کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6471528 | 1424122 | 2017 | 13 صفحه PDF | دانلود رایگان |
In this work, Li2SiO3, a layer-structured fast Li+-ion conductor with three-dimensional Li+ paths, has been firstly introduced into LiNi0.5Mn1.5O4 to form novel cathode composites of (1-x)LiNi0.5Mn1.5O4·xLi2SiO3 via a citric acid-assisted sol-gel method. The effects of Li2SiO3 on the phase structure, morphology and electrochemical performance of the materials were investigated. As x increases, the structure and electrochemical properties of the materials are tailored. The cathode material with x = 0.10 delivers ultrahigh initial discharge capacity â¼150.3 mAh gâ1, which is 24.4% larger than that of the pristine LiNi0.5Mn1.5O4 (120.8 mAh gâ1). The Li2SiO3-composited LiNi0.5Mn1.5O4 materials present an enhanced cycling stability, better rate performance and lower charge transfer resistance. These excellent electrochemical properties indicate that the compositing of fast Li+-ion conductor Li2SiO3 is an effective method to enhance the electrochemical performance of LiNi0.5Mn1.5O4-based cathode materials.
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Journal: Electrochimica Acta - Volume 235, 1 May 2017, Pages 19-31