Wu Yunyun, Mechael Sara S, Chen Yiting, Carmichael Tricia Breen
Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B 3P4, Canada.
ACS Appl Mater Interfaces. 2020 Nov 18;12(46):51679-51687. doi: 10.1021/acsami.0c16801. Epub 2020 Nov 6.
The advancement of wearable electronics depends on the seamless integration of lightweight and stretchable energy storage devices with textiles. Integrating brittle energy storage materials with soft and stretchable textiles, however, presents a challenging mechanical mismatch. It is critical to protect brittle energy storage materials from strain-induced damage and at the same time preserve the softness and stretchability of the functionalized e-textile. Here, we demonstrate the strategic use of a warp-knitted velour fabric in an "island-bridge" architectural strain-engineering design to prepare stretchable textile-based lithium-ion battery (LIB) electrodes. The velour fabric consists of a warp-knitted framework and a cut pile. We integrate the LIB electrode into this fabric by solution-based metallization to create the warp-knitted framework current collector "bridges" followed by selective deposition of the brittle electroactive material CuS on the cut pile "islands". As the textile electrode is stretched, the warp-knitted framework current collector elongates, while the electroactive cut pile fibers simply ride along at their anchor points on the framework, protecting the brittle CuS coating from strain and subsequent damage. The textile-based stretchable LIB electrode exhibited excellent electrical and electrochemical performance with a current collector sheet resistance of 0.85 ± 0.06 Ω/sq and a specific capacity of 400 mAh/g at 0.5 C for 300 charging-discharging cycles as well as outstanding rate capability. The electrical performance and charge-discharge cycling stability of the electrode persisted even after 1000 repetitive stretching-releasing cycles, demonstrating the protective functionality of the textile-based island-bridge architectural strain-engineering design.
可穿戴电子设备的发展依赖于轻质且可拉伸的储能设备与纺织品的无缝集成。然而，将脆性储能材料与柔软可拉伸的纺织品相结合，会出现具有挑战性的机械不匹配问题。保护脆性储能材料免受应变诱导的损伤，同时保持功能化电子纺织品的柔软性和可拉伸性至关重要。在此，我们展示了在“岛桥”结构应变工程设计中战略性地使用经编天鹅绒织物来制备基于纺织品的可拉伸锂离子电池（LIB）电极。天鹅绒织物由经编框架和割绒组成。我们通过基于溶液的金属化将LIB电极集成到这种织物中，以创建经编框架集流体“桥”，随后在割绒“岛”上选择性沉积脆性电活性材料硫化铜。当纺织品电极被拉伸时，经编框架集流体伸长，而电活性割绒纤维仅在其在框架上的锚固点处随之移动，保护脆性硫化铜涂层免受应变及后续损伤。基于纺织品的可拉伸LIB电极表现出优异的电学和电化学性能，集流体表面电阻为0.85±0.06Ω/sq，在0.5C下进行300次充放电循环时比容量为400mAh/g，并且具有出色的倍率性能。即使在1000次重复拉伸 - 释放循环后，电极的电学性能和充放电循环稳定性依然存在，证明了基于纺织品的岛桥结构应变工程设计的保护功能。
