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A novel phosphonium ionic liquid electrolyte enabling high-voltage and high-energy positive electrode materials in lithium-metal batteries
Energy Storage Materials ( IF 18.9 ) Pub Date : 2021-08-25 , DOI: 10.1016/j.ensm.2021.08.030
Fanglin Wu 1, 2 , Annika Regitta Schür 1, 2 , Guk-Tae Kim 1, 2 , Xu Dong 1, 2 , Matthias Kuenzel 1, 2 , Thomas Diemant 1 , Gina D'Orsi 3 , Elisabetta Simonetti 3 , Massimo De Francesco 3 , Mariangela Bellusci 3 , Giovanni Battista Appetecchi 3 , Stefano Passerini 1, 2
Affiliation  

The synthesis of a new ionic liquid (IL), consisting of the symmetric tetra-butyl-phosphonium (P4444+) cation and the (nonafluorobutanesulfonyl-trifluoromethanesulfonyl) imide (IM14) anion, via a facile and environmentally-friendly aqueous route is reported. The novel P4444IM14 IL demonstrates excellent thermal and electrochemical stability (beyond 6 V vs. Li+/Li0 (against Ni-foil)) in combination with good near-room temperature conductivity and ionic liquid characteristics, such as non-measurable volatility and exceptional flame-retardant properties. Employed as electrolyte component in Li-metal cells together with the high-voltage, Li1.2Ni0.2Mn0.6O2 positive electrode material, enables an initial discharge capacity of 264 mA h g-1 at 12.5 mA g−1 and improved initial Coulombic efficiency. Additionally, the discharge capacity retention is promising (92.3% after 50 cycles and 84.4% after 100 cycles) when compared with using a conventional organic carbonate-based electrolyte (55.5% after 50 cycles). Further development of this ionic liquid electrolyte may facilitate the practical application of Li-metal anodes in high-voltage/high-energy lithium batteries.



中文翻译:

一种新型鏻离子液体电解质使锂金属电池中的高电压和高能量正极材料成为可能

一种新的离子液体 (IL),由对称的四丁基鏻 (P 4444 + ) 阳离子和(九氟丁磺酰基-三氟甲磺酰基)亚胺 (IM 14 ) 阴离子组成,通过一种简便且环保的水性途径合成被报道。新型 P 4444 IM 14 IL 表现出优异的热和电化学稳定性(超过 6 V vs. Li + /Li 0(针对镍箔)),以及良好的近室温电导率和离子液体特性,例如不可测量挥发性和卓越的阻燃性能。与高电压 Li 1.2一起用作锂金属电池中的电解质组分0.20.6 ø 2正极材料,使得能够264毫安ħg的初始放电容量-1在12.5毫安克-1和改进的初始库仑效率。此外,与使用传统的有机碳酸盐基电解质(50 次循环后 55.5%)相比,放电容量保持率(50 次循环后 92.3% 和 100 次循环后 84.4%)很有希望。这种离子液体电解质的进一步发展可以促进锂金属负极在高电压/高能锂电池中的实际应用。

更新日期:2021-08-25
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