title: Polyethylenimine-Mediated Electrostatic Assembly of MnO2 Nanorods on Graphene Oxides for Use as Anodes in Lithium-Ion Batteries.
abstract: In recent years, the development of electrochemically active materials with excellent lithium storage capacity has attracted tremendous attention for application in high-performance lithium-ion batteries. MnO2-based composite materials have been recognized as one of promising candidates owing to their high theoretical capacity and cost-effectiveness. In this study, a previously unrecognized chemical method is proposed to induce intra-stacked assembly from MnO2 nanorods and graphene oxide (GO), which is incorporated as an electrically conductive medium and a structural template, through polyethylenimine (PEI)-derived electrostatic modulation between both constituent materials. It is revealed that PEI, a cationic polyelectrolyte, is capable of effectively forming hierarchical, two-dimensional MnO2-RGO composites, enabling highly reversible capacities of 880, 770, 630, and 460 mA·h/g at current densities of 0.1, 1, 3, and 5 A/g, respectively. The role of PEI in electrostatically assembled composite materials is clarified through electrochemical impedance spectroscopy-based comparative analysis.
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT) , 141 Kajeongro, Daejeon 305-600, Republic of Korea.
authors.forename: Changju
authors.initials: C
authors.lastname: Chae
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT) , 141 Kajeongro, Daejeon 305-600, Republic of Korea.
authors.forename: Ki Woong
authors.initials: KW
authors.lastname: Kim
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT) , 141 Kajeongro, Daejeon 305-600, Republic of Korea.
authors.forename: Young Jun
authors.initials: YJ
authors.lastname: Yun
authors.affiliation: Department of Materials Science and Engineering, Yonsei University , 50 Yonsei-ro Seodaemun-gu, Seou1 120-749, Republic of Korea.
authors.forename: Daehee
authors.initials: D
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering, Yonsei University , 50 Yonsei-ro Seodaemun-gu, Seou1 120-749, Republic of Korea.
authors.forename: Jooho
authors.initials: J
authors.lastname: Moon
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT) , 141 Kajeongro, Daejeon 305-600, Republic of Korea.
authors.forename: Youngmin
authors.initials: Y
authors.lastname: Choi
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT) , 141 Kajeongro, Daejeon 305-600, Republic of Korea.
authors.forename: Sun Sook
authors.initials: SS
authors.lastname: Lee
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT) , 141 Kajeongro, Daejeon 305-600, Republic of Korea.
authors.forename: Sungho
authors.initials: S
authors.lastname: Choi
authors.affiliation: Division of Advanced Materials, Korea Research Institute of Chemical Technology (KRICT) , 141 Kajeongro, Daejeon 305-600, Republic of Korea.
authors.forename: Sunho
authors.initials: S
authors.lastname: Jeong
keywords: MnO2; assembly; battery; electrostatic; graphene oxide; polyethylenimine