کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7733697 1497953 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Polyethylene glycol-assisted synthesis of hierarchically porous layered lithium-rich oxide as cathode of lithium ion battery
ترجمه فارسی عنوان
سنتز پلی اتیلن گلیکول از اکسید غنی از لیتیوم لایه متخلخل به صورت متخلخل به عنوان کاتد باتری یون لیتیوم
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی
A hierarchically porous layered lithium-rich oxide, 0.5Li2MnO3·0.5LiMn1/3Ni1/3Co1/3O2, is synthesized by co-precipitation of metal oxalates with an assistance of a moderate polyethylene glycol (PEG2000). The morphology and crystal structure of the product are characterized by scanning electron microscope, transmission electron microscopy and X-ray diffraction, and its performance as cathode of lithium ion battery is evaluated with charge/discharge tests. It is found that the as-synthesized oxide exhibits excellent rate capability and cyclic stability: delivering an initial discharge capacity of 262 mAh g−1 at 0.1C (1C = 250 mA g−1) and 135 mAh g−1 at 4C, and possessing a capacity retention of 83% after 200 cycles at 4C. These performances can be attributed to the unique structure of the as-synthesized oxide: uniform secondary microspheres of about 10 μm, which is composed of uniform primary microparticles of about 2 μm, and hierarchically porous structure with pores distributed among primary and secondary particles. The hierarchically porous structure provides large reaction sites for lithium ion insertion/extraction and large space to buffer the volume change during cycling, leading to the excellent rate capability and cyclic stability of the as-synthesized oxide.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 279, 1 April 2015, Pages 197-204
نویسندگان
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