Department of Electrical Engineering and Computer Sciences, University of California Berkeley, 508 Cory Hall, Berkeley, CA 94720, USA.
Mechanical and Aerospace Engineering, Andlinger Center for Energy and the Environment, Princeton University, D 428 Engineering Quadrangle, Princeton, NJ 08544, USA.
Sci Adv. 2017 Jun 16;3(6):e1602051. doi: 10.1126/sciadv.1602051. eCollection 2017 Jun.
Flexible and stretchable power sources represent a key technology for the realization of wearable electronics. Developing flexible and stretchable batteries with mechanical endurance that is on par with commercial standards and offer compliance while retaining safety remains a significant challenge. We present a unique approach that demonstrates mechanically robust, intrinsically safe silver-zinc batteries. This approach uses current collectors with enhanced mechanical design, such as helical springs and serpentines, as a structural support and backbone for all battery components. We show wire-shaped batteries based on helical band springs that are resilient to fatigue and retain electrochemical performance over 17,000 flexure cycles at a 0.5-cm bending radius. Serpentine-shaped batteries can be stretched with tunable degree and directionality while maintaining their specific capacity. Finally, the batteries are integrated, as a wearable device, with a photovoltaic module that enables recharging of the batteries.
灵活可伸缩的电源是实现可穿戴电子产品的关键技术。开发具有与商业标准相媲美的机械耐久性的柔性可伸缩电池，并在保持安全性的同时具有柔韧性，仍然是一个重大挑战。我们提出了一种独特的方法，展示了机械强度高、本质安全的银锌电池。这种方法使用具有增强机械设计的集流器，例如螺旋弹簧和蛇形线，作为结构支撑和所有电池组件的骨干。我们展示了基于螺旋带弹簧的线状电池，这些电池具有抗疲劳性，在 0.5 厘米弯曲半径下经过 17000 次弯曲循环后仍能保持电化学性能。蛇形电池可以在保持其比容量的同时，以可调节的程度和方向性进行拉伸。最后，将电池集成到一个可穿戴设备中，该设备与光伏模块集成，可对电池进行充电。
