In a flexible energy storage device, the interface between the components not only degrades the electrochemical performance but also makes it mechanically vulnerable. Therefore, interface engineering is important to ensure device performance. Here, we propose a design strategy for the fabrication of seamless energy storage device that maximizes the structural integrity between all-components. Utilizing a rapid phase transition characteristic of agarose, a seamless device composed of carbon cloth, agarose/activated carbon electrode, and agarose electrolyte were prepared. The seamless interface improved areal capacitance and lap-shear strength by 35% (166.6 mF/cm²) and 1000% (12 kPa), respectively, compared to that of the conventional sandwich-type supercapacitor. In addition, the impedance of the seamless device was measured as 80% of that of the sandwich device demonstrating a decrease of interfacial resistance. While the areal capacitance of the seamless device was maintained even after 100 bending cycles, the device failure by interfacial slip for the sandwich device was observed. Considering that flexible electronic devices are subjected to repeated mechanical deformations, the device fabrication strategy using phase changing materials proved to be very effective which can be applied to versatile applications.

在柔性储能装置中，组件之间的界面不仅会降低电化学性能，而且还会使其在机械上变得脆弱。因此，接口工程对于确保器件性能非常重要。在这里，我们提出了一种制造无缝储能装置的设计策略，最大限度地提高所有组件之间的结构完整性。利用琼脂糖的快速相变特性，制备了由碳布、琼脂糖/活性炭电极和琼脂糖电解质组成的无缝装置。无缝界面将面电容和搭接剪切强度提高了 35% (166.6 mF/cm ²）和1000%（12 kPa），分别与传统的夹层型超级电容器相比。此外，测得无缝装置的阻抗为夹层装置阻抗的80%，表明界面电阻有所降低。虽然无缝器件的面积电容即使在 100 次弯曲循环后仍保持不变，但观察到夹层器件因界面滑移而导致器件失效。考虑到柔性电子器件会遭受重复的机械变形，使用相变材料的器件制造策略被证明是非常有效的，可以应用于多种应用。