Functional Electrolyte of Fluorinated Ether and Ester for Stabilizing Both 4.5 V LiCoO2 Cathode and Lithium Metal Anode.,ACS Applied Materials & Interfaces

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Functional Electrolyte of Fluorinated Ether and Ester for Stabilizing Both 4.5 V LiCoO2 Cathode and Lithium Metal Anode.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-02-10 , DOI: 10.1021/acsami.9b21679
Shuangshuang Lin ₁ , Jinbao Zhao ₁

Affiliation

In our work, fluoroethylene carbonate (FEC) with higher ionic conductivity and oxidative stability has been used to replace ethylene carbonate along with 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (HFE) added to obtain a trisolvent electrolyte system of 1.2 M LiPF6 in FEC/dimethyl carbonate/HFE (1:1:1 by volume). In addition, on the basis of such an electrolyte, we have also added 0.15 M lithium difluoro(oxalato)borate as a film-forming additive to further stabilize both the cathode and anode, so that a new bifunctional electrolyte of 1.35 M has been obtained. The new electrolyte enables Li||LiCoO2 batteries to maintain nearly 84% capacity after 300 cycles when charged to 4.5 V under the current density of 200 mA g-1. Meanwhile, it can also make Li||Cu half-cells maintain about 98% coulombic efficiency after being charged/discharged 200 times under 1 mA cm-2 current density and 1 mAh cm-2 lithium deposition amount per cycle, showing an obvious advantage in the stability of lithium metal.

中文翻译：

用于稳定4.5 V LiCoO2阴极和锂金属阳极的氟化醚和酯的功能性电解质。

在我们的工作中，具有较高离子电导率和氧化稳定性的氟代碳酸亚乙酯（FEC）已与添加到其中的1,1,2,2-四氟乙基-2,2,3,3-四氟丙基醚（HFE）一起替代了碳酸亚乙酯。在FEC /碳酸二甲酯/ HFE（体积比为1：1：1）中获得1.2 M LiPF6的三溶剂电解质体系。另外，在这种电解质的基础上，我们还添加了0.15 M的二氟（草酸）硼酸锂作为成膜添加剂，以进一步稳定阴极和阳极，从而获得了1.35 M的新型双功能电解质。。新的电解液使Li || LiCoO2电池在200 mA g-1的电流密度下充电至4.5 V后，在300次循环后可以保持近84％的容量。与此同时，

更新日期：2020-02-10

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