Lu Lu, Li Sheng, Li Jun, Lan Lifang, Lu Yan, Xu Shuaijun, Huang Si, Pan Chunyang, Zhao Fenghua
School of Chemical Engineering and Light Industry, Guangdong University of Technology, No. 100 Waihuan xi Road, Guangzhou Higher Education Mega Center, Panyu District, Guangzhou, 510006, China.
Nanoscale Res Lett. 2019 Mar 15;14(1):100. doi: 10.1186/s11671-019-2925-y.
The FeF·0.33HO cathode material can exhibit a high capacity and high energy density through transfer of multiple electrons in the conversion reaction and has attracted great attention from researchers. However, the low conductivity of FeF·0.33HO greatly restricts its application. Generally, carbon nanotubes (CNTs) and graphene can be used as conductive networks to improve the conductivities of active materials. In this work, the FeF·0.33HO cathode material was synthesized via a liquid-phase method, and the FeF·0.33HO/CNT + graphene nanocomposite was successfully fabricated by introduction of CNTs and graphene conductive networks. The electrochemical results illustrate that FeF·0.33HO/CNT + graphene nanocomposite delivers a high discharge capacity of 234.2 mAh g in the voltage range of 1.8-4.5 V (vs. Li/Li) at 0.1 C rate, exhibits a prominent cycling performance (193.1 mAh g after 50 cycles at 0.2 C rate), and rate capability (140.4 mAh g at 5 C rate). Therefore, the electronic conductivity and electrochemical performance of the FeF·0.33HO cathode material modified with CNTs and graphene composite conductive network can be effectively improved.
FeF·0.33HO正极材料在转化反应中通过多电子转移可展现出高容量和高能量密度，已引起研究人员的高度关注。然而，FeF·0.33HO的低电导率极大地限制了其应用。通常，碳纳米管（CNTs）和石墨烯可作为导电网络来提高活性材料的电导率。在本工作中，通过液相法合成了FeF·0.33HO正极材料，并通过引入CNTs和石墨烯导电网络成功制备了FeF·0.33HO/CNT +石墨烯纳米复合材料。电化学结果表明，FeF·0.33HO/CNT +石墨烯纳米复合材料在0.1 C倍率下于1.8 - 4.5 V（相对于Li/Li）电压范围内具有234.2 mAh g的高放电容量，展现出出色的循环性能（在0.2 C倍率下50次循环后为193.1 mAh g）以及倍率性能（在5 C倍率下为140.4 mAh g）。因此，用CNTs和石墨烯复合导电网络改性的FeF·0.33HO正极材料的电子电导率和电化学性能可得到有效提高。
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