2 research outputs found
Visualization of Si Anode Reactions in Coin-Type Cells via Operando Scanning Electron Microscopy
Understanding
the electrochemical behavior and controlling the morphological variations
of electrodes are critical for the design of high-capacity batteries.
In this article, we describe a newly established operando scanning
electron microscopy (SEM) to visualize the battery reactions in a
modified coin cell, which allowed the simultaneous collection of electrochemical
data and time-resolved images. The investigated silicon (Si)–polyimide-binder
electrode exhibited a high capacity (∼1500 mAh g<sup>–1</sup>) and a desirable cyclability. Operando SEM revealed that the morphology
of the Si anode drastically changed and cracks formed on the electrode
because of the lithiation-induced volume expansion of the Si particles
during the first charge process. Interestingly, the thickness variation
in the Si composite layer was moderated in subsequent cycles. This
strongly suggested that cracking caused by the breakage of the stiff
binder alleviated the internal stress experienced by Si. On the basis
of this finding by the operando SEM technique, patterned Si electrodes
with controlled spacing were successfully fabricated, and their improved
performance was confirmed
Visualization of Si Anode Reactions in Coin-Type Cells via Operando Scanning Electron Microscopy
Understanding
the electrochemical behavior and controlling the morphological variations
of electrodes are critical for the design of high-capacity batteries.
In this article, we describe a newly established operando scanning
electron microscopy (SEM) to visualize the battery reactions in a
modified coin cell, which allowed the simultaneous collection of electrochemical
data and time-resolved images. The investigated silicon (Si)–polyimide-binder
electrode exhibited a high capacity (∼1500 mAh g<sup>–1</sup>) and a desirable cyclability. Operando SEM revealed that the morphology
of the Si anode drastically changed and cracks formed on the electrode
because of the lithiation-induced volume expansion of the Si particles
during the first charge process. Interestingly, the thickness variation
in the Si composite layer was moderated in subsequent cycles. This
strongly suggested that cracking caused by the breakage of the stiff
binder alleviated the internal stress experienced by Si. On the basis
of this finding by the operando SEM technique, patterned Si electrodes
with controlled spacing were successfully fabricated, and their improved
performance was confirmed