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

作　　者：Zhong Su Han Yeu Ling Meng Li Shangshu Qian Hao Chen Chao Lai Shanqing Zhang 

机构地区：[1]Centre for Clean Environment and Energy,and School of Environment and Science,Gold Coast Campus,Griffith University,Queensland,Australia [2]Key Laboratory of Materials Processing and Mold(Zhengzhou University),Ministry of Education,Zhengzhou University,Zhengzhou,China

出　　处：《Carbon Energy》2020年第2期265-275,共11页碳能源（英文）

基　　金：This study was financially supported by the Australia Research Council Discovery Projects(DP170103721 andDP180102003);We also acknowledge the computational support from the Australian Government through the National Computational Infrastructure(NCI)under the National Computational Merit Allocation Scheme and the Pawsey Supercomputing Centre with funding from the Australian Government and the Government of Western Australia.

摘　　要：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.

关 键 词：adsorption blocking layer honeycomb-like carbon materials Li-I2 battery pseudo-capacity 

分 类 号：TM912[电气工程—电力电子与电力传动]