Self-Assembled Asymmetric Membrane Containing Micron-Size Germanium for High Capacity Lithium Ion Batteries

Authors

Ian Byrd, Georgia Southern UniversityFollow
Hao Chen, Georgia Southern UniversityFollow
Theron Webber, Georgia Southern University
Jianlin Li, Oak Ridge National LaboratoryFollow
Ji Wu, Georgia Southern UniversityFollow

Document Type

Article

Publication Date

10-23-2015

Publication Title

RSC Advances

DOI

10.1039/C5RA19208K

ISSN

2046-2069

Abstract

Here we report the formation of novel asymmetric membrane electrode containing micron-size (∼5 μm) germanium powders through a self-assembly phase inversion method for high capacity lithium ion battery anode. 850 mA h g⁻¹ capacity (70%) can be retained at a current density of 600 mA g⁻¹after 100 cycles with excellent rate performance. Such a high retention rate has rarely been seen for pristine micron-size germanium anodes. Scanning electron microscope studies reveal that germanium powders are uniformly embedded in a networking porous structure consisting of both nanopores and macropores. It is believed that such a unique porous structure can efficiently accommodate the ∼260% volume change during germanium alloying and de-alloying process, resulting in an enhanced cycling performance. These porous membrane electrodes can be manufactured in large scale using a roll-to-roll processing method.

Recommended Citation

Byrd, Ian, Hao Chen, Theron Webber, Jianlin Li, Ji Wu. 2015. "Self-Assembled Asymmetric Membrane Containing Micron-Size Germanium for High Capacity Lithium Ion Batteries." RSC Advances, 5 (115): 92878-92884. doi: 10.1039/C5RA19208K source: https://pubs.rsc.org/en/content/articlelanding/2015/RA/C5RA19208K#!divAbstract
https://digitalcommons.georgiasouthern.edu/chem-facpubs/75