Dual Active Site of the Azo and CarbonylModified Covalent Organic Framework for High-Performance Li Storage

發布日期：2020/3/16 9:00:15

https://dx.doi.org/10.1021/acsenergylett.0c00069

ABSTRACT: Organic electrode materials play a crucial role in environmentally friendly

and sustainable lithium-ion batteries (LIBs) due to their abundance, high theoretical

capacity, inexpensiveness, and recyclability. However, critical issues such as fewer redox

active sites and poor structural stability limit their extensive application in LIBs. Herein,

a unique covalent organic framework (Tp-Azo-COF) with a dual active site of NN and

CO is designed and successfully applied as the anode material for LIBs. Benefifiting

from its abundance of active sites, large conjugate structure, large surface area, and

accessible Li+transport channels, the Tp-Azo-COF anode materials present high

electrochemical kinetics and structural stability. The assembled LIBs deliver a specifific

capability of 305.97 mAh g?1at a current density of 1000 mA g?1after 3000 cycles. This

work may inspire avenues for the development of advanced organic materials of

inexpensive, sustainable, and durable rechargeable batteries.