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好喜歡學術(shù)金蟲 (正式寫手)
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[求助]
A Self-Standing and Flexible Electrode of Yolk–Shell CoS2 Spheres Encapsula
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求助論文一篇��！A Self-Standing and Flexible Electrode of Yolk–Shell CoS 2 Spheres Encapsulated with Nitrogen-Doped Graphene for High-Performance Lithium-Ion Batteries A Self-Standing and Flexible Electrode of Yolk–Shell CoS 2 Spheres Encapsulated with Nitrogen-Doped Graphene for High-Performance Lithium-Ion Batteries 來自Wiley收藏引用 作者W Qiu，J Jiao，J Xia，H Zhong，Prof.&#x ;Dr. Liuping Chen 摘要Flexible lithium-ion batteries (LIBs) have recently attracted increasing attention with the fast development of bendable electronic systems. Herein, a facile and template-free solvothermal method is presented for the fabrication of hybrid yolk-shell CoS2 and nitrogen-doped graphene (NG) sheets. The yolk-shell architecture of CoS2 encapsulated with NG coating is designed for the dual protection of CoS2 to address the structural and interfacial stability concerns facing the CoS2 anode. The as-prepared composite can be assembled into a film, which can be used as a binder-free and flexible electrode for LIBs that does not require any carbon black conducting additives or current collectors. When evaluating lithium-storage properties, such a flexible electrode exhibits a high specific capacity of 99261mAh65g(-1) in the first reversible discharge capacity at a current rate of 10061mA65g(-1) and high reversible capacity of 88261mAh65g(-1) after 15061cycles with excellent capacity retention of 89.9165%. Furthermore, a reversible capacity as high as 65561mAh65g(-1) is still achieved after 5061cycles even at a high rate of 561C due to the yolk-shell structure and NG coating, which not only provide short Li-ion and electron pathways, but also accommodate large volume variation.更多 出版源Chemistry (Weinheim an der Bergstrasse, Germany), 2015, 21(11):4359–4367 關(guān)鍵詞cobalt / energy storage / graphene / lithium-ion batteries / yolk-shell structures |
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