多層β相高分子靜電奈米纖維應用於固態鋰離子電池

Application of Multilayer β-phase Polymer Electrostatic Nanofibers to Solid-state Lithium-ion Batteries

鍾沛璇(P. H. Chung) ； 李文亞(W. Y. Lee)

《紡織綜合研究期刊》 32卷4期 (2022/10) Pp. 25-30

https://doi.org/10.6439/TTRJ.202210_32(4).0005

摘要

由靜電奈米紡絲製作多層結構之β相PVDF-HFP應用於固態鋰離子電解質。在多層紡織結構中夾入PEO/LiTFSI組成之主要電解質，並透過β相PVDF-HFP紡絲層的高極性分子排列，有助於鋰離子電解質中之離子傳輸，大幅提升離子傳導度，為全固態電解質帶來偌大的益處。而PVDF-HFP奈米紡絲層提供了良好的機械性質，拉伸程度可遠大於主要電解質2000%。然而β相PVDF-HFP紡絲層在陰陽極界面處，扮演了緩衝作用，進而抑制了鋰枝晶形成反應，有效提升電池的循環穩定性。最後電池測試中，在0.1C循環充放電下超過1600小時，其比電容仍維持80%，以上為本研究提供一種用於高性能全固態鋰離子電池的固態電解質之設計及應用。

關鍵字

靜電紡絲 ； PVDF-HFP ； 全固態電解質 ； 鋰離子電池

並列摘要

The β-phase PVDF-HFP with multilayer structure made by electrospinning is used in solid-state lithium-ion electrolyte. The main electrolyte composed of PEO/LiTFSI is sandwiched in the multilayer structure. The arrangement of the highly polar molecules through the β-phase PVDF-HFP spinning layer helps the ion transmission in the lithium-ion electrolyte and greatly enhances the ionic conductivity. The PVDF-HFP electron-spun layer provides great mechanical properties. However, the β-phase PVDF-HFP spinning layer acts as a buffer layer at the anode and cathode interface, hence inhibiting the formation of lithium dendrites and effectively improving the cycle stability of the battery. Finally, in the battery test, the specific capacitance retained 80% at 0.1C charge/discharge cycling for more than 1600 hours. This work provides a novel strategy of a solid electrolyte for high-performance all-solid-state lithium-ion batteries for this study.

並列關鍵字

Electrospun-fibers ； PVDF-HFP ； All-solid-state electrolyte ； Lithium-ion battery