Perpustakaan Digital ITB

High-voltage electrode materials are beneficial fordeveloping high-power-density lithium-ion batteries. The anodicvoltage stability of electrolytes is a major challenge for high-voltagelithium batteries. Herein, a polysiloxane-based solid polymer electro-lyte is fabricated by grafting ionic liquid and poly(ethylene oxide)chains ontoflexible polysiloxane backbone. An ionic liquid with astrong electron-withdrawing nitrile group and a positively chargedimidazole possesses good resistance against anodic oxidation, whichendows the solid polymer electrolyte with a wide electrochemicalwindow. The electrolyte integrates advantages of ionic liquid andpoly(ethylene oxide) exhibiting a high ionic conductivity (3.56×10?4Scm?1at room temperature) and excellent resistance to dendritegrowth. In addition, both Li/LiFePO4and high-voltage Li/LiNi0.5Mn1.5O4cells with the as-prepared solid polymer electrolyteshow excellent cycling performance and superior rate capability at 30°C. Thus, the modified polysiloxane-based electrolyte is apromising electrolyte candidate for next-generation high-energy-density batteries