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Electrochemically activated spinel manganese oxide for rechargeable aqueous aluminum battery
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Journal Article
Electrochemically activated spinel manganese oxide for rechargeable aqueous aluminum battery
2019
Overview
Aluminum is a naturally abundant, trivalent charge carrier with high theoretical specific capacity and volumetric energy density, rendering aluminum-ion batteries a technology of choice for future large-scale energy storage. However, the frequent collapse of the host structure of the cathode materials and sluggish kinetics of aluminum ion diffusion have thus far hampered the realization of practical battery devices. Here, we synthesize Al
x
MnO
2
·
n
H
2
O by an in-situ electrochemical transformation reaction to be used as a cathode material for an aluminum-ion battery with a configuration of Al/Al(OTF)
3
-H
2
O/Al
x
MnO
2
·
n
H
2
O. This cell is not only based on aqueous electrolyte chemistry but also delivers a high specific capacity of 467 mAh g
−1
and a record high energy density of 481 Wh kg
−1
. The high safety of aqueous electrolyte, facile cell assembly and the low cost of materials suggest that this aqueous aluminum-ion battery holds promise for large-scale energy applications.
The instability of the host structure of cathode materials and sluggish aluminium ion diffusion are the major challenges facing the Al-ion battery. Here the authors show Al
x
MnO
2
·
n
H
2
O as a cathode that allows for reversible Al
3+
(de)intercalation in an aqueous electrolyte and impressive electrochemical performance for a battery device.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
