Modifying an ultrathin insulating layer to suppress lithium dendrite formation within garnet solid electrolytes,Journal of Materials Chemistry A

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Modifying an ultrathin insulating layer to suppress lithium dendrite formation within garnet solid electrolytes
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-12-22 , DOI: 10.1039/d0ta11311e
Shijun Tang _{1,

2,

3,

4} , Guiwei Chen _{1,

2,

3,

4} , Fucheng Ren _{1,

2,

3,

4} , Hongchun Wang _{1,

2,

3,

4} , Wu Yang _{1,

2,

3,

4} , Chenxi Zheng _{1,

2,

3,

4} , Zhengliang Gong _{1,

2,

3,

4} , Yong Yang _{1,

2,

3,

4,

5}

Affiliation

The electronic conductivity of solid electrolytes, which plays an important role in inducing Li dendrite deposition, is a key obstacle to the practical application of Li metal in all-solid-state lithium metal batteries. Herein, an ultrathin insulating LiF coating with controllable thickness is proposed as an electronic isolation layer to inhibit the formation of Li dendrites. The homogeneous LiF interfacial layer can effectively facilitate the physical contact of the Li metal and LLZTO electrolyte and promote uniform Li plating/stripping. In contrast to the inhomogeneous lithium nucleation and dendritic lithium growth in an unmodified LLZTO electrolyte induced by electron beam irradiation, dendritic Li deposition is efficiently inhibited on LiF coated LLZTO. The Li|0.5LF-LLZTO|Li symmetric cell exhibits a low interfacial impedance of 12.7 ohm cm² and stable Li plating/stripping without lithium penetration, over 1500 hours at 0.2 mA cm⁻² and 300 hours at 0.4 mA cm⁻². Besides, the Li|0.5LF-LLZTO|LiCoO₂ full cell also shows excellent long-term cycling stability with a high capacity retention of 76.8% after 2500 cycles at 1C. Our results reveal the importance of tuning the interface modification layer properties to guide the uniform lithium plating toward suppressing Li dendrite formation in solid electrolytes.

中文翻译：

修改超薄绝缘层以抑制石榴石固体电解质中锂枝晶的形成

在诱导锂枝晶沉积中起重要作用的固体电解质的电子电导率是金属锂在全固态锂金属电池中实际应用的主要障碍。在本文中，提出了具有可控制厚度的超薄绝缘LiF涂层作为抑制Li树枝状晶体形成的电子隔离层。均匀的LiF界面层可以有效地促进Li金属和LLZTO电解质的物理接触并促进均匀的Li镀覆/剥离。与通过电子束辐照引起的未改性LLZTO电解质中锂的不均匀成核和树枝状锂的生长相反，在LiF包覆的LLZTO上有效抑制了树枝状Li的沉积。Li | 0.5LF-LLZTO | Li对称电池的界面阻抗低至12.7 ohm cm²和在没有锂渗透的情况下稳定的Li镀层/剥离层在0.2 mA cm^-2下经过1500小时，在0.4 mA cm^-2下经过300小时。此外，Li | 0.5LF-LLZTO | LiCoO₂充满电池还显示出优异的长期循环稳定性，在1C下经过2500次循环后的容量保持率高达76.8％。我们的结果表明，调整界面改性层的性能以引导均匀的锂电镀抑制固体电解质中Li枝晶的形成非常重要。

更新日期：2021-01-20

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