Encapsulating iron oxide@carbon in carbon nanofibers as stable electric conductive network for lithium-ion batteries
Encapsulating iron oxide@carbon in carbon nanofibers as stable electric conductive network for lithium-ion batteries
复制标题
将氧化铁@碳封装在碳纳米纤维中作为锂离子电池的稳定导电网络
DOI：
10.1016/j.electacta.2017.06.078
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发表时间：
2017
影响因子：
6.6
通讯作者：
Zhou Dongshan
中科院分区：
文献类型：
--
作者：
Xu Xiaoqian;Wan Yuanxin;Liu Jingwen;Chen Yaojun;Li Linling;Wang Xiaoliang;Xue Gi;Zhou Dongshan
为了满足混合动力汽车（HEV）或插电式混合动力汽车（PHEV）的快速充电要求，迫切需要锂离子电池（LIB）具有更好的倍率性能。在我们的工作中，开发了一种具有优异倍率性能的新型阳极。在该阳极中，涂覆有碳的纳米多孔氧化铁纳米颗粒（称为Fe2O3@C NP）均匀分布在碳纳米纤维（CNF）中，其可以称为Fe2O3@C CNF。CNF沿沿着约束纳米多孔Fe2O3@C NPs，并且纤维交联，建立三维（3D）稳定的导电网络。暴露在CNF表面的纳米多孔Fe2O3@C NPs为电极反应提供了更多的活性位点。Fe2O3纳米颗粒周围的薄碳壳提供了额外的保护，并改善了纳米纤维之间的导电连接，导致连接所有Fe2O3@C纳米颗粒的整体导电网络。Fe2O3@CNFs结构在高电流密度下表现出良好的容量保持率和优异的倍率容量。
To meet the requirements for the quick charge for the hybrid electric vehicles (HEVs) or plug-in hybrid electric vehicles (PHEVs), better rate capability is urgently needed for the lithium ion batteries (LIBs). Here in our work, a new anode with excellent rate capability is developed. In this anode, nanoporous iron oxide nanoparticles coated with carbon (designated as Fe2O3@C NPs) are homogeneous distributed in carbon nanofibers (CNFs), which can be designated as Fe2O3@C CNFs. The CNF constrains the nanoporous Fe2O3@C NPs along the longitudinal direction and the fibers are cross-linked, establishing a three dimensional (3D) stable electric conductive network. The nanoporous Fe2O3@C NPs exposed on the surface of CNFs provide more active sites for electrode reactions. The thin carbon shell around the Fe2O3NPs gives the additional protection and improves the conductive connection between the nanofibers, leading to an integral conductive network which links all the Fe2O3@C NPs. The Fe2O3@C CNFs structure exhibits good capacity retention and excellent rate capacity at high current density.