With the rapid growth and advance in the Internet of things and flexible/on-skin electronics, stretchable/flexible energy storage devices are being unprecedentedly needed and widely pursued. However, it remains a great challenge to realize devices with both high storage capacity and satisfactory mechanical stretchability/flexibility. Herein, by synergistically combining 3D printing with electrodeposition, a 3D-printed stretchable structural supercapacitor with thick electrodes and a 3D Negative Poisson's Ratio (NPR) multicellular framework was developed. Benefiting from the well-designed NPR lattice electrode architecture and unique 3D nanoflower-on-nanosheet structured CoNi₂S₄/NiCo-LDHs nanocomposites, the assembled stretchable symmetric supercapacitor was highly stretchable (up to ∼55%) and flexible (up to 180°) with a favorable capacitance of 28.71 F cm⁻³, superior energy density of 0.582 mW h cm⁻³ and satisfied stability in stretching and bending cycles (75.2% of its initial capacitance after 1000 periodic stretch/release cycles), which are highly comparable to those obtained for previously reported stretchable supercapacitors. The strategy proposed here provides new insights in developing next-generation highly customized 3D structural strengthening energy storage devices for human–machine interfaces and real wearable and intelligent miniaturized electronics.

中文翻译：

---

3D打印的可拉伸结构超级电容器，具有主动的可拉伸性/柔性和显着的体积电容

随着物联网和柔性/皮肤电子设备的快速发展和进步，可伸缩/柔性储能设备被空前需求和广泛追求。然而，实现具有高存储容量和令人满意的机械拉伸性/柔韧性的装置仍然是巨大的挑战。本文中，通过将3D打印与电沉积协同组合，开发了具有厚电极和3D负泊松比（NPR）的3D打印可拉伸结构超级电容器。得益于精心设计的NPR晶格电极体系结构和独特的3D纳米片上纳米花结构CoNi ₂ S ₄/ NiCo-LDHs纳米复合材料，组装后的可拉伸对称超级电容器具有高可拉伸性（高达〜55％）和柔韧性（高达180°），具有28.71 F cm ^-3的有利电容，0.582 mW h cm ^-3的优异能量密度在拉伸和弯曲循环中具有令人满意的稳定性（在1000次周期性拉伸/释放循环后，其初始电容的75.2％），与先前报道的可拉伸超级电容器获得的可比性极高。本文提出的策略为开发用于人机界面以及真正的可穿戴和智能微型电子产品的下一代高度定制的3D结构强化储能设备提供了新见识。