Self-Assembled Asymmetric Membrane Containing Micron-Size Germanium for High Capacity Lithium Ion Batteries
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.
Byrd, Ian, Hao Chen, Theron Webber, Jianlin Li, Ji Wu.
"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