Two-dimensional silica-modified polyethylene oxide solid polymer electrolyte to enhance the performance of lithium-ion batteries
Herein,the positively charged two-dimensional(2D)porous silica(PSN+)nanosheet was obtained by mod-ifying the 2D silica obtained from acid-etched 2D vermiculite,and then the PSN+was used as the filler of polyethyl-ene oxide(PEO)-based solid polymer electrolytes(SPEs).Given the abundant positive charges,PSN+effectively binds with the anions dissociated from lithium salts,thereby promoting lithium-ion transport and achieving a decent lithium-ion transference number.At 50 ℃,the PSN+-based SPEs demonstrated a higher ionic conductivity of 7.5× 10-5 S·cm-1,lithium-ion transference number of 0.30,and a stable voltage window of 4.41 V.Consequently,the as-assembled LiFePO4ⅡLi batteries delivered excellent initial discharge specific capacity of 155.7 mAh·g-1 at 0.2C with 97.1％capacity retention after 100 cycles at 50 ℃.
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