Study of nano-TiO2 composite polymer electrolyte incorporating ionic liquid PP12O1TFSI for lithium battery

A series of novel nano-composite polymer electrolytes (NCPEs) are prepared with the ionic liquid of N-methyl-N-methoxyethylpiperidiniumbis(trifluoromethanesulfonyl)imide (PP 12O1 TFSI) as plasticizer and nano-sized TiO 2 as additive. The effect of the ratio of TiO 2 to Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) on the properties of the NCPEs are studied, such as the crystallinity and ionic conductivity . The results indicate that the nano-composite polymer electrolyte NCPE-2, that the ratio of TiO 2 to PVDF-HFP is 10%, exhibits the highest ionic conductivity of 2   ×   10 −   3   S·cm −   1 with the lowest crystallinity. The LiFePO 4 /NCPE-2/Li coin-typed cell cycled at 0.5   C shows the 1st discharge capacity of 127.9   mAh   g −   1 and remains 97.6% of the initial discharge capacity on the 50th cycle.