The disulfide metathesis is a promising candidate in the dynamically exchanged strategy for improving the self-healing ability of polymer electrolytes (PEs). However, the enhancement effects on the ionic conductivities of PEs are generally ignored while introducing a dynamic covalent bond to PEs. Herein, the oligo(ethylene oxide)-based additive containing a disulfide bond (S−S additive) was synthesized via Michael addition reaction of cystamine and poly(ethylene glycol) methyl ether acrylate (PEGA). Short PEG chains complexed with Li + in a S−S additive migrated rapidly in PEs because of the dynamically exchanged strategy of the disulfide bond. Moreover, disulfide bonds in a S−S additive possessed the ability to exchange with the cross-linked network containing disulfide bonds (S−S net). The as-prepared PEs exhibited a high room temperature ionic conductivity of 1.24 × 10 −4 S cm −1 , demonstrating that the disulfide metathesis-assisted Li + conduction was feasible for enhancing ionic conductivities of PEs. Relative to other PEO-based PEs, these disulfide-containing PEs possessed a high Li + transference number (0.54). Furthermore, the lithium-metal batteries (LMBs) assembled with PEs in the presence of a S−S additive presented stable cycle performance, indicating the promising potential of these PEs as candidates for next-generation LMBs.
In order to improve the ability to confronting the deformation and fracture damage of polymer electrolytes, thus providing high safety for flexible batteries, solid-state polymer electrolytes with both self-healing and...
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