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.
Highlights
There is an increasing demand of high safety, high energy density and low cost energy storage device for wearable or flexible electronics
MnO2/reduced graphene oxide (rGO) electrode has been successfully fabricated by a vacuum filtration process, which results in a flexible and binder/additive free cathode for zinc-ion batteries (ZIBs)
The results strengthen our hypothesis that rGO is ideally suited for good ionic transport into the electrode and electronic transport from the electrode
Summary
There is an increasing demand of high safety, high energy density and low cost energy storage device for wearable or flexible electronics. In this aspect, aqueous zinc-ion batteries (ZIBs) have received incremental attention because of their high safety, abundance of Zn source, and environmental friendliness.[1,2,3,4,5] MnO2 is a most common low cost cathode material for ZIBs, which provides high capacity, large voltage window (~2 V) and high output voltage (~1.3 V).[6,7,8] While the exact reaction mechanism of.
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