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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Facile synthesis and high lithium storage properties of mesoporous polypyrrole coated CoFe2O4 nanofibers
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Facile synthesis and high lithium storage properties of mesoporous polypyrrole coated CoFe2O4 nanofibers

机译：中孔聚吡咯涂层COFE2O4纳米纤维的容易合成与高锂储存性能

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摘要

The CoFe2O4 has been recognized as promising anode materials for lithium ions storage because of its merits of high theoretical capacity, low price and environmental friendliness. However, conductivity and structure stability are highly concerned as anode materials in lithium ion batteries (LIBs) applications. Herein, a mesoporous polypyrrole (PPy) coated CoFe2O4 nanofibers were successfully synthesized via combined electrospinning technique and polymerization method. After the covering of polypyrrole, both conductivity and structural stability were improved. Featuring desired specific surface area (SSA), pore distribution and unique nanofiber structure, the as prepared CoFe2O4/PPy showed superior electrochemical performance as anode in LIBs. Briefly, a high reversible capacity of 1246 mAh g(-1) after 150 cycles is retained with a coulombic efficiency (CE) of similar to 100%, which is much higher than that of bare CoFe2O4 nanofibers (693 mAh g(-1)), for the prepared CoFe2O4/PPy composite nanofibers. The specific capacity of 1309 mAh g(-1) is recovered when the current density is reduced back to 0.05 A g(-1) after cycling at different current densities ranging from low to high (0.05-2 A g(-1)) for many cycles. The propped route offers another perspective to improve the electrochemical performance of anode material for LIBs. (C) 2020 Elsevier B.V. All rights reserved.
机译：CoFe2O4具有理论容量大、价格低、环境友好等优点，被认为是一种很有前途的锂离子储能阳极材料。然而，作为锂离子电池（LIB）应用中的阳极材料，导电性和结构稳定性受到高度关注。在此，通过静电纺丝技术和聚合方法成功地合成了介孔聚吡咯（PPy）包覆CoFe2O4纳米纤维。聚吡咯包覆后，导电性和结构稳定性均得到改善。制备的CoFe2O4/PPy具有理想的比表面积（SSA）、孔分布和独特的纳米纤维结构，在LIBs中作为阳极表现出优异的电化学性能。简而言之，对于制备的CoFe2O4/PPy复合纳米纤维，150次循环后的高可逆容量为1246 mAh g（-1），库仑效率（CE）接近100%，远高于裸CoFe2O4纳米纤维（693 mAh g（-1））。在从低到高（0.05-2 A g（-1））的不同电流密度下进行多次循环后，当电流密度降至0.05 A g（-1）时，1309 mAh g（-1）的比容量恢复。支撑路径为改善锂离子电池阳极材料的电化学性能提供了另一个前景。（C） 2020爱思唯尔B.V.版权所有。

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