Self-Stabilized Solid Electrolyte Interface on a Host-Free Li-Metal Anode toward High Areal Capacity and Rate Utilization,Chemistry of Materials

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Self-Stabilized Solid Electrolyte Interface on a Host-Free Li-Metal Anode toward High Areal Capacity and Rate Utilization
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-05-27 00:00:00 , DOI: 10.1021/acs.chemmater.8b00722
Zhenglin Hu _{1,

2} , Shu Zhang ₁ , Shanmu Dong ₁ , Quan Li _{2,

3} , Guanglei Cui ₁ , Liquan Chen _{1,

3}

Affiliation

Lithium metal has long been regarded as a promising anode for its high energy density and low reduction potential. However, infinite volume change and undesired lithium dendrite and parasitic reactions still block the practical application of lithium-metal anodes, despite persistent research. To address these tough issues, a self-stabilized solid electrolyte interface (SEI) formed in lithium bis(trifluoromethane sulphonyl)imide-vinylene carbonate electrolyte with high ionic conductivity, mechanical strength, and compact structure is reported for the first time, delivering rapid lithium-ion diffusion and suppressed anode/electrolyte interfacial reactions. This excellent SEI contributes to homogeneous lithium plating/stripping and a constant voltage over 4000 h even under harsh conditions. High rate performance with a current density of 20 mA cm^–2 and an areal capacity of 40 mA h cm^–2 has also been achieved. The self-stabilized SEI provides a promising strategy to tackle the challenges raised by the intrinsic properties of a lithium-metal anode.

中文翻译：

无主体锂金属阳极上的自稳定固体电解质界面，可实现较高的面容量和速率利用率

长期以来，锂金属因其高能量密度和低还原电位而被认为是有前途的阳极。然而，尽管进行了持续的研究，但是无限的体积变化以及不希望的锂枝晶和寄生反应仍然阻碍了锂金属阳极的实际应用。为了解决这些棘手的问题，首次报道了在具有高离子电导率，机械强度和紧凑结构的双（三氟甲烷磺酰基）酰亚胺-碳酸亚乙烯酯锂中形成的自稳定固体电解质界面（SEI），可提供快速的锂。离子扩散和抑制的阳极/电解质界面反应。即使在苛刻的条件下，这种出色的SEI也可实现均匀的锂电镀/剥离和在4000小时内保持恒定电压。电流密度为20 mA cm时的高速率性能^–2的面积容量为40 mA h cm ^–2。自稳定的SEI提供了一种有前途的策略，可以解决锂金属阳极的固有特性所带来的挑战。

更新日期：2018-05-27

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