Design and synthesis of an interfacial layer of the polysulfide immobilizer for lithium-sulfur batteries by the one-pot hydrothermal method

Hyunjin Yu, Dongjin Byun, Joong Kee Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

To overcome the low electrical conductivity and large volume expansion of a sulfur cathode during electrochemical reactions, a composite of SnO 2 nanoparticles with 5–10 nm size dispersed on reduced graphene oxide (rGO) sheets and sulfur (rGO/SnO 2 /S) was prepared by a one-pot hydrothermal process. This cathode shows 1.2-fold higher interfacial Li ion diffusivity (1.8 × 10 −12 cm 2 s −1 ) than that of an rGO/S cathode (1.5 × 10 −12 cm 2 s −1 ). This improvement is attributed to the synergistic effect of the hybrid matrix comprising rGO sheets and SnO 2 . The rGO sheets provide a fast electron pathway and accommodate a large amount of sulfur. Moreover, the dispersed SnO 2 nanoparticle acts as an immobilizer to prevent the dissolution of polysulfide during the electrochemical reaction. The synthesized rGO/SnO 2 /S cathode also exhibits an electrical resistivity of 4.4 × 10 −1 Ω cm due to interfacial modification. Further, it exhibits improved electrochemical performance with an initial discharge capacity of 1591.57 mA h g −1 at 0.1 C, which stabilizes to 606.98 mA h g −1 at 0.2 C after 100 cycles. In addition, it shows a discharge capacity of 575.45 mA h g −1 even at a high current density of 5 C.

Original languageEnglish
Pages (from-to)154-160
Number of pages7
JournalApplied Surface Science
Volume461
DOIs
Publication statusPublished - 2018 Dec 15

Bibliographical note

Funding Information:
This work was supported by research grants of NRF ( NRF-2017R1A2B2002607 ) funded by the National Research Foundation under the Ministry of Science and ICT, Republic of Korea . This work is also supported by Korea Institutional Program ( 2E28141 ). This work was supported by the International Collaborative Energy Technology R&D Program (project no. 20178530000140 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP).

Funding Information:
This work was supported by research grants of NRF (NRF-2017R1A2B2002607) funded by the National Research Foundation under the Ministry of Science and ICT, Republic of Korea. This work is also supported by Korea Institutional Program (2E28141). This work was supported by the International Collaborative Energy Technology R&D Program (project no. 20178530000140) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP).

Publisher Copyright:
© 2018 Elsevier B.V.

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

Keywords

  • Immobilizer of polysulfide
  • One-pot hydrothermal process
  • Reduced graphene oxide (rGO)
  • Surface diffusion
  • Tin oxide (SnO ) nano particles

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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