Premium
Covalent‐Organic‐Framework‐Based Li–CO 2 Batteries
Author(s) -
Li Xing,
Wang Hui,
Chen Zhongxin,
Xu HaiSen,
Yu Wei,
Liu Cuibo,
Wang Xiaowei,
Zhang Kun,
Xie Keyu,
Loh Kian Ping
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201905879
Subject(s) - materials science , covalent organic framework , cathode , battery (electricity) , overpotential , covalent bond , carbon nanotube , chemical engineering , electrochemistry , anode , current density , nanotechnology , lithium (medication) , ionic bonding , electrode , porosity , composite material , ion , organic chemistry , chemistry , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering
Covalent organic frameworks (COFs) are an emerging class of porous crystalline materials constructed from designer molecular building blocks that are linked and extended periodically via covalent bonds. Their high stability, open channels, and ease of functionalization suggest that they can function as a useful cathode material in reversible lithium batteries. Here, a COF constructed from hydrazone/hydrazide‐containing molecular units, which shows good CO 2 sequestration properties, is reported. The COF is hybridized to Ru‐nanoparticle‐coated carbon nanotubes, and the composite is found to function as highly efficient cathode in a Li–CO 2 battery. The robust 1D channels in the COF serve as CO 2 – and lithium‐ion‐diffusion channels and improve the kinetics of electrochemical reactions. The COF‐based Li–CO 2 battery exhibits an ultrahigh capacity of 27 348 mAh g −1 at a current density of 200 mA g −1 , and a low cut‐off overpotential of 1.24 V within a limiting capacity of 1000 mAh g −1 . The rate performance of the battery is improved considerably with the use of the COF at the cathode, where the battery shows a slow decay of discharge voltage from a current density of 0.1 to 4 A g −1 . The COF‐based battery runs for 200 cycles when discharged/charged at a high current density of 1 A g −1 .