Highly compressible and superior low temperature tolerant supercapacitors based on dual chemically crosslinked PVA hydrogel electrolytes,Journal of Materials Chemistry A

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Highly compressible and superior low temperature tolerant supercapacitors based on dual chemically crosslinked PVA hydrogel electrolytes
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/01/21 , DOI: 10.1039/c9ta12424a
Zhenzhen Liu _{1,

2,

3,

4} , Junmei Zhang _{1,

2,

3,

4} , Jing Liu _{1,

2,

3,

4} , Yanjun Long _{1,

2,

3,

4} , Liming Fang _{4,

5,

6,

7,

8} , Qingwen Wang _{1,

2,

3,

4} , Tao Liu _{1,

2,

3,

4}

Affiliation

It remains a challenge for flexible supercapacitors to maintain high electrochemical performance under high compressive stress and subzero temperature conditions simultaneously. Here, a highly compressible and superior low temperature tolerant supercapacitor is fabricated comprising a designed dual chemically crosslinked PVA hydrogel electrolyte (DN + EG hydrogel) by incorporating an EG/H₂O binary solvent. The synthesized DN + EG hydrogel displays a significant improvement of compressive stress compared to a single chemically crosslinked PVA hydrogel (25-fold) and a DN − EG hydrogel (5.3-fold), and also exhibits a high compressive stress (15.5 MPa), excellent shape recovery properties and a high ionic conductivity (0.48 S m⁻¹) even at −40 °C. These impressive compressibility and anti-freezing properties benefit from the increased hydrogen bonding interactions between the first and second networks, and the solvent molecules and polymer chains. Remarkably, the fabricated supercapacitors show a high capacitance retention under strong compressive stress (nearly 100% retention) or after four thousand cycles of 180° bending (86.5% retention) at −30 °C, displaying prominent compression-resistant properties at subzero temperature. It is believed that this work paves a new way for developing high performance compression-resistant energy storage devices which are compatible with extremely cold environments.

中文翻译：

基于双化学交联的PVA水凝胶电解质的高度可压缩且优异的耐低温超级电容器

对于柔性超级电容器来说，在高压缩应力和零度以下温度条件下同时保持高电化学性能仍然是一个挑战。在此，通过掺入EG / H ₂ O二元溶剂，制造了包括设计的双化学交联的PVA水凝胶电解质（DN + EG水凝胶）的高度可压缩且优异的耐高温超级电容器。与单一的化学交联的PVA水凝胶（25倍）和DN-EG水凝胶（5.3倍）相比，合成的DN + EG水凝胶显示出显着的压缩应力，并且还显示出高的压缩应力（15.5 MPa），优异的形状恢复性能和高离子电导率（0.48 S m ^-1），即使在−40°C时也是如此。这些令人印象深刻的可压缩性和抗冻性得益于第一和第二网络以及溶剂分子和聚合物链之间增加的氢键相互作用。值得注意的是，所制造的超级电容器在强压缩应力下（接近100％的保持力）或在-30°C下经过四千次180°弯曲循环（86.5％的保持力）后显示出很高的电容保持率，在零度以下温度下显示出显着的抗压性能。可以认为，这项工作为开发与极端寒冷环境兼容的高性能抗压缩储能装置铺平了道路。

更新日期：2020-04-01

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