Stable freestanding Li-ion battery cathodes by in situ conformal coating of conducting polypyrrole on NiS-carbon nanofiber films

Xiaoyan Li, Yuming Chen, Jizhao Zou, Xierong Zeng, Li Min Zhou, Haitao Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)


Nickel sulfide (NiS) is an attractive and promising cathode material for lithium ion batteries (LIBs) with a high theoretical capacity of 590 mAh g−1, which is much higher than that of LiMO2(M = Co, Fe, Mn, etc.). Here, we demonstrate a facile synthesis of hybrid materials by in situ polymerization of a conducting polymer of polypyrrole (PPy) on NiS-carbon nanofiber (CNF) films to form high-performance freestanding LIB cathodes. PPy coating maintains the structural integrity and accommodates volumetric change of NiS upon cycling, and also helps enhance electronic conduction. CNF film provides a good mechanical and effective electrical interconnection in the entire electrode. Using the freestanding NiS-PPy-CNF hybrid film with a high NiS loading of 5.5 mg cm−2as a cathode, we demonstrate a high discharge capacity of 635 mAh g−1at 0.1 A g−1and exceptional areal capacity of 3.03 mAh cm−2at 0.7 mA cm−2with long cycling life over 700 cycles, representing the best performance of NiS-based electrodes so far.
Original languageEnglish
Pages (from-to)360-365
Number of pages6
JournalJournal of Power Sources
Publication statusPublished - 1 Nov 2016


  • Freestanding electrodes
  • Lithium-ion battery
  • NiS
  • Polypyrrole

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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