High-performance stretchable electrodes prepared from elastomeric current collectors and binders
High-performance stretchable electrodes prepared from elastomeric current collectors and binders
复制标题
由弹性集流体和粘合剂制备的高性能可拉伸电极
DOI：
10.1039/c7ta07185j
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发表时间：
2017
影响因子：
11.9
通讯作者：
Gao Xiang
中科院分区：
文献类型：
--
作者：
Zhou Ao;Sim Richard;Luo Yingwu;Gao Xiang
高性能可拉伸电极的制备是实现可拉伸锂离子电池的主要挑战。理想的解决方案是使用具有高导电性的可扩展集流体;然而，尚未报道相关工作。商业粘合剂难以承受拉伸变形并保证活性材料和集电器之间的充分接触。在这里，可拉伸电极的基础上开发的聚（苯乙烯）-b-聚（丙烯酸正丁酯）-聚（苯乙烯）/单壁碳纳米管复合材料作为弹性集流体和聚（苯乙烯）-b-聚（丙烯酸甲酯）-聚（苯乙烯）作为弹性体粘合剂。揭示了集流体的电导率与电极性能之间的关系。发现当可伸缩集电体的电导率高于10 - 2 S cm-1时，可伸缩电极表现出与由刚性金属集电体制备的电极相当的电化学性能。可以达到50%的变形，这对于大多数可穿戴设备来说已经足够了。随着碳纳米管含量的减少，可以在不严重牺牲性能的情况下达到80%的变形。已经经受100次拉伸循环的可拉伸电极显示出与初始预拉伸状态相似的性能，表明电极是稳定的并且可逆地变形。基于它们的性能，可拉伸集电器可能很快就会取代可拉伸电子产品中使用的电池中的刚性金属集电器。
The preparation of high-performance stretchable electrodes is the main challenge in achieving stretchable lithium-ion batteries. The ideal solution is to use an extensible current collector with high conductivity; however, no related work has been reported yet. Commercial binders have difficulty withstanding tensile deformation and guaranteeing sufficient contact between active materials and current collectors. Here, stretchable electrodes are developed based on a poly(styrene)-b-poly(n-butyl acrylate)–poly(styrene)/single-walled carbon nanotube composite as an elastic current collector and poly(styrene)-b-poly(methyl acrylate)–poly(styrene) as an elastomeric binder. The relationship between the conductivity of the current collector and the electrode performance is revealed. It is found that when the conductivity of the stretchable current collector is higher than 10−2 S cm−1, the stretchable electrodes exhibit equivalent electrochemical performance to those prepared from rigid metal current collectors. 50% deformation can be reached which is enough for most wearable devices. With the decrease of carbon nanotube content, 80% deformation can be reached without badly sacrificing the performance. Stretchable electrodes that have been subjected to 100 stretching cycles display similar performance to the initial pre-stretched state, indicating that the electrode is stable and deforms reversibly. Based on their performance, stretchable current collectors may soon replace rigid metal ones in batteries used in stretchable electronics.