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Kombucha scoby-based carbon as a green scaffold for high-capacity cathode in lithium–sulfur batteries

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Abstract

A ternary composite cathode of sulfur, poly(acrylonitrile) (PAN), and carbon was investigated for the possible use in Li–S batteries. The carbon used in this work was obtained from kombucha tea or tea fungus with potassium hydroxide activation process. The flaky structure of functionalized carbon derived from a waste part of kombucha culture has micropores and mesopores with a large pore volume, which are favorable for impregnating elemental sulfur. The ration of the ternary composite was based on a simple process involving a dispersion of the carbon with that of S/PAN, followed by a simple heat treatment. The cathode delivered an initial discharge capacity of 1666 mAh g−1 at C/10 rate and a 100th cycle capacity of 838 mAh g−1. This study exploits the cumulative contribution of a conductive carbon and PAN in the improved performance of the cathode.

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Funding

This study was financially supported by BSR of University Grants Commission (UGC), New Delhi, India, and Ministry of Human Resource Development RUSA-Phase 2.0 grant sanctioned vide Lt.No.F-24-51/2014 U Policy (TNMulti Gen), Dept. of Education, Government of India.

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Authors and Affiliations

  1. #120, Energy Materials Lab, Department of Physics, Science Block, Alagappa University, Karaikudi, Tamil Nadu, 630003, India

    Krishnaveni Kalaiappan, Sivakumar Marimuthu & Subadevi Rengapillai

  2. Electrochemical Power Systems Division, CSIR-Central Electrochemical Research Institute, Karaikudi, Tamil Nadu, 630006, India

    Raja Murugan &  Premkumar T.

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  1. Krishnaveni Kalaiappan
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Correspondence to Sivakumar Marimuthu.

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Figure S1

CV curve for S/PAN composite cathode. Fig. S2 Rate capability of S/PAN, S/KC and S/PAN/KC composite (DOC 133 kb)

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Kalaiappan, K., Marimuthu, S., Rengapillai, S. et al. Kombucha scoby-based carbon as a green scaffold for high-capacity cathode in lithium–sulfur batteries. Ionics 25, 4637–4650 (2019). https://doi.org/10.1007/s11581-019-03018-0

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