Solid-state lithium-metal batteries have great potential to simultaneously achieve high safety and high energy density for energy storage. However, the low ionic conductivity of the solid electrolyte and large electrode/electrolyte interfacial impedance are bottlenecks. A composite solid electrolyte (CSE) that integrates electrospun Li_0.33La_0.557TiO₃ (LLTO) nanofibers, poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is fabricated in this work. The effects of the LLTO filler fraction and morphology (spherical vs fibrous) on CSE conductivity are examined. Additionally, a fluorine-rich interlayer based on succinonitrile, fluoroethylene carbonate, and LiTFSI, denoted as succinonitrile interlayer (SNI), is developed to reduce the large interfacial impedance. The use of SNI rather than a conventional ester-based interlayer (EBI) effectively decreases the Li//CSE interfacial resistance and suppresses unfavorable interfacial side reactions. The LiF- and CF_x-rich solid electrolyte interphase (SEI), derived from SNI, on the Li metal electrode, mitigates the accumulation of dead Li and excessive SEI. Importantly, dehydrofluorination reactions of PVDF-HFP are significantly reduced by the introduction of SNI. A symmetric Li//CSE//Li cell with SNI exhibits a much longer cycle life than that of an EBI counterpart. A Li//CSE@SNI//LiFePO₄ cell shows specific capacities of 150 and 112 mAh g^–1 at 0.1 and 2 C (based on LiFePO₄), respectively. After 100 charge–discharge cycles, 98% of the initial capacity is retained.

中文翻译：

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富氟丁二腈夹层抑制准固态锂金属电池用 Li0.33La0.557TiO3-纳米纤维分散聚（偏二氟乙烯-共-六氟丙烯）电解质的脱氟化氢反应

固态锂金属电池在储能方面具有同时实现高安全性和高能量密度的巨大潜力。然而，固体电解质的低离子电导率和大的电极/电解质界面阻抗是瓶颈。_{集成电纺 Li 0.33} La _0.557 TiO ₃的复合固体电解质 (CSE)(LLTO) 纳米纤维、聚（偏二氟乙烯-co-六氟丙烯）(PVDF-HFP) 和锂双（三氟甲磺酰基）酰亚胺 (LiTFSI) 在这项工作中制造。研究了 LLTO 填料分数和形态（球形与纤维状）对 CSE 电导率的影响。此外，开发了一种基于琥珀腈、氟代碳酸亚乙酯和 LiTFSI 的富氟中间层，称为琥珀腈中间层 (SNI)，以降低大的界面阻抗。使用 SNI 而不是传统的酯基中间层 (EBI) 可有效降低 Li//CSE 界面电阻并抑制不利的界面副反应。LiF- 和 CF _x锂金属电极上源自 SNI 的富固体电解质界面 (SEI) 可减轻死锂和过量 SEI 的积累。重要的是，通过引入 SNI，PVDF-HFP 的脱氟化氢反应显着减少。具有 SNI 的对称 Li//CSE//Li 电池表现出比 EBI 对应物更长的循环寿命。Li//CSE@SNI//LiFePO ₄电池在 0.1 C 和 2 C（基于 LiFePO ₄）下的比容量分别为 150 和 112 mAh g ^{–1 。}经过 100 次充放电循环后，98% 的初始容量得以保留。