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首页> 外文期刊>RSC Advances >Improved electrochemical performance of onion-like carbon coated magnetite nanocapsules as electromagnetic absorptive anode materials for lithium-ion batteries
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Improved electrochemical performance of onion-like carbon coated magnetite nanocapsules as electromagnetic absorptive anode materials for lithium-ion batteries

机译：改善了洋葱状碳包覆磁铁矿纳米胶囊作为锂离子电池电磁吸收阳极材料的电化学性能

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摘要

The synthesis of magnetite (Fe3O4)@C nanocapsules with Fe3O4 nanoparticles as the core and onion-like carbon as the shell has been reported. The electromagnetic (EM) characteristics and electrochemical performance are studied. The onion-like carbon shell improves dielectric loss and EM matching degree, leading to enhanced EM properties. The optimal reflection loss (RL) value of the Fe3O4@C-paraffin composite is -45.9 dB at 16.6 GHz at a thickness of 2.4 mm and the absorption bandwidth of 7.2 GHz (RL exceeding -10 dB) covers 9.8-17.0 GHz at 3.0 mm. The EM absorption mechanism may be explained by the combination of the EM loss model and the quarter-wavelength cancellation condition. The onion-like defective carbon shell not only can accommodate the volume change of Fe3O4 nanoparticles but also can prevent the formation of solid electrolyte interface films on the surface of nanoparticles, resulting in the remarkable electrochemical performance for lithium ion batteries (LIBs). The Fe3O4@C nanocapsules display an attractive cycling performance up to 300 cycles (918 mA h g(-1) retained at 0.1 A g(-1)) and a high initial coulomb efficiency of 85.6%. A capacity of 934 mA h g(-1) is recoverable after the charge-discharge process at high rates. The present work presents Fe3O4@C nanocapsules as a new kind of EM absorptive anode material for LIBs.
机译：已经报道了以Fe 3 O 4纳米粒子为核，洋葱状碳为壳的磁铁矿（Fe 3 O 4）@C纳米胶囊的合成。研究了电磁（EM）特性和电化学性能。洋葱状的碳壳改善了介电损耗和EM匹配度，从而增强了EM性能。 Fe3O4 @ C-石蜡复合材料的最佳反射损耗（RL）值在2.4 mm厚度下在16.6 GHz下为-45.9 dB，而7.2 GHz（RL超过-10 dB）的吸收带宽在3.0下覆盖9.8-17.0 GHz毫米EM吸收机制可以通过EM损耗模型和四分之一波长消除条件的组合来解释。洋葱状的有缺陷的碳壳不仅可以适应Fe3O4纳米颗粒的体积变化，而且可以防止在纳米颗粒表面形成固体电解质界面膜，从而为锂离子电池（LIB）带来了卓越的电化学性能。 Fe3O4 @ C纳米胶囊在300个循环（918 mA h g（-1）保持在0.1 A g（-1）时）上表现出有吸引力的循环性能，并且初始库仑效率高达85.6％。在高速率的充放电过程之后，可以恢复到934 mA h g（-1）的容量。目前的工作提出了Fe3O4 @ C纳米胶囊作为一种新型的用于LIBs的EM吸收阳极材料。

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