Garnet-Based Solid-State Lithium Fluoride Conversion Batteries Benefiting from Eutectic Interlayer of Superior Wettability,ACS Energy Letters

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Garnet-Based Solid-State Lithium Fluoride Conversion Batteries Benefiting from Eutectic Interlayer of Superior Wettability
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-03-13 , DOI: 10.1021/acsenergylett.0c00383
Yang Zhang _{1,

2} , Junwei Meng _{1,

2} , Keyi Chen _{1,

2} , Han Wu ₁ , Jiulin Hu ₁ , Chilin Li _{1,

2}

Affiliation

Garnet-type Li–La–Zr–O electrolytes suffer from poor contact with the Li metal anode because of the facile formation of a passivation layer at the interface, thus leading to frustrating interfacial impedance or lithium dendrite penetration. Herein, we introduce a eutectic Na–Li intermediate layer between the Li anode and garnet electrolyte to enable sufficient wettability. The potential mechanism of solid–solid convection between Li and Na domains promotes the prompt extension of the eutectic zone, preservation of the highly soldered interface, and homogenization of Li plating during cycling. The Li–Na/garnet/Na–Li cell exhibits a small interfacial resistance of 18.98 Ω·cm² at 60 °C and steady cycling for 3500 h (with a small overpotential of 10.8 mV). The first prototype of a solid-state battery combining a conversion-type FeF₃ cathode with garnet electrolyte is successfully operated at 60 °C, with a high reversible capacity of 500 mAh·g^–1 and ultrastable cycling for 300 cycles at 100 μA·cm^–2, as well as high-rate endurance up to 500 μA·cm^–2.

中文翻译：

石榴石型固态氟化锂转换电池得益于优异的润湿性的共晶中间层

石榴石型Li–La–Zr–O电解质与锂金属阳极的接触不良，因为在界面处容易形成钝化层，从而导致令人沮丧的界面阻抗或锂枝晶渗透。在这里，我们在锂阳极和石榴石电解质之间引入了共晶的Na-Li中间层，以实现足够的润湿性。Li和Na域之间的固-固对流的潜在机制促进了共晶区域的迅速扩展，高度焊接界面的保留以及循环过程中Li镀层的均质化。Li-Na /石榴石/ Na-Li电池的界面电阻很小，为18.98Ω·cm ²在60°C下稳定循环3500小时（小的过电势为10.8 mV）。固态电池的首个原型将转换型FeF ₃阴极与石榴石电解质结合在一起，可在60°C的温度下成功运行，可逆容量为500 mAh·g ^–1，在100μA·下可超循环300次cm ^–2以及高达500μA·cm ^–2的高耐力。

更新日期：2020-04-23

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