Leslie J. Lyons

Synthesis and characterization of alkylsilane ethers with oligo(ethylene oxide) substituents for safe electrolytes in lithium-ion batteries

Alkylsilane ethers, containing one or three carbon spacer groups between the silicon atom and oligo(ethylene oxide) moiety, were designed and synthesized. These compounds are non-hydrolyzable and less flammable than their alkoxysilane counterparts. A full cell test using them as electrolyte solvents showed good cycling performance in lithium-ion batteries.

Novel siloxane polymers as polymer electrolytes for high energy density lithium batteries

A variety of disubstituted (double-comb) polysiloxane polymers have been prepared containing linear, branched, and cyclic oligoethyleneoxide units, –(OCH2CH2)n–, in the side chains and as part of the siloxane backbone. Copolymers, using mixtures of linear ethylene oxide side chains, were also synthesized. These polymers were doped with LiN(SO2CF3)2 (LiTFSI, 1) and conductivities of the polymer-salt complexes were determined as a function of temperature and doping level. The maximum conductivity of these polymers at 25 ° C was 2.99 ×10−4, for a copolymer containing equimolar amounts of side chains with n = 5 and 6.

Polymer electrolytes based on polysilane comb polymers

Abstract Polysilane comb polymers, which incorporate ethoxyethoxybutane in the side chain of the polymer, have been used as polymer electrolyte hosts. The polysilane polymers solubilize lithium triflate, allowing polymer electrolytes of a range of compositions to be prepared and studied. [(CH 3 CH 2 OCH 2 CH 2 O(CH 2 ) 4 )Si(CH 3 )] n containing lithium triflate at a concentration of four oxygens per lithium cation has a room temperature ionic conductivity of 1.2 × 10 −7 S cm −1 .