Solid polymer electrolytes based on polystyrene‐polyether block copolymers having branched ether structure

To obtain solid polymer electrolytes (SPEs) having high ionic conductivity together with mechanical integrity, we have synthesized polystyrene (PSt)‐polyether (PE) diblock copolymers via one‐pot anionic polymerization. The PSt block is expected to aggregate to act as hard fillers in the SPE to enhan...

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Bibliographic Details
Published inPolymers for advanced technologies Vol. 30; no. 3; pp. 736 - 742
Main Authors Kokubo, Hisashi, Nakazawa, Eiji, Watanabe, Masayoshi
Format Journal Article
LanguageEnglish
Published Bognor Regis Wiley Subscription Services, Inc 01.03.2019
Subjects
Anionic polymerization
block copolymer
Block copolymers
Chemical synthesis
Electrolytes
Ethylene oxide
Fillers
Ion currents
Ion transport
Ions
Lithium
Molten salt electrolytes
one‐pot living anionic polymerization
Polyethylenes
Polystyrene resins
Solid electrolytes
solid polymer electrolytes
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Summary:To obtain solid polymer electrolytes (SPEs) having high ionic conductivity together with mechanical integrity, we have synthesized polystyrene (PSt)‐polyether (PE) diblock copolymers via one‐pot anionic polymerization. The PSt block is expected to aggregate to act as hard fillers in the SPE to enhance the mechanical property. The PE block consists of random copolymer (P(EO‐r‐MEEGE)) of ethylene oxide (EO) and 2‐(2‐methoxyethoxy) ethyl glycidyl ether (MEEGE) in different molar ratios ([EO]/[MEEGE] = 100/0, 86/14, 75/25, 68/32, and 41/59). The introduction of the MEEGE moiety in PEO reduced the crystallinity of PEO, and the fast motion of the MEEGE side chain caused plasticization of the PE block, thereby contributing to the fast ion transport. SPEs were fabricated by mixing the obtained diblock copolymer (PSEx) and lithium bis(trifluoromethanesulfonyl) amide (LiTFSA) with [Li]/[O] = 0.05. Ionic conductivity of the obtained SPEs was dependent on the molar ratio of EO in the PE block (x) as well as the weight fraction of PE block (fPE) in the block copolymer. PSE0.86 (fPE = 0.65) exhibited high ionic conductivity (3.3 × 10−5 S cm−1 at 30°C; 1.1 × 10−4 S cm−1 at 60°C) comparable with that of P(EO‐r‐MEEGE) (PE0.85; fPE = 1.00) (9.8 × 10−5 S cm−1 at 30°C; 4.0 × 10−4 S cm−1 at 60°C).
ISSN:1042-7147
1099-1581
DOI:10.1002/pat.4511