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Flexible and free-standing ternary Cd2GeO4 nanowire/graphene oxide/CNT nanocomposite film with improved lithium ion battery performance

机译:具有改善的锂离子电池性能的柔性自支撑三元Cd2GeO4纳米线/氧化石墨烯/ CNT纳米复合膜

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摘要

To realize flexible lithium-ion batteries (LIBs), the design of flexible electrode/current collector materials with high mechanical flexibility, superior conductivity and excellent electrochemical performance and electrical stability are highly desirable. In this work, we developed a new ternary Cd2GeO4 nanowire/graphene oxide/carbon nanotube nanocomposite (Cd2GeO4 NW/GO/CNT) film electrode. Benefiting from the efficient combination of GO and Cd2GeO4 NWs, our Cd2GeO4 NW/GO/CNT composite film exhibits a capacity of 784 mA h g(-1) after 30 cycles at 200 mA g(-1), which is 2.7 times higher than that of Cd2GeO4 NW/CNT film (290 mA h g(-1)). At a higher rate of 400 mA g(-1) and 1 A g(-1), the Cd2GeO4 NW/GO/CNT film delivers a stable capacity of 617 and 397 mA h g(-1), respectively. Even at 2.5 A g(-1), it still exhibits a high rate capacity of 180 mA h g(-1). The flexible Cd2GeO4 NW/GO/CNT film clearly demonstrates good cycling stability and rate performance for anode materials in LIBs. This route may be extended to design other flexible free-standing metal germanate nanocomposite anode materials.
机译:为了实现柔性锂离子电池(LIB),非常需要设计具有高机械柔性,优异的导电性以及优异的电化学性能和电稳定性的柔性电极/集流体材料。在这项工作中,我们开发了一种新的三元Cd2GeO4纳米线/氧化石墨烯/碳纳米管纳米复合材料(Cd2GeO4 NW / GO / CNT)薄膜电极。得益于GO和Cd2GeO4 NW的有效结合,我们的Cd2GeO4 NW / GO / CNT复合膜在200 mA g(-1)下经过30个循环后显示出784 mA hg(-1)的容量,是其的2.7倍Cd2GeO4 NW / CNT膜(290 mA hg(-1))。 Cd2GeO4 NW / GO / CNT膜以400 mA g(-1)和1 A g(-1)的较高速率分别提供了617和397 mA h g(-1)的稳定容量。即使在2.5 A g(-1)的情况下,它仍具有180 mA h g(-1)的高倍率容量。柔性Cd2GeO4 NW / GO / CNT膜清楚地证明了LIB中阳极材料的良好循环稳定性和倍率性能。该路线可以扩展为设计其他柔性的自支撑金属锗酸盐纳米复合阳极材料。

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