Solid electrolytes (SEs) would be an ideal solution to safety concerns, miniaturization and increase of energy density; however, SEs are difficult to have high ionic conductivity and mechanical properties simultaneously. In this work, we firstly synthesize a novel class of ammonium‐based organic ionic plastic crystals (OIPCs), then prepare SE system by blending synthesized OIPC with poly(vinylidenefluoride‐co‐hexafluoropropylene) (P(VDF‐HFP)) and lithium bis(fluorosulfonyl)imide (LiFSI). Such SEs overcome most of the limitations, with attractive ionic conductivity and lithium ion transference number, excellent mechanical properties, high electrochemical stability, as well as satisfactory interfacial stability with lithium metal. In particular, Li/LiFePO₄ cells employing as‐prepared SE exhibit high discharge capacity, favorable cycling and rate performance at 30 °C, which is comparable to those using liquid electrolytes. The reported SE system, combined with excellent overall performance, is expected to have great potential for application in solid‐state lithium ion batteries.

中文翻译：

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具有高离子电导率和机械性能的固态锂离子电池有机离子塑料晶体聚合物固体电解质

固体电解质（SEs）将是解决安全问题，小型化和提高能量密度的理想解决方案；然而，SE很难同时具有高离子电导率和机械性能。在这项工作中，我们首先合成了一类新型的基于铵的有机离子塑料晶体（OIPC），然后通过将合成的OIPC与聚偏二氟乙烯-共-六氟丙烯（P（VDF-HFP））和锂双（氟磺酰基）酰亚胺（LiFSI）。这种SE克服了大多数局限性，具有有吸引力的离子电导率和锂离子转移数，出色的机械性能，高电化学稳定性以及令人满意的与锂金属的界面稳定性。特别是Li / LiFePO ₄使用制备的SE的电池在30°C时表现出高放电容量，良好的循环性能和倍率性能，这与使用液体电解质的电池相当。报道的SE系统结合出色的整体性能，有望在固态锂离子电池中具有巨大的应用潜力。