The lignin derived ultrathin all-solid composite polymer electrolyte (CPE) with a thickness of only 13.2 µm, which possess 3D nanofiber ionic bridge networks composed of single-ion lignin-based lithium salt (L-Li) and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) as the framework, and poly(ethylene oxide)/lithium bis(trifluoromethanesulfonyl)imide (PEO/LiTFSI) as the filler, is obtained through electrospinning/spraying and hot-pressing. t. The Li-symmetric cell assembled with the CPE can stably cycle more than 6000 h under 0.5 mA cm⁻² with little Li dendrites growth. Moreover, the assembled Li||CPE||LiFePO₄ cells can stably cycle over 700 cycles at 0.2 C with a super high initial discharge capacity of 158.5 mAh g⁻¹ at room temperature, and a favorable capacity of 123 mAh g⁻¹ at −20 °C for 250 cycles. The excellent electrochemical performance is mainly attributed to the reason that the nanofiber ionic bridge network can afford uniformly dispersed single-ion L-Li through electrospinning, which synergizes with the LiTFSI well dispersed in PEO to form abundant and efficient 3D Li⁺ transfer channels. The ultrathin CPE induces uniform deposition of Li⁺ at the interface, and effectively inhibit the lithium dendrites. This work provides a promising strategy to achieve ultrathin biobased electrolytes for solid-state lithium ion batteries.

中文翻译：

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用于高性能锂电池的具有 3D 单离子纳米纤维离子桥框架的木质素衍生超薄全固体聚合物电解质

厚度仅为13.2微米的木质素衍生超薄全固体复合聚合物电解质（CPE），具有由单离子木质素基锂盐（L-Li）和聚偏二氟乙烯组成的3D纳米纤维离子桥网络以聚环氧乙烷/双(三氟甲磺酰)亚胺锂(PEO/LiTFSI)为填料，通过静电纺丝/喷涂、热压得到。 t。用CPE组装的锂对称电池可以在0.5 mA cm ^-2下稳定循环超过6000小时，并且几乎没有锂枝晶生长。此外，组装的Li||CPE||LiFePO ₄电池可以在0.2 C下稳定循环700次以上，并具有室温下158.5 mAh g ^-1的超高首次放电容量和室温下123 mAh g ^-1的良好容量。 −20 °C 250 个循环。优异的电化学性能主要归因于纳米纤维离子桥网络可以通过静电纺丝提供均匀分散的单离子L-Li，与PEO中良好分散的LiTFSI协同形成丰富且高效的3D Li ⁺传输通道。超薄CPE诱导Li ⁺在界面处均匀沉积，并有效抑制锂枝晶。这项工作为实现固态锂离子电池的超薄生物基电解质提供了一种有前途的策略。