A study on PVDF-PEO-Li7La2.5Ce0.5Zr1.625Bi0.3O12 solid electrolyte with high ionic conductivity and its application in solid-state batteries

Next Materials Pub Date : 2024-08-31 DOI:10.1016/j.nxmate.2024.100360

Jing Wang , Xin Li , Xinlu Wang , Yang Su , Guixia Liu , Wensheng Yu , Xiangting Dong , Jinxian Wang

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Abstract

Polymer/ceramic composite solid electrolyte is an effective solution for the development of flexible solid-state lithium metal batteries. In this paper, a solid-state lithium-ion electrolyte composed of ceramic powder Li₇La_2.5Ce_0.5Zr_1.625Bi_0.3O₁₂ (LLCZBO) and lithium salt LiTFSI is added to PVDF-PEO. With the addition of 20 wt% LLCZBO, the electrolyte has a high ionic conductivity of 3.67 × 10⁻⁴ S·cm⁻¹ at room temperature. The lithium symmetric battery can be cycled for a long time at a current density of 0.1 mA·cm⁻². The battery with LiNi_0.6Co_0.2Mn_0.2O₂ (NCM) as the cathode can be cycled at room temperature at 0.1 C and obtain high coulombic efficiency. The excellent cycle performance and rate capability can be attributed to the high ionic conductivity of LLCZBO. These advantages indicate that the composite solid electrolyte (CSE) membranes is expected to be a perfect electrolyte for the next generation of solid-state lithium batteries.

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高离子电导率 PVDF-PEO-Li7La2.5Ce0.5Zr1.625Bi0.3O12 固体电解质及其在固态电池中的应用研究

聚合物/陶瓷复合固态电解质是开发柔性固态锂金属电池的有效解决方案。本文在 PVDF-PEO 中加入了由陶瓷粉末 Li7La2.5Ce0.5Zr1.625Bi0.3O12 （LLCZBO）和锂盐 LiTFSI 组成的固态锂离子电解质。加入 20 wt% LLCZBO 后，电解液在室温下的离子电导率高达 3.67 × 10-4 S-cm-1。锂对称电池可以在 0.1 mA-cm-2 的电流密度下长时间循环使用。以 LiNi0.6Co0.2Mn0.2O2（NCM）为正极的电池可在室温 0.1 C 下循环，并获得较高的库仑效率。优异的循环性能和速率能力可归功于 LLCZBO 的高离子导电性。这些优点表明，复合固体电解质（CSE）膜有望成为下一代固态锂电池的理想电解质。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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