Initiating a wide-temperature-window yarn zinc ion battery by a highly conductive iongel
Materials Today Energy(2020)
摘要
Yarn batteries are promising candidates in portable, flexible and wearable electronics due to its tiny volume, good flexibility and maximum compatibility with textile. However, the-state-of-the-art yarn battery using aqueous electrolyte cannot fulfill the requirement of working normally in extreme weather conditions, such as harsh winters and searing summers. In this research, a quasi-solid-state iongel electrolyte with a high ionic conductivity of 0.016 S cm−1 was synthesized by polymerizing 1-vinyl-3-ethylimidazolium dicyanamide ([Veim][DCA]) and N, N′-methylenebisacrylamide (NNMBA) in zinc acetate (Zn(CH3COO)2) dissolved 1-ethyl-3-methylimidazolium dicyanamide ([Emim][DCA]). A flexible zinc//manganese-dioxide (Zn//MnO2) yarn battery based on this iongel delivers high volumetric capacity of 2.4 mAh cm−3 and length/areal/volumetric energy density of 0.0075 mWh cm−1/0.03 mWh cm−2/2.0 mWh cm−3 at 0 °C, all of which are higher than values of many previously reported devices at room temperature so far. Moreover, compared with these at 0 °C, the volumetric capacity and length/areal/volumetric energy density of the battery get 1.4- and 1.4-fold enhancement when temperature rises to 25 °C, and 1.9- and 2.1-fold enhancement at 60 °C, respectively. This research indicates that our yarn battery is suitable for harsh winters and searing summers, laying a solid foundation for the universal application of wearable electronics.
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关键词
High ionic conductivity,Iongel electrolyte,Yarn battery,Wide temperature range,Flexible
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