Three-dimensional carbon-coated ZnFe₂O₄ nanospheres/nitrogen-doped graphene aerogels as anode for lithium-ion batteries

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• 作者：Libing Yao ; Huihui Deng ; Qiu-An Huang ; Qingmei Su ; Gaohui Du ; ^{gaohuidu@zjnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Composite ; Nanostructure ; Metal oxide ; Anode ; Graphene
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：1022-1028
• 全文大小：1097 K

文摘

Three-dimensional (3D) porous carbon-coated ZnFe₂O₄ nanospheres/N-doped graphene aerogels (ZnFe₂O₄@C/N-G) have been synthesized via a facile hydrothermal method. The obtained ZnFe₂O₄@C hierarchical nanospheres with a size distribution of 150–210 nm are uniformly encapsulated within the graphene aerogels matrix. The ZnFe₂O₄@C/N-G composites as anode materials for Li-ion batteries demonstrate a high initial discharge capacity of ~1176 mA h g⁻¹ with an initial coulombic efficiency of ~71.1% at a rate of 100 mA g⁻¹. Moreover, a significantly enhanced reversible capacity of 952 mA h g⁻¹ is retained after 100 cycles. After being cycled at various rates for 100 cycles, the capacity can reincrease to 955 mA h g⁻¹ when the specific current returns back to 100 mA g⁻¹. The improved electrochemical performance is attributed to the unique architectures of the carbon layer (~2 to 4 nm) and 3D porous N-doped graphene aerogels.