A novel phosphonium ionic liquid electrolyte enabling high-voltage and high-energy positive electrode materials in lithium-metal batteries

被引:26
作者
Wu, Fanglin [1 ,2 ]
Schuer, Annika Regitta [1 ,2 ]
Kim, Guk-Tae [1 ,2 ]
Dong, Xu [1 ,2 ]
Kuenzel, Matthias [1 ,2 ]
Diemant, Thomas [1 ]
D'Orsi, Gina [3 ]
Simonetti, Elisabetta [3 ]
De Francesco, Massimo [3 ]
Bellusci, Mariangela [3 ]
Appetecchi, Giovanni Battista [3 ]
Passerini, Stefano [1 ,2 ]
机构
[1] Helmholtz Inst Ulm HIU, Helmholtzstr 11, D-89081 Ulm, Germany
[2] Karlsruhe Inst Technol KIT, POB 3640, D-76021 Karlsruhe, Germany
[3] ENEA, SSPT PROMAS MATPRO Tech Unit, Via Anguillarese 301, I-00123 Rome, Italy
关键词
Phosphonium cation; Ionic liquid; Electrolyte; Li1.2Ni0.2Mn0.6O2; High-voltage lithium-metal battery; ELECTROCHEMICAL PROPERTIES; PHYSICOCHEMICAL PROPERTIES; CATHODE; RICH; PERFORMANCE; INTERPHASE; INTERFACE;
D O I
10.1016/j.ensm.2021.08.030
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The synthesis of a new ionic liquid (IL), consisting of the symmetric tetra-butyl-phosphonium (P-4444(+)) 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+/Li-0 (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.
引用
收藏
页码:826 / 835
页数:10
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