1 research outputs found
Electrochemically Induced Shape-Memory Behavior of Si Nanopillar-Patterned Electrode for Li Ion Batteries
A nanopillar-patterned Si substrate
was fabricated by photolithography,
and its potential as an anode material for Li ion secondary batteries
was investigated. The Si nanopillar electrode showed a capacity of
∼3000 mAh g<sup>–1</sup> during 100 charging/discharging
cycles, with 98.3% capacity retention, and it was revealed that the
nanopillars underwent delithiation via a process similar to shape-memory
behavior. Despite the tensile stress and structural fractures resulting
from repeated lithiation, the nanoscale size and residual crystalline
tip of the pillar (influenced by the bulk crystalline Si base) enabled
recrystallization and transformation into a single-crystalline phase.
To the best of our knowledge, this observation of shape memory recrystallization
mechanism observation was not reported before for Si used as the active
material in Li ion battery applications; these findings are expected
to provide new insights into electrode materials for rechargeable
batteries