Issue 4, 2021

A dual-protection strategy using CMK-3 coated selenium and modified separators for high-energy Al–Se batteries

Abstract

The aluminum–selenium (Al–Se) battery is a very promising rechargeable battery system due to its high theoretical specific capacity of 1357 mA h g−1 and high average discharge voltage of ∼1.52 V versus Al/Al3+. However, Al–Se batteries suffer poor reversibility, since the intermediate product Se2Cl2 dissolved in the acidic electrolyte causes significant capacity fading. To overcome this critical issue, a dual-protection design with composites of selenium nanoparticles encapsulated in mesoporous carbon (CMK-3) and separators modified by CMK-3 are developed. Because of the great physical blocking of the intermediate product dissolved in the electrolyte, the as-assembled Al–Se batteries can deliver an ultrahigh capacity of ∼1295 mA h g−1 (approximate the theoretical specific capacity) in the first two cycles, and retain a capacity of 651 mA h g−1 (retention rate of 50.3%) over 400 cycles at a current density of 1000 mA g−1. The rational design of the Al–Se batteries with dual protection from the CMK-3 coated Se positive electrode and modified separators is effective in promoting the electrochemical performance of the batteries.

Graphical abstract: A dual-protection strategy using CMK-3 coated selenium and modified separators for high-energy Al–Se batteries

Supplementary files

Article information

Article type
Research Article
Submitted
13 ربيع الأول 1442
Accepted
18 ربيع الثاني 1442
First published
24 ربيع الثاني 1442

Inorg. Chem. Front., 2021,8, 1030-1038

A dual-protection strategy using CMK-3 coated selenium and modified separators for high-energy Al–Se batteries

H. Lei, J. Tu, W. Song, H. Jiao, X. Xiao and S. Jiao, Inorg. Chem. Front., 2021, 8, 1030 DOI: 10.1039/D0QI01302A

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