High-performance Li-ion batteries based on graphene quantum dot wrapped carbon nanotube hybrid anodes

作     者：Xuewei Zhao Yizeng Wu Yunsong Wang Huaisheng Wu Yawei Yang Zhipeng Wang Linxiu Dai Yuanyuan Shang Anyuan Cao Xuewei Zhao;Yizeng Wu;Yunsong Wang;Huaisheng Wu;Yawei Yang;Zhipeng Wang;Linxiu Dai;Yuanyuan Shang;Anyuan Cao

作者机构：Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871China School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2020年第13卷第4期

页      面：1044-1052页

核心收录：

学科分类：0808[工学-电气工程] 07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 070205[理学-凝聚态物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：A.Y.C.appreciated the financial support from the National Natural Science Foundation o f C hina(No.51672005).S.Y.Y.appreciated the financial support from the National Natural Science Foundation of China(No.51872267).Z.X.W.thanks Qihang Gong for his support and encouragement all the time. 

主　　题：graphene quantum dots carbon nanotubes lithium ion batteries anodes oxygen functional groups 

摘      要：Since Akira Yoshino first proposed the usage of the carbonaceous materials as an anode of lithium ion batteries(LIBs)in 1985,carbonaceous materials such as graphite and graphene have been widely considered as LIB anodes.Here,we explored the application of novel carbonaceous UB anodes incorporating graphene quantum dots(GQDs).We fabricated a freestanding all-carbon electrode based on a porous carbon nanotube(CNT)sponge via a facile in-situ hydrothermal deposition technique,creating coaxial structure of GQD-coated CNTs(GQD@CNTs)through electrostatic interaction and n-n stacking with tunable loading and functionalization.This hybrid structure combined conductive CNTs with highly active GQDs,in which GQDs with predesigned functional groups provided massive storage sites for Li ions and the 3D CNT frameworks avoided the agglomeration of GQDs,together contributing to a high specific capacity(700 mAh·g^-1 at 100 mA·g^-1 after 100 cycles)and rate performance.Even at a high current density of 1,000 mA·g^-1,the reversible specific capacity remained at 483 mAh g-1 after 350 cycles.In particular,the mechanism study demonstrated the important role of oxygen functional groups of GQDs in promoting the performance of the LIB anodes by controlled grafting of GQDs onto various porous-carbon and metal-foam based structures.