Issue 10, 2019

Single-crystal and hierarchical VSe2 as an aluminum-ion battery cathode

Abstract

Aluminum-ion batteries (AIBs) with high safety, low cost and abundant resources have been regarded as a promising candidate for relieving the partial resource shortage of Li-ion batteries. However, the absence of an appropriate cathode material with a high capacity and good cycling properties makes it hard to apply them for electronic devices. In this work, a new aluminum-ion battery is assembled with a hierarchical vanadium diselenide (VSe2) cathode based on an ionic liquid electrolyte 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl)/AlCl3. Brick-like VSe2 can be successfully synthesized through a facile hydrothermal method. As the cathode of AIBs, VSe2 delivers two obvious discharge voltage plateaus of ∼1.2 V and ∼0.6 V vs. Al/AlCl4. The initial specific discharge capacity is as high as 650 mA h g−1 at a current density of 100 mA g−1, and the reversible capacity is about 50 mA h g−1 with a coulombic efficiency of about 94% after 100 cycles. Moreover, the energy storage mechanism of VSe2 in aluminum-ion batteries is confirmed.

Graphical abstract: Single-crystal and hierarchical VSe2 as an aluminum-ion battery cathode

Supplementary files

Article information

Article type
Paper
Submitted
08 may. 2019
Accepted
26 jul. 2019
First published
29 jul. 2019

Sustainable Energy Fuels, 2019,3, 2717-2724

Single-crystal and hierarchical VSe2 as an aluminum-ion battery cathode

H. Lei, M. Wang, J. Tu and S. Jiao, Sustainable Energy Fuels, 2019, 3, 2717 DOI: 10.1039/C9SE00288J

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