摘要
A polysiloxane with linear chain was fabricated. • The adhesion between PET and Al was enhanced by polysiloxane. • Condensed Al films were prepared and its regulation mechanism was revealed. • High-performance composite current collectors for LIBs were fabricated. Composite current collectors (CCCs) are promising for improving the mass energy density and safety characteristics of lithium-ion batteries (LIBs), but are recently challenged by poor combination between polymer matrix and metal layer. In this study, a poly(ethylene terephthalate) (PET) based composite current collector (PET-DMDS basic -Al) was fabricated by constructing a silane coupling agent (KH-560)/ dimethoxydimethylsilane (DMDS) co -hydrolyzed polysiloxane interlayer on the surface of PET, followed by magnetron sputtering of an aluminum (Al) layer, where linear molecular chain were formed in the polysiloxane interlayer under alkaline condition. The results demonstrate that the linear polysiloxane chain contributes to the formation of refined Al crystals, further enabling PET-DMDS basic -Al to exhibit a modulus approximately 300 MPa higher than that of PET-Al current collectors, together with a 3.8-fold increase in elongation at break. In addition, the Al shedding area was reduced from 10.03% for PET-Al to 2.11% for PET-DMDS basic -Al. Owing to the strong adhesion of Al layer on PET brought by linear polysiloxane and Al crystal grains controlled by growth conditions, the modified collectors also show significant improvements in corrosion resistance, thermal stability, and electrochemical performance compared to representative reported works. This study provides an effective interfacial engineering strategy and a practical materials basis to develop PET-based composite current collectors for LIB safety. Download: Download high-res image (147KB) Download: Download full-size image
危险品化学品经营许可证（带存储）