Shen Caiwei, Xie Yingxi, Zhu Bingquan, Sanghadasa Mohan, Tang Yong, Lin Liwei
University of California at Berkeley, Berkeley, CA, 94720, USA.
School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou, Guangdong, 510641, China.
Sci Rep. 2017 Oct 30;7(1):14324. doi: 10.1038/s41598-017-14854-3.
Flexible power sources with load bearing capability are attractive for modern wearable electronics. Here, free-standing supercapacitor fabrics that can store high electrical energy and sustain large mechanical loads are directly woven to be compatible with flexible systems. The prototype with reduced package weight/volume provides an impressive energy density of 2.58 mWh g or 3.6 mWh cm, high tensile strength of over 1000 MPa, and bearable pressure of over 100 MPa. The nanoporous thread electrodes are prepared by the activation of commercial carbon fibers to have three-orders of magnitude increase in the specific surface area and 86% retention of the original strength. The novel device configuration woven by solid electrolyte-coated threads shows excellent flexibility and stability during repeated mechanical bending tests. A supercapacitor watchstrap is used to power a liquid crystal display as an example of load-bearing power sources with various form-factor designs for wearable electronics.
具有承载能力的柔性电源对现代可穿戴电子产品具有吸引力。在此，可存储高电能并承受大机械负载的独立式超级电容器织物被直接编织，以与柔性系统兼容。具有减小的封装重量/体积的原型提供了令人印象深刻的2.58 mWh/g或3.6 mWh/cm³的能量密度、超过1000 MPa的高拉伸强度以及超过100 MPa的可承受压力。通过对商业碳纤维进行活化制备的纳米多孔线状电极，其比表面积增加了三个数量级，且保留了原始强度的86%。由固体电解质涂层线编织而成的新型器件结构在反复机械弯曲测试中表现出优异的柔韧性和稳定性。作为具有各种外形设计的可穿戴电子产品的承载电源示例，一款超级电容器表带被用于为液晶显示器供电。
