Issue 10, 2023

Bond modulation of MoSe2+x driving combined intercalation and conversion reactions for high-performance K cathodes

Abstract

The urgent demand for large-scale global energy storage systems and portable electronic devices is driving the need for considerable energy density and stable batteries. Here, Se atoms are introduced between MoSe2 layers (denoted as MoSe2+x) by bond modulation to produce a high-performance cathode for potassium-ion batteries. The introduced Se atoms form covalent Se–Se bonds with the Se in MoSe2, and the advantages of bond modulation are as follows: (i) the interlayer spacing is enlarged which increases the storage space of K+; (ii) the system possesses a dual reaction mechanism, and the introduced Se can provide an additional conversion reaction when discharged to 0.5 V, which improves the capacity further; (iii) the Se atoms confined between MoSe2 layers do not give rise to the shuttle effect. MoSe2+x is compounded with rGO (MoSe2+x-rGO) as a cathode for potassium-ion batteries and displays an ultrahigh capacity (235 mA h g−1 at 100 mA g−1), a long cycle life (300 cycles at 100 mA g−1) and an extraordinary rate performance (135 mA h g−1 at 1000 mA g−1 and 89 mA h g−1 at 2000 mA g−1). Pairing the MoSe2+x-rGO cathode with graphite, the full cell delivers considerable energy density compared to other K cathode materials. The MoSe2+x-rGO cathode also exhibits excellent electrochemical performance for lithium-ion batteries. This study on bond modulation driving combined intercalation and conversion reactions offers new insights into the design of high-performance K cathodes.

Graphical abstract: Bond modulation of MoSe2+x driving combined intercalation and conversion reactions for high-performance K cathodes

Supplementary files

Article information

Article type
Edge Article
Submitted
31 dec 2022
Accepted
09 feb 2023
First published
10 feb 2023
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2023,14, 2528-2536

Bond modulation of MoSe2+x driving combined intercalation and conversion reactions for high-performance K cathodes

T. Lei, M. Gu, H. Fu, J. Wang, L. Wang, J. Zhou, H. Liu and B. Lu, Chem. Sci., 2023, 14, 2528 DOI: 10.1039/D2SC07121E

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