کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7989980 | 1516125 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Graphene-templated growth of vertical MnO nanosheets with open macroporous architectures as anode materials for fast lithium storage
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
Transition metal oxides (TMOs) have emerged as one of the promising and intriguing materials for next-generation lithium-ion battery (LIB) anodes with high capacities. However, the poor power capability and inferior cyclic stability of TMO anodes, caused by the low electrical conductivity and large volume changes, cannot meet the rapidly growing demands of commercial applications. Developing TMO-anode materials with high-performance has become an important research focus. In this study, vertical MnO nanosheets using graphene as a template (M-GS) with 3D open macroporous architectures are prepared by a low-temperature hydrothermal method combined with a heat treatment. As anodes for LIBs, M-GS electrodes display the high reversible capacity (819.8â¯mAh gâ1 at the current density of 250â¯mAâ¯gâ1) and long cyclic performance (606.2â¯mAh gâ1 with 127% capacity retention after 200 cycles at 1500â¯mAâ¯gâ1). Furthermore, obvious rising reversible capacities are acquired with the increasing C-rates, and the maximum capacity is at 2500â¯mAâ¯gâ1, implying the outstanding rate capability. These excellent properties benefit from the coexistence of vertical MnO nanosheets and graphene and their synergetic effects. The tight attaching of MnO nanosheets on graphene remarkably improves the electrical conductivity and structural stability for impressive cyclability, and the open macroporous architectures alleviate the volume changes and shorten diffusion paths of ionic/electronic transport for fast lithium storage.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 769, 15 November 2018, Pages 10-17
Journal: Journal of Alloys and Compounds - Volume 769, 15 November 2018, Pages 10-17
نویسندگان
Fanyan Zeng, Xiaoxue Zhang, Yang Pan, Meng Xu, Leyan Yang, Yaohui Qu, Manman Guo, Cailei Yuan,