Fluorine battery additives

CAS:156783-95-8，Methyl 2,2,2-trifluoroethyl carbonate，（FEMC）

Specification：99%
Properties：Liquid
Package：fluorinated bottle
Usage：Lithium battery additives
Product description: CAS:156783-95-8 | Methyl trifluoroethyl carbonate, lithium battery additive to improve cycleability and safety, and increase the ignition point of electrolyte
INQUIRY

Basic indicators:

1. Purity: 99%+ (detection method GC)

2. Moisture: ≤50ppm (Karl Fischer method)

Carbonic acid, Methyl 2,2,2-trifluoroethyl ester Basic information

Product Name:	Carbonic acid, Methyl 2,2,2-trifluoroethyl ester
Synonyms:	Carbonic acid, Methyl 2,2,2-trifluoroethyl ester ;2,2,2-trifluoroethyl Methyl carbonate;Methyl2,2,2-trifluoroethylcarbonate;Methyl 2,2,2-trifluoroethyl carbonate 97%;Methyl trifluoroethylene carbonate;Methyl trifluoroethyl carbonate
CAS:	156783-95-8
MF:	C4H5F3O3
MW:	158.08
EINECS:	694-997-5
Product Categories:
Mol File:	156783-95-8.mol

Carbonic acid, Methyl 2,2,2-trifluoroethyl ester Chemical Properties

Boiling point	74.2±40.0 °C(Predicted)
density	1.308g/ml

Safety Information

Information

Atlanta, GA., July, 2019 — F3-EMC, or Trifluoroethyl methyl carbonate (Methyl-2,2,2-trifluoroethyl carbonate; 2,2,2-Trifluoroethyl methyl carbonate; FEMC; 3FEMC; or TFEMC, CAS #156783-95-8) for use in Lithium Ion (Li-Ion) batteries. This new product is a linear, partially fluorinated carbonate that serves as a co-solvent to improve the performance of Li-Ion batteries.

F3-EMC contains three fluorine atoms, which offer improved oxidative stability for electrolytes. This stability enables protection against degradation when electrolytes are stressed to higher voltage and temperature. As F3-EMC is miscible with commonly-used carbonates like DMC, EMC, EC, and FEC, this co-solvent allows manufacturers to achieve higher-performance batteries through minor formulation changes to conventional electrolyte systems.

Electrolytes for Li-Ion batteries formulated with F3-EMC offer better cycle life with both graphite and silicon-graphite composite anodes to enable higher energy density. In addition to improved capacity retention, fluorinated carbonates such as F3-EMC contribute to longer lasting SEI layers on the anode.

Increased energy density is integral to providing battery solutions that meet the demands for portable energy in the markets of the future, including applications in consumer electronics, automotive, defense, and aerospace. Higher-performance Li-Ion batteries allow for smaller, longer-lasting wearable devices, more efficient battery-powered vehicles, and battery-powered commercial air travel.

“Additionally, we are developing novel fluorinated electrolyte additives that build on F3-EMC’s features and benefits, while considering the scalability and supply to a broad base of battery companies. F3-EMC is just the beginning.”

Recent advances in multifunctional generalized local high-concentration electrolytes for high-efficiency alkali metal batteries

Yuan, Zeyu; Chen, Anni; Liao, Jiaying; Song, Lili; Zhou, Xiaosi [Nano Energy, 2024, vol. 119, art. no. 109088]

Abstract

Alkali metal batteries (AMB, A=Li, Na, K) are considered to be the most promising energy storage devices to achieve high energy density. As the blood of the battery, to realize stable energy storage in high-energy-density alkali metal batteries, the electrolyte needs to be properly designed. Over the past three decades, electrolytes have evolved from regular concentration electrolytes, ionic liquid electrolytes, and high-concentration electrolytes to localized ionic liquid electrolytes, localized high-concentration electrolytes, and quasi-localized high-concentration electrolytes. Due to the wide variety of alkali metal battery electrolytes, this review first proposes the concept of generalized local high-concentration electrolyte (g-LHCE) based on the characteristics of the solvation structure, supplements the descriptor values of different solvents, and summarizes the design principles of g-LHCE. Then the progress of g-LHCE in recent years in terms of high voltage, solid-liquid interface, low temperature, and nonflammability is summarized. Finally, the future development of g-LHCE is prospected. High-entropy generalized local high-concentration electrolytes and local high-concentration aqueous electrolytes will become important research directions for advanced electrolyte design in the field of high energy density and high power density alkali metal batteries.

