An asymmetric double-layer poly(ethylene oxide)/inorganic composite electrolyte for stable and dendrite-suppressing all-solid-state Li metal battery

环氧乙烷 电解质 电池(电) 枝晶(数学) 复合数 材料科学 金属 氧化物 图层(电子) 化学工程 固态 聚乙烯 无机化学 化学 乙烯 纳米技术 电极 复合材料 冶金 有机化学 聚合物 催化作用 物理化学 功率(物理) 物理 几何学 数学 量子力学 工程类 共聚物
作者
Haotong Li,Jing Liu,Fei Deng,Husitu Lin,Deping Wang,Xia Tao
出处
期刊:Journal of Power Sources [Elsevier BV]
卷期号:602: 234372-234372 被引量:6
标识
DOI:10.1016/j.jpowsour.2024.234372
摘要

Poly (ethylene oxide) (PEO)-based electrolytes are promising in all-solid-state Li metal batteries on account of their distinct merits of cost-effectiveness, good chemical stability against Li metal and facile large-scale membrane fabrication. However, the application of PEO-based electrolytes is mainly hindered by their low ionic conductivity and the risk of short circuit derived from lithium dendrite growth. In this study, we report an asymmetric composite PEO-based solid electrolyte with a bilayer structure, i.e. Li6PS5Cl-PEO-LiTFSI/Li1.3Al0.3Ti1.7(PO4)3-PEO-LiTFSI (LPSCl-PEO/LATP-PEO) composite electrolyte, in which the LATP-PEO layer as the main part of electrolyte faces toward the LiFePO4 cathode and the LPSCl-PEO layer contacts with Li metal. The ionic conductivity of LPSCl-PEO/LATP-PEO based on 2 % of LPSCl nanoparticles and containing 15 % of LATP nanoparticles reaches up to 3.37 × 10−4 S cm−1, comparable to that of other modified PEO-base electrolyte. Benefiting from the excellent ionic transport capacity and interfacial stability, the Li/Li batteries based on the optimal LPSCl-PEO/LATP-PEO stably cycles over 2000 h with no short-circuit at a current density of 0.2 mA cm−2, which is significantly better than pure PEO and unmodified LATP-PEO single-layer electrolyte. Moreover, Li/LiFePO4 all-solid-state battery with the LPSCl-PEO/LATP-PEO electrolyte has a highest capacity of 156.3 mAh g−1 with a capacity decay rate of 0.0375 % per cycle after 400 cycles at 0.5C, and its coulombic efficiency approaching 100 %. This asymmetric double-layer structure electrolyte prepared by a simple and scalable solution casting method provides a feasible solution for the application in stable and dendrite-suppressing all-solid-state Li metal battery.
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