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935832

Sigma-Aldrich

Lithium bis(fluorosulfonyl)imide

greener alternative

99.9% trace metals basis, battery grade

Synonym(s):

"Imidodisulfuryl fluoride, lithium salt", Ionel LF 101, LiFSI, Lithium bis(fluorosulfonyl)amide, Lithium bis(fluorosulfonyl)imido, Lithium imidodisulfuryl fluoride

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About This Item

Empirical Formula (Hill Notation):
F2LiNO4S2
CAS Number:
Molecular Weight:
187.07
UNSPSC Code:
12352104
NACRES:
NA.21

grade

battery grade

Quality Level

description

Application: Battery manufacturing

Assay

99.9% trace metals basis

form

powder

greener alternative product characteristics

Design for Energy Efficiency
Learn more about the Principles of Green Chemistry.

sustainability

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mp

140 °C

anion traces

chloride (Cl-): ≤5 ppm
sulfate (SO42-): ≤10 ppm

cation traces

K: ≤10 ppm
Na: ≤5 ppm

application(s)

battery manufacturing

greener alternative category

SMILES string

FS([N-]S(F)(=O)=O)(=O)=O.[Li+]

InChI

1S/F2NO4S2.Li/c1-8(4,5)3-9(2,6)7;/q-1;+1

InChI key

VDVLPSWVDYJFRW-UHFFFAOYSA-N

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General description

Battery grade lithium bis(fluorosulfonyl)imide (LiFSI) is a white, powdery lithium salt often used as the source of lithium in high-performance electrolytes for lithium-ion batteries. LiFSI is soluble in water and many organics including the carbonates and ethers typically used in liquid electrolytes, like ethylene carbonate or dimethyl carbonate. Our battery grade LiFSI is differentiated by its high purity with low impurities of sodium, potassium, chloride, and sulfate, and low moisture content.
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Application

Battery grade LiFSI is used as the source of lithium ions in battery electrolytes for LiBs. In comparison to LiPF6, LiFSI has marked advantages including a higher ionic conductivity in organic solvents and improved thermal stability. In addition, LiFSI has advantages in better stability against hydrolysis, lower aluminum corrosion with stability up to 4.7 V, higher transference number, and generally higher columbic efficiency for Li metal anode cycling.[3] Because of these advantages, many of the groundbreaking works to improve electrolytes use LiFSI. For example, researchers leveraged the improved solubility of LiFSI in ethers compared to LiTFSI or LiPF6 to formulate a LiFSI-based electrolyte that operates even at ultra-low temperatures like -30 °C, demonstrate cathodic stability up to 6 V vs Li/Li+, and achieve fast cycling with high columbic efficiency LiFSi is also commonly used as a co-salt with LiPF6 to improve the performance at high operating temperatures, for example 0.6 M LiFSI and 0.6 M LiPF6 in carbonate blends Researchers also often use LiFSI or a blend of LiFSI and LiTFSI as the source of lithium ions in polymer electrolytes, especially with Li metal anodes. LiFSI is shown to produce a LiF-rich solid-electrolyte interphase on Li metal surfaces, which promotes cycling with high coulombic efficiencies

Signal Word

Danger

Hazard Statements

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Muta. 2 - Skin Irrit. 2

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


Certificates of Analysis (COA)

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Ultra-high-voltage Ni-rich layered cathodes in practical Li metal batteries enabled by a sulfonamide-based electrolyte
Xue W, et al.
Nature Energy, 6, 495-505 (2021)
Fast charging of energy-dense lithium-ion batteries
Wang C Y, et al.
Nature, 611, 485-490 (2022)
Rational solvent molecule tuning for high-performance lithium metal battery electrolytes
Yu Z, et al.
Nature Energy, 7, 94-106 (2022)
Tailoring electrolyte solvation for Li metal batteries cycled at ultra-low temperature
Holoubek J, et al.
Nature Energy, 6, 303-313 (2021)
Enabling fast charging of high energy density Li-ion cells with high lithium ion transport electrolytes
Du Z, et al.
Electrochemistry Communications, 103, 109-113 (2019)

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