Carbon fiber cloth@VO2 (B): excellent binder-free flexible electrodes with ultrahigh mass-loading
Carbon fiber cloth@VO2 (B): excellent binder-free flexible electrodes with ultrahigh mass-loading
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碳纤维布@VO2 (B)：具有超高质量负载的优异无粘合剂柔性电极
DOI：
10.1039/c6ta00728g
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发表时间：
2016-01-01
影响因子：
11.9
通讯作者：
Han, Miao
中科院分区：
文献类型：
--
作者：
Li, Site;Liu, Gang;Han, Miao
柔性电池由于其在柔性显示器、便携式消费电子设备和基于薄膜的电子设备中的有前途的应用，近年来引起了广泛的关注。然而，它们的实际应用仍然受到它们在柔性电极中的低活性材料质量负载和差的锂存储性能的限制。在这项工作中，我们首次成功地在碳纤维布（CFC）上生长了高度结晶的VO 2纳米带阵列。该策略只涉及一个简单的一锅溶剂热方法。作为用于LIB的无粘合剂的柔性电极，即使活性材料质量负载显著地达到高达5.2 mg/平方厘米，这种新型CFC@VO2（B）纳米带阵列阴极电极仍然表现出145 mA h g-1的比容量（理论容量的90%），优异的循环性能，200次循环后容量保持率在90%以上，（1000 mA g−1），以及在高达2000 mA g− 1（2000 mA g−1）的高电流密度下的高倍率性能。这种优异的阴极材料在高功率柔性LIB中是非常期望的。本文所述的CFC和高面积质量负载的活性材料的有效组合是设计高性能柔性电池，特别是高功率柔性电池的可行且有效的解决方案。
Flexible batteries have attracted much attention in recent years due to their promising applications in flexible displays, portable consumer electronic devices, and thin-film-based electronics. However, their practical applications are still limited by their low active material mass-loading in flexible electrodes and poor lithium storage performances. In this work, we have successfully grown highly crystalline VO2 nanobelt arrays on carbon fiber cloth (CFC) for the first time. The strategy only involves a facile one-pot solvothermal method. As binder-free flexible electrodes for LIBs, even with active material mass loading dramatically reaching up to 5.2 mg per square centimeter, such a novel CFC@VO2 (B) nanobelt array cathode electrode still exhibits a specific capacity of 145 mA h g−1 (90% of theoretical capacity), excellent cyclability with capacity retention over 90% after 200 cycles at ∼9C (1000 mA g−1), and high rate capability at high current densities up to ∼20C (2000 mA g−1). Such an excellent cathode material is very desirable in high-power flexible LIBs. The effective combination of CFC and a high areal mass loading of active materials described in this paper is a feasible and effective solution to design high-performance flexible batteries, especially high-power flexible batteries.