<br>用于高性能锂金属电池的Li6.4La3Zr1.4Ta0.6O12/Ce(OH)3改性聚丙烯复合隔膜中多个均匀的锂离子传输通道,Journal of Colloid and Interface Science

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用于高性能锂金属电池的Li6.4La3Zr1.4Ta0.6O12/Ce(OH)3改性聚丙烯复合隔膜中多个均匀的锂离子传输通道
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2024-05-24 , DOI: 10.1016/j.jcis.2024.05.184
Bangxing Li ₁ , Xing Kang ₁ , Xiaofeng Wu ₂ , Xiaolin Hu ₁

Affiliation

锂（Li）金属负极（LMA）因其高理论容量和良好的氧化还原电位而被视为先进电池的领先技术。然而，锂枝晶生长的挑战阻碍了 LMA 与高能可充电电池的实际集成。在这项工作中，通过水热法设计并合成了负载Ce(OH) (LLZTCO)的LiLaZrTaO (LLZTO)纳米颗粒。通过在聚丙烯（PP）隔膜的一侧涂覆由聚偏二氟乙烯（PVDF）和LLZTCO组成的复合电解质，制作出功能性复合隔膜。 PVDF 和 LLZTCO 之间的协同相互作用提供了许多快速的锂离子 (Li) 通道，有助于有效地重新分配源自绝缘 PP 隔膜的不同 Li 通量。该复合隔膜的离子电导率 () 为 3.68 × 10 S cm，Li 迁移数 () 为 0.73，25℃ 时的电化学窗口为 4.8 V。此外，Li/LLZTCO@PP/Li 对称电池表现出超过 2000 小时的稳定循环，没有明显的枝晶形成。使用 LLZTCO@PP 隔膜组装的 Li/LiFePO (LFP) 电池在 1C 下循环 400 次后容量保持率为 91.6%。这项研究提供了一种制造具有增强安全性和优异电化学性能的复合隔膜的实用方法。

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Multiple uniform lithium-ion transport channels in Li6.4La3Zr1.4Ta0.6O12/Ce(OH)3 modified polypropylene composite separator for high-performance lithium metal batteries

Lithium (Li) metal anodes (LMAs) are regarded as leading technology for advanced-generation batteries due to their high theoretical capacity and favorable redox potential. However, the practical integration of LMAs into high-energy rechargeable batteries is hindered by the challenge of Li dendrite growth. In this work, nanoparticles of LiLaZrTaO (LLZTO) loaded with Ce(OH) (LLZTCO) were designed and synthesized by a hydrothermal method. A functional composite separator was crafted by coating one side of a polypropylene (PP) separator with a composite electrolyte comprised of polyvinylidene fluoride (PVDF) and LLZTCO. The synergistic interactions between PVDF and LLZTCO provide numerous rapid lithium-ion (Li) channels, facilitating the efficient redistribution of disparate Li flux originating from the insulated PP separator. The composite separator demonstrated an ionic conductivity () of 3.68 × 10 S cm, substantial Li transference number () of 0.73, and a high electrochemical window of 4.8 V at 25℃. Furthermore, the Li/LLZTCO@PP/Li symmetric cells demonstrated stable cycling for over 2000 h without significant dendrite formation. The Li/LiFePO (LFP) cells assembled with LLZTCO@PP separators exhibited a capacity retention of 91.6 % after 400 cycles at 1C. This study offers a practical approach to fabricating composite separators with enhanced safety and superior electrochemical performance.

更新日期：2024-05-24

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