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Structure–property study of cross-linked hydrocarbon/poly(ethylene oxide) electrolytes with superior conductivity and dendrite resistance

机译:具有优异电导率和耐枝晶腐蚀性能的交联烃/聚环氧乙烷电解质的结构性质研究

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摘要

Lithium dendrite growth is a fundamental problem that precludes the practical use of lithium metal batteries. Solid polymer electrolytes (SPEs) have been widely studied to resist the growth of lithium dendrites but the underlying mechanisms are still unclear. Most SPEs sacrifice high ionic conductivities for increased dendrite suppression performance by using components with high mechanical stiffness. We report a class of cross-linked hydrocarbon/poly(ethylene oxide) SPEs with both high ionic conductivities (approaching 1 × 10–3 S cm–1 at 25 °C) and superior dendrite suppression characteristics. A systematic structure–property study shows that the crystallinity of the hydrocarbon backbones plays a key role in regulating size and morphology of lithium dendrites, as well as the ability to suppress their growth.
机译:锂树枝状晶体的生长是一个基本问题,妨碍了锂金属电池的实际使用。固态聚合物电解质(SPE)已被广泛研究以抵抗锂树枝状晶体的生长,但其潜在机理仍不清楚。大多数SPE通过使用具有高机械刚度的组件来牺牲高离子电导率,以提高枝晶抑制性能。我们报告了一类具有高离子电导率(在25°C下接近1×10 –3 S cm –1 )的交联烃/聚环氧乙烷SPE )和出色的枝晶抑制特性。一项系统的结构性质研究表明,烃主链的结晶度在调节锂枝晶的大小和形态以及抑制其生长的能力方面起着关键作用。

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