Lithium Borate Ester Salts for Electrolyte Application in Next‐Generation High Voltage Lithium Batteries

Roy, Binayak; Cherepanov, Pavel V.; Nguyen, Cuc; Forsyth, Craig M.; Pal, Urbi; Mendes, Tiago C.; Howlett, Patrick C.; Forsyth, Maria; MacFarlane, Douglas R.; Kar, Mega

doi:10.1002/aenm.202101422

Cited by 47 publications

(66 citation statements)

References 51 publications

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“…Magnesium(II) bis(trifluoromethylsulfonyl)imide (Mg(TFSI) 2 ; 99.5%) was purchased from Solvionic. Lithium 1,1,1,3,3,3-(tetrakis)hexafluoroisopropoxy borate (LiBHfip) was prepared by exactly following the published procedure using the same reagents . Trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide ([P 6,6,6,14 ][TFSI]) was synthesized by the metathesis reaction reported previously using LiTFSI as a TFSI – source.…”

Section: Methodsmentioning

confidence: 99%

High-Performance Magnesium Electrochemical Cycling with Hybrid Mg–Li Electrolytes

Krebsz

Johnston

Nguyen

et al. 2022

ACS Appl. Mater. Interfaces

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Kinetics and coulombic efficiency of the electrochemical magnesium plating and stripping processes are to a significant extent defined by the composition of the electrolyte solution, optimization of which presents a pathway for improved performance. Adopting this strategy, we undertook a systematic investigation of the Mg0/2+ process in different combinations of the Mg2+–Li+–borohydride–bis(trifluoromethylsulfonyl)imide (TFSI–) electrolytes in 1,2-dimethoxyethane (DME) solvent. Results indicate that the presence of BH4 – is essential for high coulombic efficiency, which coordination to Mg2+ was confirmed by Raman and NMR spectroscopic analysis. However, the high rates observed also require the presence of Li+ and a supplementary anion such as TFSI–. The Li+ + BH4 – + TFSI– combination of ionic species prevents passivation of the magnesium surface and thereby enables efficient Mg0/2+ electrochemical cycling. The best Mg0/2+ performance with the stabilized coulombic efficiency of 88 ± 1% and one of the highest deposition/stripping rates at ambient temperature reported to date are demonstrated at an optimal [Mg(BH4)2]:[LiTFSI] mole ratio of 1:2.

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Section: Methodsmentioning

confidence: 99%

High-Performance Magnesium Electrochemical Cycling with Hybrid Mg–Li Electrolytes

Krebsz

Johnston

Nguyen

et al. 2022

ACS Appl. Mater. Interfaces

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“…Furthermore, a new borate‐based lithium salt was found to improve the stability of high‐voltage lithium batteries and protect Al current collectors from corrosion. [ 72 ] Li et al newly developed three lithium difluoro‐2‐fluoro‐2‐alkyl‐malonatoborate salts LiDFMFMB, LiDFEFMB, and LiDFPFMB as additives to improve the high‐voltage cycle performance of commercial EC/DMC/DEC (1:1:1 by volume) systems on batteries based on high‐voltage LNMO cathodes. [ 73 ] Only 0.05 m additives are needed to form an effective passivation layer on the surface of the LNMO cathode, and the electrolyte containing the additives can significantly inhibit the co‐intercalation of the solvent into the graphite anode during the first cycle.…”

Section: Different Electrolyte Modification Strategies Improve High‐v...mentioning

confidence: 99%

High‐Voltage Electrolyte Chemistry for Lithium Batteries

Guo

Wang

et al. 2022

Small Science

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Lithium batteries are currently the most popular and promising energy storage system, but the current lithium battery technology can no longer meet people's demand for high energy density devices. Increasing the charge cutoff voltage of a lithium battery can greatly increase its energy density. However, as the voltage increases, a series of unfavorable factors emerges in the system, causing the rapid failure of lithium batteries. To overcome these problems and extend the life of high‐voltage lithium batteries, electrolyte modification strategies have been widely adopted. Under this content, this review first introduces the degradation mechanism of lithium batteries under high cutoff voltage, and then presents an overview of the recent progress in the modification of high‐voltage lithium batteries using electrolyte modification strategies. Finally, the future direction of high‐voltage lithium battery electrolytes is also proposed.

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“…As known, HVLMBs are composed of four parts: highvoltage cathode, Li anode, separator, and electrolyte [19,20].…”

Section: Introductionmentioning

confidence: 99%

Electrolyte Engineering for High-Voltage Lithium Metal Batteries

et al. 2022

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High-voltage lithium metal batteries (HVLMBs) have been arguably regarded as the most prospective solution to ultrahigh-density energy storage devices beyond the reach of current technologies. Electrolyte, the only component inside the HVLMBs in contact with both aggressive cathode and Li anode, is expected to maintain stable electrode/electrolyte interfaces (EEIs) and facilitate reversible Li+ transference. Unfortunately, traditional electrolytes with narrow electrochemical windows fail to compromise the catalysis of high-voltage cathodes and infamous reactivity of the Li metal anode, which serves as a major contributor to detrimental electrochemical performance fading and thus impedes their practical applications. Developing stable electrolytes is vital for the further development of HVLMBs. However, optimization principles, design strategies, and future perspectives for the electrolytes of the HVLMBs have not been summarized in detail. This review first gives a systematical overview of recent progress in the improvement of traditional electrolytes and the design of novel electrolytes for the HVLMBs. Different strategies of conventional electrolyte modification, including high concentration electrolytes and CEI and SEI formation with additives, are covered. Novel electrolytes including fluorinated, ionic-liquid, sulfone, nitrile, and solid-state electrolytes are also outlined. In addition, theoretical studies and advanced characterization methods based on the electrolytes of the HVLMBs are probed to study the internal mechanism for ultrahigh stability at an extreme potential. It also foresees future research directions and perspectives for further development of electrolytes in the HVLMBs.

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Lithium Borate Ester Salts for Electrolyte Application in Next‐Generation High Voltage Lithium Batteries

Cited by 47 publications

References 51 publications

High-Performance Magnesium Electrochemical Cycling with Hybrid Mg–Li Electrolytes

High-Performance Magnesium Electrochemical Cycling with Hybrid Mg–Li Electrolytes

High‐Voltage Electrolyte Chemistry for Lithium Batteries

Electrolyte Engineering for High-Voltage Lithium Metal Batteries

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