An artificial hybrid interphase for an ultrahigh-rate and practical lithium metal anode,Energy & Environmental Science

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An artificial hybrid interphase for an ultrahigh-rate and practical lithium metal anode
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-5-28 , DOI: 10.1039/d1ee00508a
Anjun Hu _{1,

2,

3,

4} , Wei Chen _{1,

2,

3,

4} , Xinchuan Du _{1,

2,

3,

4} , Yin Hu _{1,

2,

3,

4,

5} , Tianyu Lei _{1,

2,

3,

4} , Hongbo Wang _{1,

2,

3,

4} , Lanxin Xue _{1,

2,

3,

4} , Yaoyao Li _{1,

2,

3,

4} , He Sun _{1,

2,

3,

4} , Yichao Yan _{1,

2,

3,

4} , Jianping Long _{4,

6,

7,

8} , Chaozhu Shu _{4,

6,

7,

8} , Jun Zhu _{1,

2,

3,

4} , Baihai Li _{2,

4,

5,

9} , Xianfu Wang _{1,

2,

3,

4} , Jie Xiong _{1,

2,

3,

4}

Affiliation

The solid electrolyte interphase (SEI) layer is pivotal for stable lithium (Li) metal batteries especially under a high rate. However, the mechanism of Li⁺ transport through the SEI has not been clearly elucidated to build robust Li anodes for practical Li metal batteries. Herein, an artificial hybrid SEI layer consisting of lithium-antimony (Li₃Sb) alloy and lithium fluoride (LiF) is constructed to explore the ion diffusion behaviors within the SEI. As evidenced theoretically and experimentally, Li₃Sb is identified as a superionic conductor for Li⁺ transport and as an interfacial stabilizer for the SEI layer while the LiF component with superior electron-blocking capability reduces the electron tunneling from the Li anode into the SEI, resulting in uniform dendrite-free Li deposition at the SEI/Li interface and stable Li plating/stripping behaviors at an ultrahigh rate of 20 mA cm⁻². A practical 325.28 W h kg⁻¹ pouch cell is well demonstrated under a high sulfur loading of 6 mg cm⁻² and a low electrolyte/sulfur ratio of 3 μl mg⁻¹. This work uncovers the internal mechanism of Li⁺ transport within the SEI component, and provides an avenue to stabilize the Li anode under practical high-rate conditions.

中文翻译：

用于超高倍率和实用锂金属负极的人工混合界面

固体电解质中间相 (SEI) 层对于稳定的锂 (Li) 金属电池至关重要，尤其是在高倍率下。然而，尚未清楚阐明通过 SEI 传输Li ⁺的机制以构建用于实用锂金属电池的坚固锂负极。在此，构建了由锂锑 (Li ₃ Sb) 合金和氟化锂 (LiF)组成的人工混合 SEI 层，以探索 SEI 内的离子扩散行为。理论和实验证明，Li ₃ Sb 被确定为 Li ⁺的超离子导体传输并作为 SEI 层的界面稳定剂，而具有优异电子阻挡能力的 LiF 组分减少了从锂负极到 SEI 的电子隧穿，导致在 SEI/Li 界面处均匀无枝晶的锂沉积和稳定的锂电镀/ 20 mA cm ^-2超高速率下的剥离行为。实用的 325.28 W h kg ^-1软包电池在 6 mg cm ^{-2 的}高硫负载和 3 μl mg ^-1的低电解质/硫比下得到了很好的证明。这项工作揭示Li的内部机构⁺的SEI成分内运输，并且提供一个途径，以稳定实际高速率的条件下Li阳极。

更新日期：2021-06-22

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