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
30 okt 2020
Accepted
03 dec 2020
First published
09 dec 2020

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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