Issue 47, 2017

Egg-shell structured LiCoO2 by Cu2+ substitution to Li+ sites via facile stirring in an aqueous copper(ii) nitrate solution

Abstract

For practical, high-energy lithium ion batteries, we introduce an egg-shell structured LiCoO2, enabling a credible performance with a high cut-off potential of 4.4 V, simply prepared by only stirring in 0.5 mM Cu(NO3)2 aqueous solution at room temperature without costly heat treatment. Through this, a very robust structure in which the Li+ ions in the LiCoO2 structure were substituted with Cu2+ is selectively synthesized on the surface of active material particles. The egg-shell structured LiCoO2 presents excellent cyclability and high coulombic efficiency even in a high potential range of 4.4 V (vs. Li/Li+) to allow a high specific capacity. Additionally, the surface-modified LiCoO2 reaches a high capacity at a fast discharge rate of 20C even after a high temperature cycling sequence. The intended surface modification is also carefully investigated by systematic analyses of STEM, SEM and XPS. Finally, the electrochemical performance of a graphite/surface-modified LiCoO2 full-cell exhibits an excellent capacity retention of nearly 90% over 1000 cycles. It is concluded that the surface modification method in which the LiCoO2 powder is added to a low-concentration aqueous solution of copper nitrate and stirred at room temperature is effective in improving the cycle life of LiCoO2 at high potentials.

Graphical abstract: Egg-shell structured LiCoO2 by Cu2+ substitution to Li+ sites via facile stirring in an aqueous copper(ii) nitrate solution

Supplementary files

Article information

Article type
Paper
Submitted
16 Aug 2017
Accepted
08 Nov 2017
First published
09 Nov 2017

J. Mater. Chem. A, 2017,5, 24892-24900

Egg-shell structured LiCoO2 by Cu2+ substitution to Li+ sites via facile stirring in an aqueous copper(II) nitrate solution

J. Kim, H. Kang, N. Go, S. Jeong, T. Yim, Y. N. Jo, K. T. Lee and J. Mun, J. Mater. Chem. A, 2017, 5, 24892 DOI: 10.1039/C7TA07232E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements