Yolk-Shell MnO@ZnMn₂O₄/N-C Nanorods Derived from α-MnO₂/ZIF-8 as Anode Materials for Lithium Ion Batteries

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• 作者：Ming Zhong ; Donghui Yang ; Chenchao Xie ; Zhang Zhang ; Zhen Zhou and Xian-He Bu
• 刊名：Small
• 出版年：2016
• 出版时间：October 26, 2016
• 年：2016
• 卷：12
• 期：40
• 页码：5564-5571
• 全文大小：1722K
• ISSN：1613-6829

文摘

Manganese oxides (MnO_x) are promising anode materials for lithium ion batteries, but they generally exhibit mediocre performances due to intrinsic low ionic conductivity, high polarization, and poor stability. Herein, yolk–shell nanorods comprising of nitrogen-doped carbon (N–C) coating on manganese monoxide (MnO) coupled with zinc manganate (ZnMn₂O₄) nanoparticles are manufactured via one-step carbonization of α-MnO₂/ZIF-8 precursors. When evaluated as anodes for lithium ion batteries, MnO@ZnMn₂O₄/N–C exhibits an reversible capacity of 803 mAh g⁻¹ at 50 mA g⁻¹ after 100 cycles, excellent cyclability with a capacity of 595 mAh g⁻¹ at 1000 mAg⁻¹ after 200 cycles, as well as better rate capability compared with those non-N–C shelled manganese oxides (MnO_x). The outstanding electrochemical performance is attributed to the unique yolk–shell nanorod structure, the coating effect of N–C and nanoscale size.