Flexible high energy density zinc-ion batteries enabled by binder-free MnO2/reduced graphene oxide electrode

Yuan Huang, Jiuwei Liu, Qiyao Huang, Zijian Zheng, Pritesh Hiralal, Fulin Zheng, Dilek Ozgit, Sikai Su, Shuming Chen, Ping Heng Tan, Shengdong Zhang, Hang Zhou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

33 Citations (Scopus)

Abstract

We demonstrate a rechargeable zinc-ion battery with high energy density and cyclability using MnO2 and reduced graphene oxide (MnO2/rGO) electrode. The flexible and binder free electrode, with high MnO2 mass ratio (80 wt% of MnO2), is fabricated using vacuum filtration without any additional additives other than rGO. Compared to batteries with conventional MnO2 electrodes, the Zn–MnO2/rGO battery shows a significant enhanced capacity (332.2 mAh g-1 at 0.3 A g-1), improved rate capability (172.3 mAh g-1 at 6 A g-1) and cyclability. The capacity retention remains 96% after 500 charge/discharge cycles at 6 A g-1. The high MnO2 mass ratio makes MnO2/rGO electrode advantageous when the capacity is normalized to the whole electrode, particularly at high rates. The calculated gravimetric energy density of Zn–MnO2/rGO battery is 33.17 W h kg-1, which is comparable to the existing commercial lead-acid batteries (30–40 W h kg-1). Furthermore, the discharge profile and capacity of our Zn–MnO2/rGO battery shows no deterioration during bending test, indicating good flexibility. As a result, zinc-ion battery is believed to be a promising technology for powering next generation flexible electronics.

Original languageEnglish
Article number21
Journalnpj Flexible Electronics
Volume2
Issue number1
DOIs
Publication statusPublished - 1 Dec 2018

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Materials Science(all)

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