2024-08-27 オークリッジ国立研究所(ORNL)
＜関連情報＞
- https://www.ornl.gov/news/researchers-demystify-polymer-binders-pave-way-better-sulfide-solid-state-electrolyte
- https://pubs.acs.org/doi/abs/10.1021/acsenergylett.3c02813
自立型硫化物固体電解質膜におけるポリマーバインダーの絡み合いを解明 Elucidating Polymer Binder Entanglement in Freestanding Sulfide Solid-State Electrolyte Membranes
Anna Mills,Sergiy Kalnaus,Wan-Yu Tsai,Yi-Feng Su,Ella Williams,Xueli Zheng,Swetha Vaidyanathan,Daniel T. Hallinan Jr.,Jagjit Nanda,Guang Yang
ACS Energy Letters Published: May 10, 2024
DOI:https://doi.org/10.1021/acsenergylett.3c02813
Abstract
This study advances the development of flexible, sheet-type sulfide solid-state electrolytes (SSEs) for use in all-solid-state batteries, emphasizing the important and previously insufficiently investigated role of polymer binder entanglement. The molecular weight of polymer binders is pivotal in crafting robust, freestanding SSE films. Our research uncovers a dual impact: higher molecular weight binders bolster the structural integrity of SSE films but elevate grain boundary resistance and diminish critical current density, whereas lower molecular weight poly(isobutylene) films, despite their more uniform distribution, lack the essential strain hardening or strength for sustained active material contact. Crucially, full cells employing higher molecular weight binders demonstrate improved discharge capacity retention, contrasting sharply with the notable capacity degradation in lower molecular weight cells. Our findings not only deepen the comprehension of binder influences in solid-state batteries but also chart a course for refining all-solid-state battery technologies, a key stride for the future of energy storage solutions.
