Thermal-Switching and Repeatable Self-Protective Hydrogel Polyelectrolytes for Energy Storage Applications of Flexible Electronics
Thermal-Switching and Repeatable Self-Protective Hydrogel Polyelectrolytes for Energy Storage Applications of Flexible Electronics
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用于柔性电子储能应用的热开关和可重复自保护水凝胶聚电解质
DOI：
10.1021/acsaem.1c00922
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发表时间：
2021-06
影响因子：
6.4
通讯作者：
Xu Xinhua
中科院分区：
文献类型：
--
作者：
Zhang Hao;Xue Pan;Liu Jialiang;Xu Xinhua
目前，电化学储能装置是便携式fl柔性电子产品的主要能源之一。然而，储能装置内部的持续热积累具有导致热失控的风险。防止热危害和动态调整热行为对于解决fl可伸缩储能设备带来的安全问题至关重要，特别是对于各种与人体皮肤密切接触的可穿戴消费电子产品。在这里，我们报道了一种基于温度响应型poly(N-isopropylacrylamide-co-N-methylolacrylamide)水凝胶聚电解质的具有可逆热开关行为的自保护fl可伸缩超级电容器。随着温度的升高，比电容逐渐减小，这是因为电解质分子链之间的热缔合抑制了导电离子的迁移，并切换了离子传输通道，以及水凝胶表面的亲水fi疏水转变(ff−疏水转变)。利用fi共聚网络的热可逆性，降温后的容量损失可以恢复，即使在fiVE加热/冷却循环中，SP-FSC的自我保护功能也是可重复的，而不是现有的一次性策略。此外，SP-FSC具有宽的温度窗口(25ff70°C)，具有不同的电化学性能。因此，ff的这项工作为解决fl可再生能源的热安全问题提供了一条诱人的、不可丢弃的途径。
Currently, electrochemical energy storage devices are one of the main energy sources of portable flexible electronics. However, the continuous heat accumulation inside the energy storage device possesses the risk of inducing thermal runaway. Preventing thermal hazards and dynamically adjusting thermal behavior are of paramount importance to solve the safety issues caused by flexible energy storage devices, especially for various wearable consumer electronic products that are in close contact with the human skin. Here, we report a self-protective flexible supercapacitor (SP-FSC) with reversible thermal-switching behavior based on temperatureresponsive poly(N-isopropylacrylamide-co-N-methylolacrylamide) (PNIPAM/NMAM) hydrogel polyelectrolytes. As the temperature increases, the specific capacitance is gradually reduced because the thermal association between the copolymer molecular chains of the electrolyte can suppress the migration of conductive ions and switch off the ion-transport channels, as well as hydrophilic−hydrophobic transition upon the surface of the hydrogel. Benefiting from thermal reversibility of the PNIPAM copolymer network, the capacity loss can be restored after cooling down and the selfprotection function of the SP-FSC is repeatable even during five heating/cooling cycles, instead of the existing one-time strategy. Furthermore, the SP-FSC can exhibit different electrochemical performances with a wide temperature window (25−70 °C). Therefore, this work offers an appealing and nondisposable avenue to address thermal safety issues for flexible energy storage sources.
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影响因子：
29.4
作者：
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通讯作者：
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影响因子：
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作者：
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