In situ 3D printing of implantable energy storage devices
In situ 3D printing of implantable energy storage devices
复制标题
DOI：
10.1016/j.cej.2020.128213
复制
发表时间：
2021-04-01
影响因子：
15.1
通讯作者：
Noshadi, Iman
中科院分区：
文献类型：
--
作者：
Krishnadoss, Vaishali;Kanjilal, Baishali;Noshadi, Iman
对可穿戴生物电子设备日益增长的需求推动了对微尺度生物电子制造的巨大研究工作。为了确保功能性和可靠性，可穿戴生物电子设备需要与独立的内部储能系统集成，以避免外部来源的频繁充电过程。超级电容器由于具有长循环寿命、高功率密度和快速充放电速率等优点而被认为是一种电能来源。小型化、生物相容性和生物可降解性是实现植入式超级电容器的关键。植入式生物电子设备的快速原位 3D 打印可以满足这些需求。然而，由于其物理化学性质不理想，使用现有材料进行生物电子学的原位 3D 打印仍然具有挑战性。在这里，我们提出了一种基于生物离子液体（BIL）功能化生物聚合物的新型材料平台，当暴露于可见光时可以形成水凝胶电解质。通过对这些聚合物电解质进行 3D 原位生物打印，并结合流变优化的石墨烯水凝胶-合成锂皂石 (GH-L) 混合物作为电极材料，创建了精细结构、交叉指状、生物相容性和可植入的软微型超级电容器 (MSC)。水凝胶电解质的比电容接近200F/g，而MSC在1A/g的电流密度下比电容接近16μF/g，体积电容接近44μF/cm(3)，循环稳定性高达10,000次循环，能量密度几乎与植入式电池一样高，功率密度达到植入式超级电容器的水平。这种新颖的材料平台能够利用集成的终身电源对柔性生物电子结构进行原位 3D 打印。
The increasing demand for wearable bioelectronic devices has driven tremendous research effort on the fabrication of bioelectronics in microscale. To ensure the functionality and reliability, wearable bioelectronics need to be integrated with independent and internal energy storage systems to avoid frequent charging process from external sources. The supercapacitors has been considered as an electric energy source due to benefits such as a long cycle life, a high power density and fast charge-discharge rate. Miniaturization, biocompatibility, and biodegradability are the primary keys to achieving the requisites for implantable supercapacitors. Rapid, in situ 3D printing of implantable bioelectronic devices can address these needs. However, in situ 3D printing of bioelectronics using currently available materials has remained challenging due to their suboptimal physicochemical properties. Here, we present a novel material platform based on bio ionic liquid (BIL) functionalized biopolymers which can form a hydrogel electrolyte when exposed to visible light. Fine-structure, interdigitated, biocompatible, and implantable soft micro-supercapacitors (MSC) were created by 3D in situ bioprinting of these polymer electrolytes in combination with rheologically optimized graphene hydrogel-laponite (GH-L) blend as electrode material. The hydrogel electrolyte had a specific capacitance of similar to 200F/g, while the MSC had a specific capacitance of similar to 16 mu F/g at a current density of 1 A/g, volumetric capacitance of similar to 44 mu F/cm(3), cyclic stability up to 10,000 cycles, energy densities nearly as high as implantable batteries, and a power density level of implantable supercapacitors. This novel material platform enables in situ 3D printing of flexible bioelectronics structures with integrated life-long power source.