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Oxygen-Induced Lithiophilicity of Tin-based Framework toward Highly Stable Lithium Metal Anode
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2020-03-22 , DOI: 10.1016/j.cej.2020.124848
Lei Tan , Shihao Feng , Xinhai Li , Zhixing Wang , Wenjie Peng , Tiancheng Liu , Guochun Yan , Lingjun Li , Feixiang Wu , Jiexi Wang

The uncontrollable dendrite formation and infinite volume expansion bring serious safety risks and short service life to high-energy lithium metal batteries. Here, by introducing oxygen as a type of SnO2 into the Sn and carbon paper (CP) composite, a lithiophilic framework (CP/Sn/SnO2) is proposed as lithium storage host for stable Li metal anode. It demonstrates that the wettability of the framework to Li can be greatly improved by partial oxidation of Sn. Then, the spontaneous reaction between the formed SnO2 and molten Li can induce the alloying of Li and Sn. Consequently, both of Sn and SnO2 in the framework finally converse to lithiophilic Li-Sn alloy as well as a small amount of lithium conductor Li2O. After molten Li injection, the prepared CP/Sn/SnO2@Li electrode achieves a dendrite-free morphology, near-zero volume change and extraordinary electrochemical performance. Furthermore, low interfacial resistance and long-term lifetime for 800 h at 1 mA cm-1 with an ultra-low voltage hysteresis of 16 mV in symmetric cells and excellent cycling stability in full cells with LiFePO4 cathode are realized. The oxygen-induced strategy provides important advancement for a stable 3D lithiophilic framework with low Li2O content in developing safe and commercial Li metal batteries.



中文翻译:

氧诱导锡基骨架对高度稳定的锂金属阳极的亲硫性

不可控制的枝晶形成和无限的体积膨胀给高能锂金属电池带来严重的安全隐患和使用寿命短。在此,通过将氧作为SnO 2的类型引入Sn和碳纸(CP)复合材料中,提出了亲硫的骨架(CP / Sn / SnO 2)作为稳定的Li金属阳极的锂存储主体。结果表明,通过锡的部分氧化,可以大大提高骨架对锂的润湿性。然后,所形成的SnO 2与熔融的Li之间的自发反应可以引起Li和Sn的合金化。因此,骨架中的Sn和SnO 2最终都转变为亲硫的Li-Sn合金以及少量的锂导体Li 2。O.注入熔融的Li后,所制备的CP / Sn / SnO 2 @Li电极实现了无枝晶形态,接近零的体积变化和出色的电化学性能。此外,实现了低界面电阻和在1 mA cm -1下800 h的长期使用寿命,在对称电池中具有16 mV的超低电压磁滞,并且在使用LiFePO 4阴极的完整电池中具有出色的循环稳定性。在开发安全和商用的锂金属电池中,氧诱导的策略为具有低Li 2 O含量的稳定3D锂硫骨架提供了重要的进展。

更新日期:2020-03-22
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