Mixed Salts of Lithium Difluoro (Oxalate) Borate and Lithium Tetrafluorobotate Electrolyte on Low-Temperature Performance for Lithium-Ion Batteries

Zhao, Qiuping; Zhang, Yu; Tang, Fengjuan; Zhao, Jiachen; Li, Shiyou

doi:10.1149/2.0851709jes

Cited by 31 publications

(26 citation statements)

References 46 publications

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“…Dual‐salt electrolyte systems adopting two thermally stable main lithium salts have been proposed to significantly enhance the performances of both LIBs and LMBs . For the wide temperature operation of LIBs, thermally stable lithium borates (such as lithium tetrafluoroborate (LiBF 4 ), lithium bis(oxalato)borate (LiBOB), lithium difluoro(oxalate)borate (LiDFOB), etc.)…”

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confidence: 99%

Additive‐Assisted Novel Dual‐Salt Electrolyte Addresses Wide Temperature Operation of Lithium–Metal Batteries

Shangguan

Cui

et al. 2019

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plating/stripping. [7][8][9][10][11][12][13][14][15] As a result, LMB always suffer from rapid capacity deterioration and high safety risk, especially at high charge/discharge rates and over a wide temperature range (from subzero temperatures to high temperatures). Encouragingly, varied strategies have been devoted to explore the Li-dendrite growth mechanism and Li-metal protection. [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Wherein, one of the most effective and feasible strategy in protecting Li metal is electrolyte optimization, such as developing ionic liquids, [16] dual-salt electrolytes with additives, [20] gel polymer electrolyte, [18,27,28] concentrated electrolytes, [9,[24][25][26]29,30] etc.Undoubtedly, wide temperature range high-energy LMBs are urgently demanded for special applications, such as carrying out special missions in polar areas, desert areas, snowy mountains region, and outer space. [31] However, the operation of LMBs over a wide temperature range is seldom reported because of the fact that it is a huge challenge to find a compromise between subzero temperature performances and high temperature performances. [31][32][33] At subzero temperatures, due to the significantly reduced Li + conductivity (increased viscosity) of electrolyte and simultaneously increased charge transfer resistances, the severe growth of Li dendrites will become more uncontrolled. [31,34] At high temperatures, the bottlenecks are thermal instability of conventional LiPF 6 salt, severe solid electrolyte interphase (SEI) layer destruction-reformation accompanied by severe gas evolution, and accelerated transition metal dissolution-migration-deposition. [31] Significantly, formulating an electrolyte will play a dominant role in enabling the wide temperature operation of LMBs.Dual-salt electrolyte systems adopting two thermally stable main lithium salts have been proposed to significantly enhance the performances of both LIBs and LMBs. [20,[33][34][35][36][37][38][39][40][41][42] For the wide temperature operation of LIBs, thermally stable lithium borates (such as lithium tetrafluoroborate (LiBF 4 ), lithium bis(oxalato)borate (LiBOB), lithium difluoro(oxalate)borate (LiDFOB), etc.) dissolved in low melting point and high boiling point carbonatebased solvents (such as propylene carbonate (PC, T m = −48.8 °C, T b = 242 °C), ethyl methyl carbonate (EMC, T m = −53 °C, T b = 110 °C), etc.), have been investigated. [33][34][35][36][37][38] Recently, we have reviewed the potential application of functional lithium-borate salts in high performance lithium batteries, [43] and have successfully synthesized a bulky anion lithium trifluoro(perfluoro-tert-butyloxyl)borate (Li[(CF 3 ) 3 COBF 3 ], LiTFPFB), which exhibits high Li + conductivity and oxidation stability, as well as noncorrosivity to In this study, self-synthesized lithium trifluoro(perfluoro-tert-butyloxyl) borate (LiTFPFB) is combined with lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) to formulate a novel 1 m dual-salt electrolyte, which contain...

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confidence: 99%

Additive‐Assisted Novel Dual‐Salt Electrolyte Addresses Wide Temperature Operation of Lithium–Metal Batteries

Shangguan

Cui

et al. 2019

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“…Recently, we reviewed progress in functional lithium borate salts for lithium batteries and developed some novel lithium borates . For the development of high‐energy and high‐performance LIBs (especially over a wide temperature range), blended‐salt electrolytes based on LiBF 4 , which is favorable at low temperature (but shows poor compatibility with the graphite anode in alkyl carbonate solvents), and LiBOB or LiDFOB, which are favorable at high temperature (and also with respect to the SEI layer), have been proposed . Duncan et al.…”

