3 years ago

[ASAP] Seaweed Biomass-Derived Flame-Retardant Gel Electrolyte Membrane for Safe Solid-State Supercapacitors

[ASAP] Seaweed Biomass-Derived Flame-Retardant Gel Electrolyte Membrane for Safe Solid-State Supercapacitors
Tingting Ye, Daohao Li, Hongli Liu, Xilin She, Yanzhi Xia, Shuchao Zhang, Huawei Zhang, Dongjiang Yang
Gel polymer electrolytes (GPEs) have received a great deal of attention for use in solid-state supercapacitors (SSCs). However, a majority of the reported GPEs, such as petroleum-derived poly(vinyl alcohol), suffer from flammability, poor water retention, and low ionic conductivity, resulting in poor safety and low capacitance. Herein, we report a high-performance flame-retardant GPE (FRGPE) for SSCs using natural and sustainable marine biomass alginate as a precursor. The obtained lithium alginate/C2H3LiO2 (Li-Alg/LiOAc) FRGPE not only offers excellent flame-retardant performance (high oxygen index value, 35%) but also can effectively retain water to avoid swelling behavior at high temperatures. Therefore, it can completely resolve the safety problems of SSCs. Importantly, the seaweed GPE displays a considerably high ionic conductivity (32.6 mS cm–1) because of the amorphous structure and abundant oxygen of the polymer. Accordingly, the safe SSC fabricated by FRGPE with activated carbon electrodes delivers a high specific capacitance, excellent rate performance, and superior stability. The natural and sustainable seaweed GPEs could be promising electrolytes for developing safe and high-performance SSCs.

Publisher URL: http://dx.doi.org/10.1021/acs.macromol.8b01955

DOI: 10.1021/acs.macromol.8b01955

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