Ionic liquid derived Li6.4La3Zr1.4Ta0.6O12/polyethylene oxide solid electrolyte for high stable lithium metal batteries

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-05-07 DOI:10.1016/j.jallcom.2025.180825

Zhiang Li , Shuai Liu , Hao Xu , Fan Ding , Weimin Wang , Kaikai Song , Ting Liu , Lina Hu

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引用次数: 0

Abstract

Li_6.4La₃Zr_1.4Ta_0.6O₁₂ (LLZTO) is widely used in polyethylene oxide (PEO) based solid electrolytes preparation due to its high ionic conductivity, electrochemical stability towards lithium and excellent mechanical properties. However, agglomeration of LLZTO and the inert interfacial layer for Li⁺ transport between LLZTO and PEO limit its application. Herein, we systematically study the effect of different contents of 1-methyl-1-propylpiperidinium bis(trifluoromethylsulfonyl)imide (denoted as PP13-TFSI) ionic liquid on PEO/LLZTO composite solid electrolytes (CSEs). PP13-TFSI, which provides a new pathway for Li⁺ transport and promotes the uniform dispersion of LLZTO. By adjusting the proportion of PP13-TFSI reasonably, the agglomeration of LLZTO is weakened, the crystallinity of PEO is reduced, and the growth of lithium dendrites is also inhibited. Therefore, the CSEs with high ionic conductivity (2.03 × 10⁻⁴ S cm⁻¹, 30 ℃) enhanced by PP13-TFSI. Li||Li symmetric batteries exhibit stable cycling up to 6000 h at 60 °C, and can cycle stably for up to 3000 h at 28 °C. LiFePO₄||Li full batteries exhibit high-capacity retention rate (≈ 90.5 %) after 500 cycles at 1 C. This work not only systematically study the effects of different contents of PP13-TFSI on CSEs, but also provide a simple composite solid electrolyte strategy.

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离子液体驱动Li6.4La3Zr1.4Ta0.6O12/聚乙烯氧化物固体电解质用于高稳定性锂金属电池

Li6.4La3Zr1.4Ta0.6O12 （LLZTO）具有较高的离子电导率、对锂的电化学稳定性和优异的力学性能，广泛应用于聚乙烯氧化物（PEO）基固体电解质的制备。然而，LLZTO的团聚和LLZTO与PEO之间Li+输运的惰性界面层限制了其应用。本文系统研究了不同含量的1-甲基-1-丙基哌啶双（三氟甲基磺酰基）亚胺（PP13-TFSI）离子液体对PEO/LLZTO复合固体电解质（CSEs）的影响。PP13-TFSI，为Li+的输运提供了新的途径，促进了LLZTO的均匀分散。通过合理调整PP13-TFSI的比例，可以减弱LLZTO的团聚，降低PEO的结晶度，抑制锂枝晶的生长。因此，PP13-TFSI增强了具有高离子电导率（2.03 × 10−4 S cm−1,30℃）的cse。Li||锂对称电池在60℃下可稳定循环达6000 h，在28℃下可稳定循环达3000 h。LiFePO4||锂电池在1℃下循环500次后显示出高容量保持率（≈90.5%）。本工作不仅系统地研究了不同含量PP13-TFSI对CSEs的影响，而且提供了一种简单的复合固体电解质策略。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.