Carbonized cellulose paper as an effective interlayer in lithium-sulfur batteries

Shiqi Li, Guofeng Ren, Md Nadim Ferdous Hoque, Zhihua Dong, Juliusz Warzywoda, Zhaoyang Fan

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

One of the several challenging problems hampering lithium-sulfur (Li-S) battery development is the so-called shuttling effect of the highly soluble intermediates (Li 2 S 8 –Li 2 S 6 ). Using an interlayer inserted between the sulfur cathode and the separator to capture and trap these soluble intermediates has been found effective in diminishing this effect. Previously, most reported interlayer membranes were synthesized in a complex and expensive process, and might not be suitable for practical cheap batteries. Herein, a facile method is reported to pyrolyze the commonly used cellulose filter paper into highly flexible and conductive carbon fiber paper. When used as an interlayer, such a carbon paper can improve the cell capacity by several folds through trapping the soluble polysulfides. The enhanced electronic conductivity of the cathode, due to the interlayer, also significantly improves the cell rate performance. In addition, it was demonstrated that such an interlayer can also effectively mitigate the self-discharge problem of the Li-S batteries. This study indicates that the cost-effective pyrolyzed cellulose paper has potential as interlayer for practical Li-S batteries.

Original languageEnglish
Pages (from-to)637-643
Number of pages7
JournalApplied Surface Science
Volume396
DOIs
StatePublished - Feb 28 2017

Keywords

  • Cellulose
  • Li-S battery
  • Self-discharge
  • Shuttling effect

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