Zeng Minghao, Guo Haikun, Wang Gang, Shang Lichao, Zhao Chengji, Li Haolong
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, PR China.
Key Laboratory of High Performance Plastics, Ministry of Education, College of Chemistry, Jilin University, Changchun 130012, PR China.
J Colloid Interface Sci. 2021 Dec;603:408-417. doi: 10.1016/j.jcis.2021.06.110. Epub 2021 Jun 22.
The development of high-temperature supercapacitors highly relies on the explore of stable polymer electrolyte membranes (PEMs) with high ionic conductivities at high-temperature conditions. However, it is a challenge to achieve both high stability and high conductivity in a PEM at elevated temperatures. Herein, we report the fabrication of high-performance proton conductive PEMs suitable for high-temperature supercapacitors (HT-SCs), which is based on a post-assembly strategy to control the rearrangement of polymer networks in the PEMs. This strategy can create cross-linked PEMs with bicontinuous nanostructures, as well as highly stable and highly conductive features. Specifically, a series of bicontinuous PEMs are prepared by the controllable cross-linking of poly(ether-ether-ketone) and poly(4-vinylpyridine), followed by the inducement of phosphoric acid. These PEMs exhibit both a high proton conductivity of 70 mS cm and a high modulus of 39.3 MPa at 150 ℃, which can serve as high-performance electrolytes. The HT-SCs based on these PEMs display a specific capacitance of 138.0 F g and a high capacitance retention of 80.0% after 2500 galvanostatic charge-discharge cycles at 150 ℃, exhibiting excellent high-temperature capacitance and cycle stability. This post-assembly concept can provide a new route to design high-performance PEMs for HT-SC and other energy device applications.
高温超级电容器的发展高度依赖于对在高温条件下具有高离子电导率的稳定聚合物电解质膜（PEM）的探索。然而，在高温下使PEM同时实现高稳定性和高导电性是一项挑战。在此，我们报道了适用于高温超级电容器（HT-SC）的高性能质子传导PEM的制备，其基于一种后组装策略来控制PEM中聚合物网络的重排。该策略可创建具有双连续纳米结构以及高稳定性和高导电性特征的交联PEM。具体而言，通过聚（醚醚酮）和聚（4-乙烯基吡啶）的可控交联，随后引入磷酸，制备了一系列双连续PEM。这些PEM在150℃时表现出70 mS cm的高质子电导率和39.3 MPa的高模量，可作为高性能电解质。基于这些PEM的HT-SC在150℃下进行2500次恒流充放电循环后，显示出138.0 F g的比电容和80.0%的高电容保持率，表现出优异的高温电容和循环稳定性。这种后组装概念可为设计用于HT-SC和其他能量装置应用的高性能PEM提供一条新途径。
