Tailored metal oxide thin film on polyethylene separators for sodium-ion batteries

Jin Il Kim, Jinwoo Heo, Jong Hyeok Park

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The development of polymer separators for Na+-ion batteries has not been of interest because conventional polyolefin (e.g., polyethylene or polypropylene) separators are not suitable for the solvation of Na+-ion-containing electrolytes. Here, we report a simple surface modification method based on chemical vapor deposition of SiO2 applied to a polyethylene separator for Na+-ion batteries. A thin SiO2 layer is coated uniformly onto a porous polymer separator with the negligibly increased total separator thickness. Improved wetting ability of the SiO2-film-coated polyethylene separators with a polar electrolyte based on ethylene carbonate (EC) and dimethyl carbonate (DMC) solvents is demonstrated, with superior electrochemical performance characteristics, such as initial specific capacity, C-rate and cyclic stability. In addition, the thin SiO2 coating film results in substantially suppressed thermal shrinkage, which may lead to improvements in the thermal and dimensional stability of Na+-ion batteries. Compared to a glass-fiber separator and the conventional PE separator, the metal-oxide-thin-film-coated polyethylene separator will accelerate the development of Na+-ion batteries for various electrochemical energy storage applications.

Original languageEnglish
Pages (from-to)A1965-A1969
JournalJournal of the Electrochemical Society
Volume164
Issue number9
DOIs
Publication statusPublished - 2017

Bibliographical note

Funding Information:
This work was supported by the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (20152010103470). This work was supported by the NRF of Korea Grant funded by the Ministry of Science, ICT, and Future Planning (NRF-2015M2A2A6A01045277, 2014M3A7B4052200).

Publisher Copyright:
© 2017 The Electrochemical Society.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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