Electrochemically Stable Rechargeable Lithium-Sulfur Batteries with a Microporous Carbon Nanofiber Filter for Polysulfide

Sheng Heng Chung, Pauline Han, Richa Singhal, Vibha Kalra, Arumugam Manthiram

研究成果: Article同行評審

226 引文 斯高帕斯(Scopus)

摘要

As a primary component in lithium-sulfur (Li-S) batteries, the separator may require a custom design in order to facilitate electrochemical stability and reversibility. Here, a custom separator with an activated carbon nanofiber (ACNF)-filter coated onto a polypropylene membrane is presented. The entire configuration is comprised of the ACNF filter arranged adjacent to the sulfur cathode so that it can filter out the freely migrating polysulfides and suppress the severe polysulfide diffusion. Four differently optimized ACNF-filter-coated separators have been developed with tunable micropores as an investigation into the electrochemical and engineering design parameters of functionalized separators. The optimized parameters that are verified by electrochemical and microstructural analyses require the coated ACNF filter to possess the following: (i) a porous architecture with abundant micropores, (ii) small micropore sizes, and (iii) high electrical conductivity and effective electrolyte immersion. It is found that the ACNF20-filter-coated separator demonstrates an overall superior boost in the electrochemical utilization (discharge capacity: 1270 mA h g-1) and polysulfide retention (capacity fade rate: 0.13% cycle-1 after 200 cycles). These results show that the modified thin-film-coating technique is a viable approach to designing ultratough ACNF-filter-coated separators with outstanding mechanical strength and flexibility as an advanced component in Li-S cells.

原文English
文章編號1500738
期刊Advanced Energy Materials
5
發行號18
DOIs
出版狀態Published - 2015 9月 1

All Science Journal Classification (ASJC) codes

  • 可再生能源、永續發展與環境
  • 材料科學(全部)

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