4.7 Article

Disulfide Metathesis-Assisted Lithium-Ion Conduction for PEO-Based Polymer Electrolytes

期刊

ACS MACRO LETTERS
卷 11, 期 8, 页码 991-998

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.2c00404

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资金

  1. National Natural Science Foundation of China [51973073]
  2. Innovation and Talent Recruitment Base of New Energy Chemistry and Device [B21003]
  3. Analysis and Testing Center of HUST

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Disulfide metathesis is a promising strategy for improving the self-healing ability of polymer electrolytes (PEs). However, the enhancement effects on the ionic conductivities of PEs are generally overlooked when introducing a dynamic covalent bond. In this study, a disulfide-containing additive was synthesized and found to significantly enhance the ionic conductivity of PEs through the dynamic exchange strategy of the disulfide bond.
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 x 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.

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