cm9b04992_si_001.pdf (2.92 MB)
Porous Metals from Chemical Dealloying for Solid-State Battery Anodes
journal contribution
posted on 2020-03-10, 17:56 authored by Sang Yun Han, John A. Lewis, Pralav P. Shetty, Jared Tippens, David Yeh, Thomas S. Marchese, Matthew T. McDowellAlloy
anodes for lithium-ion batteries feature greater specific
capacity than conventional graphite electrodes and could enable batteries
with higher energy density. However, large volumetric and structural
changes during cycling limit performance. Such transformations are
expected to be particularly problematic in solid-state batteries,
where volume changes can exacerbate chemomechanical degradation of
the all-solid structure. Here, we synthesize porous metal foils with
bicontinuous porosity by chemical dealloying of Li–In and Li–Sn
alloys in dry methanol. Porous indium foils are directly used as the
anode in both solid-state and liquid-electrolyte cells, and they exhibit
improved capacity and cycle life in solid-state batteries compared
to dense indium foil with similar mass loading. Furthermore, capacity
retention with cycling of the porous electrodes is much better in
solid-state cells than in liquid cells. This performance enhancement
is due to improved accommodation of volume changes while minimizing
surface side reactions throughout the porous electrode. These results
highlight the promise of porous metals for solid-state batteries.