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Title: Self-assembled asymmetric membrane containing micron-size germanium for high capacity lithium ion batteries

Journal Article · · RSC Advances
DOI:https://doi.org/10.1039/C5RA19208K· OSTI ID:1265847
 [1];  [1];  [1];  [2];  [1]
  1. Georgia Southern Univ., Statesboro, GA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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-1 after 100 cycles with excellent rate performance. Such a high retention rate has rarely been seen for pristine micron-size germanium anodes. Moreover, 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. Finally, these porous membrane electrodes can be manufactured in large scale using a roll-to-roll processing method.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1265847
Journal Information:
RSC Advances, Vol. 5, Issue 113; ISSN 2046-2069
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Cited By (3)

Etching Asymmetric Germanium Membranes with Hydrogen Peroxide for High‐Capacity Lithium‐Ion Battery Anodes journal January 2020
Toward Low-Cost, High-Energy Density, and High-Power Density Lithium-Ion Batteries journal June 2017
Etching Asymmetric Germanium Membranes with Hydrogen Peroxide for High‐Capacity Lithium‐Ion Battery Anodes journal January 2020

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