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La₂O₃ 用填充剂稳定聚合物电解质中的剩余溶剂,用于先进的固态金属电池

Yaping Zeng¹, Le Zhao¹, Jiaming Zhang¹

¹Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical Engineering Central South University Changsha 410083 P. R. China.

|April 11, 2025

概括

这项研究引入了La2O3纳米粒子,以改善聚乙烯化物-co-hexafluoropropylene (PVDF-HFP) 聚合物电解质,用于更安全的金属固态电池 (SSB). 复合材料增强了稳定性和离子导电性,克服了残留溶剂的问题.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
聚合物科学聚合物科学

背景情况:

聚合物固体电解质 (SE) 对于先进的金属固态电池 (SSB) 是非常重要的,因为它们的安全性和灵活性.
聚乙烯化物-co-hexafluoropropylene (PVDF-HFP) SEs提供高介电常数,离子导电性和灵活性.
在PVDF-HFP SE中剩余的N,N-二甲基形式胺 (DMF) 溶剂会引起界面副作用,限制SSB的周期寿命.

研究的目的:

为金属固态电池开发一种稳定且高导电性的复合聚合物电解质.
解决基于PVDF-HFP的SEs中残留DMF引起的界面副作用.
提高基于PVDF-HFP的固态电池的电化学性能和循环寿命.

主要方法:

将La2O3纳米颗粒作为无机填充剂纳入PVDF-HFP/LiFSI聚合物电解质矩阵.
形成一个PVDF-HFP/La2O3复合聚合物电解质 (CPE) 含有40 wt%的La2O3.
开发的CPE的离子导电性,离子转移数和接口特性.

主要成果:

由于La2O3和DMF分子之间的相互作用,PVDF-HFP/La2O3 CPE显著改善了细胞循环稳定性.
含有40%重量%的La2O3的复合电解质在25°C时达到1.33 × 10^-3 S cm^-1的高离子导电率.
PVDF-HFP/La2O3 CPE表现出更高的离子转移数 (0.52) 和降低的极化,表明性能提高.

结论:

2O3纳米粒子有效地减轻了PVDF-HFP固态电池的副作用,并提高了基于PVDF-HFP固态电池的界面稳定性.
开发的PVDF-HFP/La2O3复合聚合物电解质为高性能和安全的金属固态电池提供了有前途的解决方案.
该研究强调了像La2O3这样的无机填充剂在推进下一代能源存储的聚合物固体电解质技术方面的潜力.

关键词:

在La2O3填充剂中使用.N,N-二甲基形式胺基复合电解质是一种复合电解质.离子导电性的离子导电性.金属固态电池金属固态电池

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