Section: Blended‐salt Electrolytes For Lithium‐ion Batteriesmentioning

confidence: 99%

“…Later, a 0.8 m LiDFOB/0.2 m LiBF 4 (EC/DMC/EMC) based blended‐salt electrolyte was optimized out to enable the excellent wide‐temperature operation (−20–60 °C) of a high‐voltage (5 V class) LiNi 0.5 Mn 1.5 O 4 /graphite full cell . Cosolvents with a low melting point, high boiling point, or low viscosity (such as PC, the aliphatic ester methyl butanoate (MB), dimethyl sulfite (DMS)) are preferred for formulating electrolytes for a wide temperature range, especially subzero temperatures . Thus, 0.8 m LiBF 4 /0.2 m LiBOB (PC/EC/EMC/MB) and 0.5 m LiBF 4 /0.5 m LiDFOB (EC/DEC/DMS) were designed for a LiFePO 4 /Li cell, while 0.8 m LiBF 4 /0.2 m LiDFOB (PC/EC/EMC) was evaluated in a LiCoO 2 /Li cell.…”

Section: Blended‐salt Electrolytes For Lithium‐ion Batteriesmentioning

confidence: 99%

Formulation of Blended‐Lithium‐Salt Electrolytes for Lithium Batteries

et al. 2019

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Blended‐salt electrolytes showing synergistic effects have been formulated by simply mixing several lithium salts in an electrolyte. In the burgeoning field of next‐generation lithium batteries, blended‐salt electrolytes have enabled great progress to be made. In this Review, the development of such blended‐salt electrolytes is examined in detail. The reasons for formulating blended‐salt electrolytes for lithium batteries include improvement of thermal stability (safety), inhibition of aluminum‐foil corrosion of the cathode current collector, enhancement of performance over a wide temperature range (or at a high or low temperature), formation of favorable interfacial layers on both electrodes, protection of the lithium metal anode, and attainment of high ionic conductivity. Herein, we highlight key scientific issues related to the formulation of blended‐salt electrolytes for lithium batteries.

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“…In den letzten Jahren haben wir einen Überblick über die Fortschritte bei funktionellen Lithiumboratsalzen in Lithium‐Batterien gegeben und einige neue Lithiumborate erschlossen . Für die Entwicklung von LIBs mit hoher Energie und Leistung (insbesondere über einen breiten Temperaturbereich) wurden Gemischtsalz‐Elektrolyte vorgeschlagen, die auf LiBF 4 sowie auf LiBOB oder LiDFOB beruhten; das Erstgenannte ist vorteilhaft bei niedrigen Temperaturen (aber wenig kompatibel mit der Graphit‐Anode in Alkylcarbonaten als Lösungsmittel), und die beiden anderen sind bei hohen Temperaturen (und auch hinsichtlich der SEI) von Vorteil . Duncan et al.…”

Section: Gemischtsalz‐elektrolyte Für Die Li‐ionen‐batterieunclassified

“…Cosolventien mit niedrigem Schmelzpunkt, hohem Siedepunkt oder niedriger Viskosität (z. B. PC, aliphatische Ester wie Methylbutanoat (MB), Dimethylsulfit (DMS)) werden für die Formulierung von Elektrolyten für einen breiten Temperaturbereich, insbesondere für Minustemperaturen, bevorzugt …”

Section: Gemischtsalz‐elektrolyte Für Die Li‐ionen‐batterieunclassified

Formulierung von Elektrolyten mit gemischten Lithiumsalzen für Lithium‐Batterien

Shangguan

Dong

et al. 2019

Angewandte Chemie

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Durch einfaches Mischen verschiedener Lithiumsalze im Elektrolyten werden Gemischtsalz‐Elektrolyte formuliert, um einen synergistischen Effekt zu bewirken. Auf dem Gebiet der Lithium‐Batterien der nächsten Generation wurden große Fortschritte mit Gemischtsalz‐Elektrolyten erzielt. In diesem Aufsatz wird die Entwicklung derartiger Gemischtsalz‐Elektrolyten näher ausgeführt. Die Ziele der Formulierung von Gemischtsalz‐Elektrolyten für Lithium‐Batterien werden zusammengefasst: Verbesserung der thermischen Stabilität (Sicherheit), Verhindern der Korrosion der Aluminiumfolie des Kathoden‐Stromkollektors, Steigerung der Leistung über einen breiten Temperaturbereich (oder bei niedrigen oder hohen Temperaturen), Bildung günstiger Grenzflächenschichten an beiden Elektroden, Schützen der Lithium‐Metall‐Anode, Erreichen einer hohen Ionenleitfähigkeit usw. Darüber hinaus diskutieren wir wesentliche Aspekte bei der Formulierung von Gemischtsalz‐Elektrolyten für Lithium‐Batterien.

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Mixed Salts of Lithium Difluoro (Oxalate) Borate and Lithium Tetrafluorobotate Electrolyte on Low-Temperature Performance for Lithium-Ion Batteries

Cited by 31 publications

References 46 publications

Additive‐Assisted Novel Dual‐Salt Electrolyte Addresses Wide Temperature Operation of Lithium–Metal Batteries

Additive‐Assisted Novel Dual‐Salt Electrolyte Addresses Wide Temperature Operation of Lithium–Metal Batteries

Formulation of Blended‐Lithium‐Salt Electrolytes for Lithium Batteries

Formulierung von Elektrolyten mit gemischten Lithiumsalzen für Lithium‐Batterien

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