Herein, we report the enhanced electrochemical performance of a solid-state cell realized through an engineered solid electrolyte-cathode interface via a simple casting technique. The ceramic-in-polymer solid electrolyte sample with 15 wt% NASICON-type LiSnZrAl(PO) ceramic filler in a P(VDF-HFP) matrix (CPSE15) showed the highest room temperature conductivity of ∼1.1 × 10 S cm and lithium-ion transference number of ∼0.60. The symmetric Li|CPSE15|Li cell showed a consistent voltage profile with an over-potential of ∼45 mV for 750 h at a current density of 0.1 mA cm. CPSE15 slurry was directly cast onto the LiFePO (LFP) cathode layer using a doctor-blade coating method to obtain a cathode-electrolyte assembly. Subsequently, a full cell fabricated using this assembly and lithium metal delivered an initial discharge capacity of ∼157 mAh g at 0.2C. Further, the cell exhibited ∼90 mAh g discharge capacity at 1C and sustained 500 charge-discharge cycles at room temperature. The engineered interface in cathode-electrolyte assembly enabled this cell to outperform its conventionally fabricated counterpart with a stacked LFP cathode sheet and freestanding CPSE15 electrolyte membrane, which was attributed to a lower interfacial resistance (∼51%) of the former.

中文翻译：

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通过简单的固体电解质-阴极界面设计提高固态锂电池的室温性能

在此，我们报告了通过简单的铸造技术通过工程固体电解质-阴极界面实现的固态电池的增强电化学性能。 P(VDF-HFP) 基体中含有 15 wt% NASICON 型 LiSnZrAl(PO) 陶瓷填料的聚合物陶瓷固体电解质样品 (CPSE15) 显示出最高的室温电导率，约为 1.1 × 10 S cm，并且锂-离子迁移数~0.60。对称的 Li|CPSE15|Li 电池在 0.1 mA cm 的电流密度下表现出一致的电压分布，750 小时内过电势为 ∼45 mV。采用刮刀涂布法将CPSE15浆料直接浇注到LiFePO（LFP）正极层上，得到正极-电解质组件。随后，使用该组件和锂金属制造的全电池在 0.2C 下的初始放电容量为 ∼157 mAh g。此外，该电池在 1C 下表现出约 90 mAh g 的放电容量，并在室温下持续 500 次充放电循环。阴极-电解质组件中的工程界面使该电池的性能优于采用堆叠式 LFP 阴极片和独立式 CPSE15 电解质膜的传统制造电池，这归因于前者的界面电阻较低（约 51%）。