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Issue 5, 2021
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Phase engineering of cobalt hydroxide toward cation intercalation

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Abstract

Multi-cation intercalation in aqueous and neutral media is promising for the development of high-safety energy storage devices. However, developing a new host matrix for reversible cation intercalation as well as understanding the relationship between cation intercalation and the interlayer structure is still a challenge. In this work, we demonstrate layered cobalt hydroxides as a promising host for cation interaction, which exhibit high metal ion (Li+, Na+, K+, Mg2+ and Ca2+) storage capacities after phase transformation. Moreover, it is found that α-Co(OH)2 with an intercalated structure is more conducive to phase transition after electrochemical activation than β-Co(OH)2. As a result, the activated α-Co(OH)2 delivers four times higher capacity in multi-cation storage than activated β-Co(OH)2. Meanwhile, the α-Co(OH)2 after activation also shows an ultralong cycle life with capacity retention of 93.9% after 5000 cycles, which is also much superior to that of β-Co(OH)2 (∼74.8%). Thus, this work displays the relationship between cation intercalation and the interlayer structure of layered materials, which is important for designing multi-ion storage materials in aqueous media.

Graphical abstract: Phase engineering of cobalt hydroxide toward cation intercalation

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Supplementary files

Article information


Submitted
13 Nov 2020
Accepted
29 Nov 2020
First published
15 Dec 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2021,12, 1756-1761
Article type
Edge Article

Phase engineering of cobalt hydroxide toward cation intercalation

J. Li, Z. Li, F. Zhan and M. Shao, Chem. Sci., 2021, 12, 1756
DOI: 10.1039/D0SC06250B

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    [Original citation] - Published by The Royal Society of Chemistry.

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