假电容
材料科学
插层(化学)
电化学
氧化还原
堆积
电解质
阳极
电极
超级电容器
化学工程
无机化学
纳米技术
有机化学
物理化学
化学
工程类
冶金
作者
Zhongli Hu,Xiaolin Zhao,Zhenzhu Li,Sha Li,Pengfei Sun,Gulian Wang,Qiaobao Zhang,Jianjun Liu,Li Zhang
标识
DOI:10.1002/adma.202104039
摘要
Organic electrode materials have shown extraordinary promise for green and sustainable electrochemical energy storage devices, but usually suffer from low specific capacity and poor rate capability, which is largely caused by inactive components and diffusion-controlled Li+ intercalation. Herein, high-rate Li+ intercalation pseudocapacitance in organic molecular crystals is achieved through introducing weak secondary bonding channels, far exceeding their theoretical capacity based on redox chemistry at functional groups. The authors' combined experimentally electrochemical characterization with first-principles calculations show that the heterocyclic organic molecule 2,2'-bipyridine-4,4'-dicarboxylic acid (BPDCA) crystal permits a four-electron redox reaction at conventional CO and CN groups and a six-electron intercalation pseudocapacitance along conjugated alkene hydrogen bonding channels (H2 NC5 H⋯OC(OH)) and heterocyclic aromatic stacking channels (C5 H3 N⋯NH3 C5 ). The BPDCA electrode delivers an ultrahigh reversible capacity of 1206 mAh g-1 at 0.5 A g-1 and an exceptional rate capability. A 4.8 V high-energy/power-density BPDCA anode-based hybrid Li-ion capacitor is thus realized. This work opens a new avenue for developing organic intercalation pseudocapacitive materials via secondary bonding structure design.
科研通智能强力驱动
Strongly Powered by AbleSci AI