Textile-derived freestanding Fe3O4/Porous carbon cloth composite electrode for flexible Li-ion batteries with remarkable cycling stability
Textile-derived freestanding Fe3O4/Porous carbon cloth composite electrode for flexible Li-ion batteries with remarkable cycling stability
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DOI：
10.1016/j.apsusc.2021.150761
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发表时间：
2021-11
影响因子：
6.7
通讯作者：
Zhikang Liu;Kai Huang;Junming Kang;Lei Liu;Shan Wang;C. Xiong
中科院分区：
文献类型：
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作者：
Zhikang Liu;Kai Huang;Junming Kang;Lei Liu;Shan Wang;C. Xiong
常用的柔性基底（碳布、碳纳米管薄膜、石墨烯薄膜）作为集流体提供的容量可以忽略不计，复杂的制备工艺和高昂的成本进一步限制了其实用性。在此，利用独特的染色技术和随后的热解，成功制备了结构可控的柔性Fe3O4/多孔碳布复合电极。锂存储贡献的分析证实，碳布基体在 1 mA cm−2 的高电流密度下提供 0.53 mAh cm−2 的容量，因为碳纤维被铁基物质部分蚀刻。正如我们所预期的那样，该复合电极在 1 mA cm−2 的高电流密度下经过 100 次循环后可提供 1.53 mAh cm−2 的高面积容量。优异的性能归因于碳涂层 Fe3O4 电极具有多种优势，包括提供有效的电子/离子传输网络、缓解 Fe3O4 纳米颗粒的体积膨胀以及具有更高的电容贡献，从而实现优异的动力学。更重要的是，具有坚固特性的柔性电极赋予软包电池卓越的性能和出色的灵活性。就此而言，低成本、大规模的生产方法以及令人鼓舞的电化学成果将为柔性电子产业的发展带来新的曙光。
The flexible substrates commonly used (carbon cloth, CNT film, graphene film) as a current collector provide negligible capacity, the complicated preparation process and high cost further limit its practicality. Herein, a flexible Fe3O4/porous carbon cloth composite electrode with controllable structure was successfully prepared by utilizing the unique dyeing technique and subsequent pyrolysis. The analysis of lithium storage contribution confirmed that the carbon cloth matrix provides 0.53 mAh cm−2capacity at a high current density of 1 mA cm−2because the carbon fibers were partly etched by Fe-base species. As we expected, this composite electrode delivers a high areal capacity of 1.53 mAh cm−2at a high current density of 1 mA cm−2after 100 cycles. The excellent performance can be ascribed to that the carbon coated Fe3O4electrode possesses several advantages, including rendering an efficient electron/ion transport network, relieving the volume expansion of Fe3O4nanoparticles, and enabling superior kinetics with higher capacitive contribution. More importantly, the flexible electrodes with robust nature endow the pouch-cell with superior performance and excellent flexibility. In this regard, the low-cost and large-scale production methodology as well as the promising electrochemical results will bring a new dawn for the development of flexible electronic industry.