abstrakti:
Sodium
(Na)-ion batteries offer an attractive option for low cost grid scale storage
due to the abundance of Na. Tin (Sn) is touted as a high capacity anode for
Na-ion batteries with a high theoretical capacity of 847 mAh/g, but it has
several limitations such as large volume expansion with cycling, slow kinetics,
and unstable solid electrolyte interphase (SEI) formation. In this article, we
demonstrate that an anode consisting of a Sn thin film deposited on a
hierarchical wood fiber substrate simultaneously addresses all the challenges
associated with Sn anodes. The soft nature of wood fibers effectively releases
the mechanical stresses associated with the sodiation process, and the
mesoporous structure functions as an electrolyte reservoir that allows for ion
transport through the outer and inner surface of the fiber. These properties
are confirmed experimentally and computationally. A stable cycling performance
of 400 cycles with an initial capacity of 339 mAh/g is demonstrated; a
significant improvement over other reported Sn nanostructures. The soft and
mesoporous wood fiber substrate can be utilized as a new platform for low cost
Na-ion batteries.
Keywords:
Na-ion battery anode; Sn nanostructures; wood fibers; mechanical buffer;ion diffusion
Tarkempaa tietoa saat netistä haulla: wooden battery University of Maryland
