Tempura-like carbon/carbon composite as advanced anode materials for K-ion batteries  

作　　者：Hao-Jie Liang Zhen-Yi Gu Xue-Ying Zheng Wen-Hao Li Ling-Yun Zhu Zhong-Hui Sun Yun-Feng Meng Hai-Yue Yu Xian-Kun Hou Xing-Long Wu 

机构地区：[1]MOE Key Laboratory for UV Light-Emitting Materials and Technology,Northeast Normal University,Changchun 130024,China [2]Key Laboratory of Preparation and Application of Environmental Friendly Materials(Jilin Normal University),Ministry of Education,Changchun 130103,China [3]Institute of New Energy for Vehicles,Tongji University,201804 Shanghai,China [4]CAS Key Laboratory of Nanosystem and Hierarchical Fabrication,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,100190 Beijing,China [5]Center for Advanced Analytical Science,School of Chemistry and Chemical Engineering,MOE Key Laboratory for Water Quality and Conservation of the Pearl River Delta,Guangzhou University,Guangzhou 510006,China [6]National&Local United Engineering Laboratory for Power Batteries,Faculty of Chemistry,Northeast Normal University,Changchun 130024,China

出　　处：《Journal of Energy Chemistry》2021年第8期589-598,I0012,共11页能源化学（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(No.91963118);the 111 Project(No.B13013);supported by the Open Project Program of Key Laboratory of Preparation and Application of Environmental Friendly Materials(Jilin Normal University),Ministry of Education,China(No.2020004)。

摘　　要：Graphite as a promising anode candidate of K-ion batteries(KIBs)has been increasingly studied currently,but corresponding rate performance and cycling stability are usually inferior to amorphous carbon materials.To protect the layer structure and further boost performance,tempura-like carbon/carbon nanocomposite of graphite@pitch-derived S-doped carbon(G@PSC)is designed and prepared by a facile and low-temperature modified molten salt method.This robust encapsulation structure makes their respective advantages complementary to each other,showing mutual promotion of electrochemical performances caused by synergy effect.As a result,the G@PSC electrode is applied in KIBs,delivering impressive rate capabilities(465,408,370,332,290,and 227 m A h g^(-1)at 0.05,0.2,0.5,1,2,and 5 A g^(-1))and ultralong cyclic stability(163 m A g^(-1)remaining even after 8000 cycles at 2 A g^(-1)).On basis of ex-situ studies,the sectionalized K-storage mechanism with adsorption(pseudocapacitance caused by S doping)-intercalation(pitch-derived carbon and graphite)pattern is revealed.Moreover,the exact insights into remarkable rate performances are taken by electrochemical kinetics tests and density functional theory calculation.In a word,this study adopts a facile method to synthesize high-performance carbon/carbon nanocomposite and is of practical significance for development of carbonaceous anode in KIBs.

关 键 词：K-ion batteries Anode materials Carbon/carbon composite S doping Cyclic stability DFT calculation 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ127.11[化学工程—无机化工] TB332[一般工业技术—材料科学与工程]