Abstract
We report network defect-controlled ion gels fabricated from two key materials: tetra-arm poly(ethylene glycol) (TetraPEG) prepolymers and a lithium (Li) salt/ionic liquid (IL) electrolyte. The resulting TetraPEG ion gels exhibited higher ionic conductivity than the corresponding IL solution, and the network defects in the gels strongly affected the electrode reaction (Li-ion insertion/desertion reaction at the graphite negative electrode). Specifically, the charge/discharge capacities increased linearly with the proportion of network defects.
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