Juggling Formation of HF and LiF to Reduce Crossover Effects in Carbonate Electrolyte with Fluorinated Cosolvents for High-Voltage Lithium Metal Batteries

Zhang, Han; Zeng, Ziqi; Ma, Fenfen; Wang, Xinlan; Wu, Yuanke; Liu, Mengchuang; He, Renjie; Cheng, Shijie; Xie, Jia [Advanced Functional Materials, 2023, vol. 33, # 4, art. no. 2212000]

Abstract

Fluorinated solvents emerge as a promising strategy to improve performance of lithium metal batteries (LMBs). However, most of them are prone to produce corrosive HF and deteriorate electrode interface, inducing cathode-to-anode detrimental crossover of transition metal-ions. Here, fluorinated aromatic hydrocarbons in dimethyl carbonate (DMC)-based diluted highly concentrated electrolyte (DHCE) are employed to juggle formation of HF and LiF, enabling stable cycling of high-voltage LiNi0.7Co0.1Mn0.2O2 (NCM712) and LiCoO2 (LCO). The nature of aromatics in this carbonate-based DHCE makes them difficult to undergo β-hydrogen assisted defluorination, evidencing by the high energy barrier and high bond energy of β-sites hydrogen. The advanced DHCE restrains HF formation but strengthens LiF formation, which not only suppresses impedance growth, transition-metal dissolution, and stress crack on the cathode, but achieves highly reversible Li stripping/plating with an outstanding average Coulombic efficiency up to 99.3%. The Li||NCM712 cell and Li||LCO cell both exhibits superior cycling stability at high operation voltage. Even under stringent conditions, the 4.4 V Li||NCM712 full battery retains >95% of the initial capacity over 100 cycles, advancing practical high-voltage LMBs. This study designs an efficient electrolyte that generates robust electrode/electrolyte interphases and restrains by-products formation spontaneously, thus shedding new light on electrolyte toward applicable LMBs.

An electrochemical evaluation of state-of-the-art non-flammable liquid electrolytes for high-voltage lithium-ion batteries

Gebert, Florian; Longhini, Matilde; Conti, Fosca; Naylor, Andrew J. [Journal of Power Sources, 2023, vol. 556, art. no. 232412]

Abstract

The rapid and accelerating adoption of lithium-ion batteries worldwide, especially in the transportation sector, has focused attention on their safety. One area of particular interest is finding alternatives for their most flammable component, the liquid electrolyte. Over the past 20 years, a number of non-flammable liquid electrolytes have been identified and tested. However, because these data are frequently obtained under a wide range of conditions – e.g., different active materials, current densities or voltage cutoffs – it is difficult to compare them. In this work, eight promising non-flammable liquid electrolytes – four phosphate derivatives and four based on fluorinated hydrocarbons – are identified from the literature and tested in commercially relevant high-voltage systems under identical conditions. The electrochemical stabilities of the electrolytes were studied against both inert electrodes and in LiNi0.6Mn0.2Co0.2O2|graphite cells. Each electrolyte was assessed via long-term cycling experiments and rate-testing and the cell resistance during aging was monitored. It was found that the electrolytes containing phosphate and phosphonate-based solvents generally performed very poorly compared to the phosphorus-free fluorinated solvents; the latter resulted, on average, in twice the capacity retention after 500 cycles of the former. A strong correlation was observed between long-term cycling performance, rate capability and the cell resistance.

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