contact between the active material and electrolyte. Based on X-ray diffraction and X-ray photoelectron spectroscopy analyses, the crystal structure of Li2MnO3 is not degraded and some Mn4+ on the surface is reduced to Mn3+ during the carbon coating process in air. The galvanostatic charge-discharge results show the carbon coated Li2MnO3 exhibits greatly improved discharge capacity and rate capability. The carbon modified Li2MnO3 treated for 40 min delivers initial discharge capacity of 280.5 mAh g−1 at 10 mA g−1 and 117.5 mAh g−1 at 400 mA g−1 while the pristine sample only delivers 229.1 and 51.8 mAh g−1 at the same current densities. The significantly improved high rate performance demonstrates this synthesis route is a reliable approach for conductive carbon coating on cathode materials used in lithium ion batteries.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 325, 1 November 2018, Pages 170-175
نویسندگان
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