Defect Engineering of Disordered Carbon Anodes with Ultra-High Heteroatom Doping Through a Supermolecule-Mediated Strategy for Potassium-Ion Hybrid Capacitors  

作　　者：Lei Zhao Shirong Sun Jinxin Lin Lei Zhong Liheng Chen Jing Guo Jian Yin Husam N.Alshareef Xueqing Qiu Wenli Zhang 

机构地区：[1]Guangdong Provincial Key Laboratory of Plant Resources Biorefinery,School of Chemical Engineering and Light Industry,Guangdong University of Technology(GDUT),100 Waihuan Xi Road,Panyu District,Guangzhou 510006,People’s Republic of China [2]Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory(Rongjiang Laboratory),Jieyang 515200,People’s Republic of China [3]Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,People’s Republic of China [4]Materials Science and Engineering,Physical Science and Engineering Division,King Abdullah University of Science and Technology(KAUST),Thuwal 23955‑6900,Saudi Arabia [5]School of Advanced Manufacturing,Research Institute of Green Chemical Engineering and Advanced Materials,Guangdong University of Technology(GDUT),Jieyang,Jieyang 515200,People’s Republic of China

出　　处：《Nano-Micro Letters》2023年第3期248-265,共18页纳微快报（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(22108044,22208061);the Research and Development Program in Key Fields of Guangdong Province(2020B1111380002);the Basic Research and Applicable Basic Research in Guangzhou City(202201010290);the financial support from the Guangdong Provincial Key Laboratory of Plant Resources Biorefinery(2021GDKLPRB07)。

摘　　要：Amorphous carbons are promising anodes for high-rate potassium-ion batteries.Most low-temperature annealed amorphous carbons display unsatisfactory capacities.Heteroatom-induced defect engineering of amorphous carbons could enhance their reversible capacities.Nevertheless,most lignocellulose biomasses lack heteroatoms,making it a challenge to design highly heteroatom-doped carbons(>10 at%).Herein,we report a new preparation strategy for amorphous carbon anodes.Nitrogen/sulfur co-doped lignin-derived porous carbons(NSLPC)with ultra-high nitrogen doping levels(21.6 at%of N and 0.8 at%of S)from renewable lignin biomacromolecule precursors were prepared through a supramolecule-mediated pyrolysis strategy.This supermolecule/lignin composite decomposes forming a covalently bonded graphitic carbon/amorphous carbon intermediate product,which induces the formation of high heteroatom doping in the obtained NSLPC.This unique pyrolysis chemistry and high heteroatom doping of NSLPC enable abundant defective active sites for the adsorption of K+and improved kinetics.The NSLPC anode delivered a high reversible capacity of 419 mAh g^(-1)and superior cycling stability(capacity retention of 96.6%at 1 A g^(-1)for 1000 cycles).Potassiumion hybrid capacitors assembled by NSLPC anode exhibited excellent cycling stability(91%capacity retention for 2000 cycles)and a high energy density of 71 Wh kg^(-1)at a power density of 92 W kg^(-1).

关 键 词：Defect HETEROATOM Active sites SUPRAMOLECULE Potassium-ion hybrid capacitors 

分 类 号：TM53[电气工程—电器]