We will discuss solid polymer electrolytes (SPEs) based on a poly(ethylene glycol)-in-Li triflate material that contains an organic-inorganic composite (OIC) in which boron species are incorporated into a silica network. We demonstrate that the Lewis acid tricoordinate boron sites formed in OIC have stronger interaction with triflate anions than silica sites, resulting in enhanced lithium ion conductivity and Li transference numbers at optimal boron concentrations. The SPE sample prepared with 10 mol. % TEB in OIC exhibited a conductivity of 4.3 10-5 S/cm and a Li transference number of 0.89, which represents nearly single-ion conductor behaviour. We also studied the influence of an ionic liquid (IL) addition, the IL structure and the amount, on properties of these composite SPEs. We demonstrate an increase of the SPE conductivity by two orders of magnitude for 30 wt.% of the IL in SPE.

Composite polymer electrolytes for lithium ion batteries which contain tricoordinate boron for enhanced conductivity and transference numbers

246th National Meeting (2013)

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