Three-Dimensionally Aligned Sulfur Electrodes by Directional Freeze Tape Casting

Three-Dimensionally Aligned Sulfur Electrodes by Directional Freeze Tape Casting

TitleThree-Dimensionally Aligned Sulfur Electrodes by Directional Freeze Tape Casting
Publication TypeJournal Article
Year of Publication2019
AuthorsYoon Hwa, Eongyu Yi, Hao Shen, Younghoon Sung, Jiawei Kou, Kai Chen, Dilworth Y Parkinson, Marca M Doeff, Elton J Cairns
JournalNano Letters
Volume19
Issue7
Pagination4731 - 4737
Date Published06/2019
ISSN1530-6984
Abstract

Rational design of sulfur electrodes is exceptionally important in enabling a high-performance lithium/sulfur cell. Constructing a continuous pore structure of the sulfur electrode that enables facile lithium ion transport into the electrode and mitigates the reconstruction of sulfur is a key factor for enhancing the electrochemical performance. Here, we report a three-dimensionally (3D) aligned sulfur electrode cast onto conventional aluminum foil by directional freeze tape casting. The 3D aligned sulfur–graphene oxide (S–GO) electrode consisting of few micron thick S–GO layers with 10–20 μm interlayer spacings demonstrates significant improvement in the performance of the Li/S cell. Moreover, the freeze tape cast graphene oxide electrode exhibits homogeneous reconfiguration behavior in the polysulfide catholyte cell tests and demonstrated extended cycling capability with only 4% decay of the specific capacity over 200 cycles. This work emphasizes the critical importance of proper structural design for sulfur–carbonaceous composite electrodes.

DOI10.1021/acs.nanolett.9b01805
Short TitleNano Lett.
Refereed DesignationRefereed