Issue 48, 2018

Supercritical CO2-assisted synthesis of 3D porous SiOC/Se cathode for ultrahigh areal capacity and long cycle life Li–Se batteries

Abstract

The commercial application of lithium–selenium (Li–Se) batteries is hampered by low areal capacity, inferior cycling stability and low utilization of Se, in particular at a high Se loading. Here, a facile biotemplating method with the assistance of a supercritical CO2 (SC–CO2) technique has been developed to construct a unique 3D porous SiOC/Se cathode with a high Se loading for Li–Se batteries with high areal capacity and a long cycling life. An SiOC/Se cathode derived from rice husks achieved an extremely high initial areal capacity of 8.1 mA h cm−2 at 0.1C at an Se loading of 8 mg cm−2, which is the highest Se loading reported thus far. After 200 cycles, the reversible areal capacity remained at 4.1 mA h cm−2 together with a capacity retention of 90% (vs. 4.8 mA h cm−2 in the 2nd cycle). This excellent performance at a record-breaking Se loading in comparison with earlier Li–Se batteries is attributed to the unique 3D porous conductive network and Si–O–C units set in the porous carbon matrix, which provided continuous electron/ion pathways, enhanced structural stability and strong chemical adsorption for trapping Se and Li2Se, as well as the uniform distribution of Se infiltrated via the SC–CO2 strategy. This cathode with an ultrahigh Se loading is strongly expected to pave the way for the practical implementation of Li–Se batteries with a high energy density in large-scale energy storage systems.

Graphical abstract: Supercritical CO2-assisted synthesis of 3D porous SiOC/Se cathode for ultrahigh areal capacity and long cycle life Li–Se batteries

Supplementary files

Article information

Article type
Paper
Submitted
10 Okt. 2018
Accepted
14 Nov. 2018
First published
14 Nov. 2018

J. Mater. Chem. A, 2018,6, 24773-24782

Supercritical CO2-assisted synthesis of 3D porous SiOC/Se cathode for ultrahigh areal capacity and long cycle life Li–Se batteries

R. Fang, Y. Xia, C. Liang, X. He, H. Huang, Y. Gan, J. Zhang, X. Tao and W. Zhang, J. Mater. Chem. A, 2018, 6, 24773 DOI: 10.1039/C8TA09758E

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