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

被引：30

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

来源：

ENERGY STORAGE MATERIALS | 2021年 / 42卷

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

页码：826 / 835

页数：10

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