2026-03-26 産業技術総合研究所
＜関連情報＞
- https://www.aist.go.jp/aist_j/press_release/pr2026/pr20260326/pr20260326.html
- https://www.sciencedirect.com/science/article/pii/S138824812600038X
光透過性超薄型電極を用いた、プレス成形密閉型電池セル内部におけるリチウム金属析出および剥離の直接可視化 Direct operand visualization of Li-metal plating and stripping inside pressed, closed battery cells using optically transmitting ultra-thin electrode
Mitsunori Kitta, Hikaru Sano, Yuta Maeyoshi
Electrochemistry Communications Available online: 5 March 2026
DOI:https://doi.org/10.1016/j.elecom.2026.108142
Highlights
- Optically transmitting ultra-thin Cu electrode was developed for transparent cell.
- Li plating/stripping at pressed interface was visualized without destruction.
- Gas evolution was captured in real-time by operand transparent observation.
- Gas evolution on electrode surface disturbs Li metal nucleation and growth.
- Different cell properties derived from electrolytes visually explained.
Abstract
Although the electrochemical reactions inside battery cells form the foundation of various energy storage and conversion processes, they are invisible because the electrodes facing the separator are pressed and closed in the cell. In this study, an optically transmitting ultra-thin Cu electrode was developed and the Li-metal plating/stripping behaviors inside cells, where a pressed planar interface existed between the electrodes and the electrolyte-soaked separator, were observed. Gas evolution at the pressed interface strongly disturbed the Li-metal plating, leading to a porous Li-metal plating morphology and unstable cycling with low Coulombic efficiency. Visual inspection of the pressed interface reveals certain underlying mechanisms of Li-metal plating including the influence of gas evolution, which are not readily captured by indirect approaches, while offering a general framework applicable to various other devices based on closed-cell configurations.
