Hybrids gel electrolytes with pending polyhedral oligomeric silsesquioxane toward improving interfacial stability for lithium ion batteries

Hybrids gel electrolytes with polyhedral oligomeric silsesquioxane hung on cross-linked networks through chemical bond are designed toward improving interfacial stability for Lithium ion batteries. The corresponding hybrids gel electrolytes deliver an ionic conductivity of 2.25 × 10 –3 S cm −1 , lithium-ion transference number ( t Li + ) of 0.34 at 26 °C and wide electrochemical windows of 5.0 V. The Li/Li symmetric cells with this hybrid gel polymer electrolytes (HGPEs) exhibit excellent long-term stability up to 2000 h at 0.1 mA cm −2 . In particular, the LiFePO 4 /Li cells assembled with HGPEs exhibit good cycling performance and rate capability. The initial discharge capacity of LiFePO 4 /HGPEs-3/Li is 156.6 mAh g −1 at a current rate of 0.1C at 26 °C. The capacity of LiFePO 4 /HGPEs-3/Li after 100 cycles is 131.7 mAh g −1 with a high coulombic efficiency over 99% throughout the whole cycling process. Graphical abstract