Open AccessHoneycomb‐like carbon materials derived from coffee extract via a “salty” thermal treatment for high‐performance Li‐I 2 batteries
Author(s) -
Su Zhong,
Ling Han Yeu,
Li Meng,
Qian Shangshu,
Chen Hao,
Lai Chao,
Zhang Shanqing
Publication year - 2020
Publication title -
carbon energy
Language(s) - English
Resource type - Journals
ISSN - 2637-9368
DOI - 10.1002/cey2.40
Subject(s) - materials science , anode , carbon fibers , cathode , supercapacitor , heteroatom , battery (electricity) , energy storage , chemical engineering , electrochemistry , nanotechnology , electrical conductor , composite material , chemistry , electrode , composite number , ring (chemistry) , physics , organic chemistry , engineering , power (physics) , quantum mechanics
Sustainable, conductive, and porous carbon materials are ideal for energy storage materials. In this study, honeycomb‐like carbon materials (HCM) are synthesized via a “salty” thermal treatment of abundant and sustainable coffee extract. Systematic materials characterization indicates that the as‐prepared HCM consists of heteroatoms (N and O, etc.) doped ultra‐thin carbon framework, possesses remarkable specific surface area, and excellent electrical conductivity. Such properties bestow HCM outstanding materials to be the blocking layer for Li‐I 2 battery, significantly eliminating the dissolution of I 2 in the cathode region and stopping the I 2 from shutting to anode compartment. Furthermore, our electrochemical investigation suggests that HCM could incur surface pseudo‐capacitive iodine‐ions charge storage and contribute additional energy storage capacity. As a result, the resultant Li‐I 2 battery achieves a robust and highly reversible capacity of 224.5 mAh·g −1 at the rate of 10 C. Even under a high rate of 50 C, the remarkable capacity of the as‐prepared Li‐I 2 battery can still be maintained at 120.2 mAh·g −1 after 4000 cycles.