Jia Xiaoteng, Ma Xuenan, Zhao Li, Xin Meiying, Hao Yulei, Sun Peng, Wang Chenguang, Chao Danming, Liu Fangmeng, Wang Caiyun, Lu Geyu, Wallace Gordon
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University Changchun 130012 China
Jilin Provincial Key Laboratory of Pediatric Neurology, Department of Pediatric Neurology, The First Hospital of Jilin University 130021 China.
Chem Sci. 2023 Jan 25;14(8):2123-2130. doi: 10.1039/d2sc06342e. eCollection 2023 Feb 22.
Implanted rechargeable batteries that can provide energy over a sufficient lifetime and ultimately degrade into non-toxic byproducts are highly desirable. However, their advancement is significantly impeded by the limited toolbox of electrode materials with a known biodegradation profile and high cycling stability. Here we report biocompatible, erodible poly(3,4-ethylenedioxythiophene) (PEDOT) grafted with hydrolyzable carboxylic acid pendants. This molecular arrangement combines the pseudocapacitive charge storage from the conjugated backbones and dissolution hydrolyzable side chains. It demonstrates complete erosion under aqueous conditions in a pH-dependent manner with a predetermined lifetime. The compact rechargeable Zn battery with a gel electrolyte offers a specific capacity of 31.8 mA h g (57% of theoretical capacity) and outstanding cycling stability (78% capacity retention over 4000 cycles at 0.5 A g). Subcutaneous implantation of this Zn battery into Sprague-Dawley (SD) rats demonstrates complete biodegradation and biocompatibility. This molecular engineering strategy presents a viable avenue for developing implantable conducting polymers with a predetermined degradation profile and high energy storage capability.
能够在足够长的使用寿命内提供能量并最终降解为无毒副产物的植入式可充电电池是非常理想的。然而，具有已知生物降解特性和高循环稳定性的电极材料种类有限，这严重阻碍了它们的发展。在此，我们报告了接枝有可水解羧酸侧基的生物相容性、可蚀性聚（3,4-乙撑二氧噻吩）（PEDOT）。这种分子排列结合了共轭主链的赝电容电荷存储和可水解侧链的溶解。它在水性条件下以pH依赖的方式完全侵蚀，具有预定的寿命。具有凝胶电解质的紧凑型可充电锌电池的比容量为31.8 mA h g（理论容量的57%），并具有出色的循环稳定性（在0.5 A g下4000次循环后容量保持率为78%）。将这种锌电池皮下植入斯普拉格-道利（SD）大鼠体内，证明了其完全生物降解性和生物相容性。这种分子工程策略为开发具有预定降解特性和高储能能力的可植入导电聚合物提供了一条可行的途径。
