Honeycomb‐like carbon materials derived from coffee extract via a “salty” thermal treatment for high‐performance Li‐I2 batteries

Carbon Energy

Han Yeu Ling¹  Shanqing Zhang¹  Hao Chen¹  Meng Li¹  Shangshu Qian¹  Zhong Su¹  Chao Lai¹ 

[1] Centre for Clean Environment and Energy, and School of Environment and Science, Gold Coast Campus Griffith University Queensland Australia;

关键词: adsorption;    blocking layer;    honeycomb‐like carbon materials;    Li‐I2 battery;    pseudo‐capacity;   

DOI  :  10.1002/cey2.40

来源: DOAJ

【 摘 要 】

Abstract 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‐I2 battery, significantly eliminating the dissolution of I2 in the cathode region and stopping the I2 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‐I2 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‐I2 battery can still be maintained at 120.2 mAh·g−1 after 4000 cycles.

【 授权许可】

Unknown