质子两性离子水凝胶电解质通过离子跳跃和 Grotthuss 传输机制向-50 °C 下工作的固体超级电容器的防冻,Advanced Science

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质子两性离子水凝胶电解质通过离子跳跃和 Grotthuss 传输机制向-50 °C 下工作的固体超级电容器的防冻
Advanced Science ( IF 14.3 ) Pub Date : 2022-07-26 , DOI: 10.1002/advs.202201679
Weigang Sun ₁ , Zhen Xu ₁ , Congde Qiao ₁ , Bingxi Lv ₁ , Ligang Gai ₁ , Xingxiang Ji ₁ , Haihui Jiang ₁ , Libin Liu ₁

Affiliation

水凝胶电解质因其离子电导率高、环境友好、无泄漏等特点而被广泛应用于固体储能装置中。然而，水凝胶电解质不耐冷冻。在此，通过丙烯酰胺和两性离子单体在 1 m H ₂ SO _{4存在下的无规共聚制备了在 -50 °C 下具有 1.51 mS cm}^–1超导率的高质子导电两性离子水凝胶电解质。和乙二醇 (EG)。防冻性能和低温电导率归因于系统中组分与水分子之间的氢键和离子键，可以通过改变单体比例和EG含量来调节。聚合物链的离子基团上的质子跳跃迁移和Grotthuss质子传输机制是高质子传导性的原因，而Grotthuss传输主要是在聚合物链的玻璃态。电解质组装的超级电容器 (SC)在 25 °C 和 62.0 F g ^–1时提供 93.5 F g ^{–1的高比电容}在 -50 °C 下，10 000 次循环后的电容保持率分别为 91.1% 和 81.5%。SC 甚至可以在 −70 °C 下工作。该电解质的性能优于大多数报道的抗冻水凝胶电解质，并且在低温设备中具有很高的潜力。

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Antifreezing Proton Zwitterionic Hydrogel Electrolyte via Ionic Hopping and Grotthuss Transport Mechanism toward Solid Supercapacitor Working at −50 °C

Hydrogel electrolyte is widely used in solid energy storage devices because of its high ionic conductivity, environmental friendliness, and non-leakage property. However, hydrogel electrolyte is not resistant to freezing. Here, a high proton conductive zwitterionic hydrogel electrolyte with super conductivity of 1.51 mS cm^–1 at −50 °C is fabricated by random copolymerization of acrylamide and zwitterionic monomer in the presence of 1 m H₂SO₄ and ethylene glycol (EG). The antifreezing performance and low temperature conductivity are ascribed to hydrogen bonds and ionic bonds between the components and water molecules in the system and can be tuned by changing the monomer ratio and EG contents. The proton hopping migration on the ionic group of the polymer chains and Grotthuss proton transport mechanism are responsible for the high proton conductivity while Grotthuss transport is dominated at the glassy state of the polymer chains. The electrolyte-assembled supercapacitor (SC) offers high specific capacitance of 93.5 F g^–1 at 25 °C and 62.0 F g^–1 at −50 °C with a capacitance retention of 91.1% and 81.5% after 10 000 cycles, respectively. The SC can even work at −70 °C. The electrolyte outperforms most reported antifreezing hydrogel electrolytes and has high potential in low-temperature devices.

更新日期：2022-07-26

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