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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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