Polyethylenimine-Mediated Electrostatic Assembly of MnO2 Nanorods on Graphene Oxides for Use as Anodes in Lithium-Ion Batteries

Changju Chae, Ki Woong Kim, Young Jun Yun, Daehee Lee, Jooho Moon, Youngmin Choi, Sun Sook Lee, Sungho Choi, Sunho Jeong

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32 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)11499-11506
Number of pages8
JournalACS Applied Materials and Interfaces
Volume8
Issue number18
DOIs
Publication statusPublished - 2016 May 11

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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