We describe the impact of center polyether segment dispersity (Đ = M_w/M_n ∼ 1.45) on the ionic conductivities of lithium salt-doped polystyrene-block-poly(oligo(ethylene oxide) carbonate)-block-polystyrene (bSOS) electrolytes with narrow dispersity end blocks. Three bSOS samples with M_n,total = 11.7–23.9 kg/mol were doped with lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) with r = [Li⁺]/[EO units] = 0.09. Small-angle X-ray scattering (SAXS) analyses reveal that these samples with f_O/salt = 0.55–0.60 self-assemble into lamellar morphologies, with ionic conductivities as high as σ = 0.19 mS/cm at 90 °C measured by electrochemical impedance spectroscopy (EIS). The ionic conductivities of LiTFSI-doped bSOS are comparable to those of salt-doped, narrow dispersity nSOS triblocks with M_n ≳ 20 kg/mol, and they are 2–3 times greater than those of the narrow dispersity nSO diblock control samples. These findings are rationalized in terms of decreases in the lamellar grain sizes induced by molecular architecture and segment dispersity, which enhance intergrain connectivity and ion transport.

中文翻译：

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宽分散锂盐掺杂聚苯乙烯/聚（环氧乙烷）三嵌段聚合物的离子电导率

我们描述中心聚醚链段分散度的影响（Đ =中号_瓦特/中号_Ñ〜1.45）上掺杂锂盐聚苯乙烯的离子电导率块-聚（低聚（环氧乙烷）酯） -嵌段-聚苯乙烯（bSOS）电解质具有窄分散性端块。三bSOS样品中号_N，总= 11.7-23.9千克/摩尔被掺杂有锂，双（三氟甲磺酰）亚胺锂（LiTFSI）与[R = [李⁺ ] / [EO单元] = 0.09。小角 X 射线散射 (SAXS) 分析表明这些样品含有f _O/盐= 0.55–0.60 自组装成层状形态，在 90 °C 下通过电化学阻抗谱 (EIS) 测量离子电导率高达 σ = 0.19 mS/cm。的LiTFSI掺杂bSOS的离子电导率是与那些掺杂盐，窄分散度国家统计局三嵌段与中号_Ñ ≳为20kg / mol，并且它们比那些窄分散度NSO二嵌段对照样品的更大的2-3倍。这些发现在由分子结构和片段分散引起的层状晶粒尺寸减小方面得到了合理化，这增强了晶粒间的连通性和离子传输。