High-performance flexible energy storage and harvesting system for wearable electronics.
High-performance flexible energy storage and harvesting system for wearable electronics.
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DOI：
10.1038/srep26122
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发表时间：
2016-05-17
影响因子：
4.6
通讯作者：
Arias AC
中科院分区：
文献类型：
--
作者：
Ostfeld AE;Gaikwad AM;Khan Y;Arias AC
本文报道了一种集成锂离子电池和非晶硅太阳能组件的柔性电源的设计和运行，优化为可穿戴健康监测设备供电。电池由印刷阳极和阴极层组成，分别基于石墨和锂钴氧化物，在薄的柔性集流器上。其能量密度为6.98 mWh/cm2，在3C放电倍率下容量保持率为90%，在100次充放电循环和600次机械弯曲下容量保持率为~99%。在充分的阳光和室内照明条件下，使用具有适当电压和尺寸的太阳能模块为电池充电，并且增加太阳能模块可以延长电池在充电周期之间的使用寿命，同时为负载供电。此外，我们表明，通过选择适当的负载占空比，平均负载电流可以匹配太阳能组件电流，电池可以保持恒定的充电状态。最后，该电池被用于为脉搏血氧仪供电，证明了其作为可穿戴医疗设备电源的有效性。
This paper reports on the design and operation of a flexible power source integrating a lithium ion battery and amorphous silicon solar module, optimized to supply power to a wearable health monitoring device. The battery consists of printed anode and cathode layers based on graphite and lithium cobalt oxide, respectively, on thin flexible current collectors. It displays energy density of 6.98 mWh/cm2 and demonstrates capacity retention of 90% at 3C discharge rate and ~99% under 100 charge/discharge cycles and 600 cycles of mechanical flexing. A solar module with appropriate voltage and dimensions is used to charge the battery under both full sun and indoor illumination conditions, and the addition of the solar module is shown to extend the battery lifetime between charging cycles while powering a load. Furthermore, we show that by selecting the appropriate load duty cycle, the average load current can be matched to the solar module current and the battery can be maintained at a constant state of charge. Finally, the battery is used to power a pulse oximeter, demonstrating its effectiveness as a power source for wearable medical devices.