A dual-salt coupled fluoroethylene carbonate succinonitrile-based electrolyte enables Li-metal batteries†,Journal of Materials Chemistry A

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A dual-salt coupled fluoroethylene carbonate succinonitrile-based electrolyte enables Li-metal batteries†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-12-25 , DOI: 10.1039/c9ta11341j
Chuankai Fu _{1,

2,

3,

4,

5} , Yulin Ma _{1,

2,

3,

4,

5} , Shuaifeng Lou _{1,

2,

3,

4,

5} , Can Cui _{1,

2,

3,

4,

5} , Lizhi Xiang _{1,

2,

3,

4,

5} , Wei Zhao _{5,

6,

7} , Pengjian Zuo _{1,

2,

3,

4,

5} , Jiajun Wang _{1,

2,

3,

4,

5} , Yunzhi Gao _{1,

2,

3,

4,

5} , Geping Yin _{1,

2,

3,

4,

5}

Affiliation

Succinonitrile (SN)-based electrolytes are attractive due to their considerable ionic conductivity and high oxidative stability. However, the spontaneous chemical side-reactions between SN and Li-metal restrict the extensive applications of such electrolytes in next-generation advanced Li-metal batteries. Herein, we report a novel SN-based electrolyte SN–DLi–FEC which combines the dual-salt (lithium bis(trifluoromethane sulfonimide) (LiTFSI) and lithium difluoro(oxalato)borate (LiODFB)) and the fluoroethylene carbonate (FEC) additive. Compared with other SN-based electrolytes such as SN–SLi–FEC (single salt combined with FEC), SN–DLi–FEC can form a more stable and durable organic–inorganic composite SEI film rich in the B–F bond and LiF on the surface of the Li-metal anode. As a result, interfacial compatibility of the SN-based electrolytes and the Li-metal anode can be significantly enhanced. Moreover, SN–DLi–FEC shows high oxidation resistance, high ionic conductivity and good thermal stability. The LiCoO₂ (LCO)/Li battery equipped with SN–DLi–FEC exhibits excellent electrochemical performances at room temperature (RT) and high temperature, and high thermal safety. The novel SN-based electrolyte prepared in this work could be a promising candidate providing better reliability and safety for the development of Li-metal batteries.

中文翻译：

双盐偶联的氟代碳酸亚乙酯琥珀腈基电解质可实现锂金属电池†

基于丁二腈（SN）的电解质具有诱人的离子电导率和高氧化稳定性，因此颇具吸引力。但是，SN和锂金属之间的自发化学副反应限制了此类电解质在下一代高级锂金属电池中的广泛应用。在此，我们报告了一种新型的基于SN的电解质SN–DLi–FEC，它结合了双盐（双（三氟甲烷磺酰亚胺锂）（LiTFSI）和二氟（草酸硼酸）锂（LiODFB））和氟代碳酸亚乙酯（FEC）添加剂。与其他基于SN的电解质（例如SN–SLi–FEC（单盐与FEC结合））相比，SN–DLi–FEC可以形成更加稳定和耐用的有机-无机复合SEI膜，富含B-F键和LiF锂金属阳极的表面。因此，SN基电解质和锂金属阳极的界面相容性可以得到显着提高。此外，SN–DLi–FEC具有高抗氧化性，高离子电导率和良好的热稳定性。LiCoO配备SN–DLi–FEC的₂（LCO）/ Li电池在室温（RT）和高温下具有出色的电化学性能，并具有很高的热安全性。在这项工作中制备的新型基于SN的电解质可能是有前途的候选者，为锂金属电池的开发提供更好的可靠性和安全性。

更新日期：2020-01-08

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