Conductor-Free Anode of Transition Metal Dichalcogenide Nanosheets Self-Assembled with Graft Polymer Li-Ion Channels

Chanho Park, Young Hwan Kim, Hyeokjung Lee, Han Sol Kang, Taebin Kim, Seung Won Lee, Kyuho Lee, Kwang Bum Kim, Cheolmin Park

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The development of anodes for lithium-ion batteries (LIBs) based on liquid-phase-exfoliated 2D transition metal dichalcogenide (TMD) nanosheets has been studied extensively because their intrinsic capacity is higher than graphite. Since most semiconducting TMDs possess low electrical conductivity and lithium-ion diffusivity, expensive processes are necessary such as the addition of conductive fillers, chemically converted metallic phase transformation, and topological nano-fabrication. Here, a novel conductor-free TMD nanosheet anode with graft-polymer ionic channels that ensures high stability and rate capability of the LIB is presented. The fluorinated polymer binder grafted with ionomers allows not only the efficient exfoliation of TMD nanosheets in the liquid phase to guarantee stable sheet-to-sheet separation but also provides self-assembled ionic channels through which lithium ions in the electrolyte readily arrive close to the surface of the nanosheets. Efficient electrochemical reduction of lithium ions occurs on the surface of the binary anode of MoS2 nanosheets, self-assembled with graft polymer ionic channels, resulting in a high-performance LIB with stability (90% retention rate after 1,000 cycles), rate capability (50% at 5 A g−1), and high cell capacity (933.1 mAh g−1 at 0.1 A g−1). These TMD anodes that do not require additional processes, and offer a novel strategy for developing high performance large-scale TMD-based LIBs.

Original languageEnglish
Article number2003243
JournalAdvanced Energy Materials
Volume11
Issue number6
DOIs
Publication statusPublished - 2021 Feb 11

Bibliographical note

Funding Information:
This project was supported by the National Research Foundation of Korea (NRF) (Creative Materials Discovery Program funded by the Ministry of Science and ICT, Grant No. NRF‐2018M3D1A1058536) and the Korean government (MEST) (Grant No. 2020R1A2B5B03002697). This research also received support from the Ministry of Trade, Industry & Energy (MOTIE), Korea, under the Industrial Technology Innovation program (no. 10063274) and the Technology Innovation Program (20012430), the third stage of the Brain Korea 21 Plus project.

Funding Information:
This project was supported by the National Research Foundation of Korea (NRF) (Creative Materials Discovery Program funded by the Ministry of Science and ICT, Grant No. NRF-2018M3D1A1058536) and the Korean government (MEST) (Grant No. 2020R1A2B5B03002697). This research also received support from the Ministry of Trade, Industry & Energy (MOTIE), Korea, under the Industrial Technology Innovation program (no. 10063274) and the Technology Innovation Program (20012430), the third stage of the Brain Korea 21 Plus project.

Publisher Copyright:
© 2020 Wiley-VCH GmbH

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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