Nanoporous NiO/Ni(OH) 2 plates incorporated with carbon nanotubes as active materials of rechargeable hybrid zinc batteries for improved energy efficiency and high-rate capability

Peng Tan, Bin Chen, Haoran Xu, Weizi Cai, Meilin Liu, Zongping Shao, Meng Ni

Research output: Journal article publicationJournal articleAcademic researchpeer-review

20 Citations (Scopus)

Abstract

Although rechargeable zinc-air batteries are one of the promising power sources, the commercialization is hindered by a variety of technical hurdles, especially the low energy efficiency and poor rate capability due to the low discharge voltage. Herein, we report a high-performance composite composed of nanoporous NiO/Ni(OH) 2 plates incorporated with carbon nanotubes. When used as the active material, unlike any single types of zinc-based batteries, the electrochemical reactions in both nickel-zinc and zinc-air batteries are combined. A high voltage of 1.7 V is obtained in the nickel-zinc battery region and a high capacity of over 800 mAh gZn -1 is demonstrated in the zinc-air battery region, attributed to the high pseudocapacitance and excellent activities of NiO/Ni(OH) 2 nanoporous plates and the high electrical conductivity of carbon nanotubes. In addition, the battery can be cycled steadily for over 192 times at 5 mA cm -2 while maintaining the capacity at the energy efficiency of higher than 60%. Moreover, the discharge voltage profile and obtainable capacity remain unchanged even when the charge current density is increased by 8 times (from 2 to 16 mA cm -2 ), demonstrating excellent high-rate charge capability. The results shed light on further explorations of active materials for high-performance rechargeable hybrid batteries.

Original languageEnglish
Pages (from-to)A2119-A2126
JournalJournal of the Electrochemical Society
Volume165
Issue number10
DOIs
Publication statusPublished - 1 Jan 2018

ASJC Scopus subject areas

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

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