409071-16-5

Basic information

• Product Name: Lithium difluoro(oxalato)borate(1-)
• Synonyms: LiDFOB;LiFBOB;Lithium difluoro(oxalato)borate;Lithium difluoro(oxalato)borate(1-);LithiuM Oxalyldifluoroborate;LithiuM difluoro oxalate borate;LIF2OB;LIFOB
• CAS NO: 409071-16-5
• Molecular Formula: C₂BF₂O₄*Li
• Molecular Weight: 143.7678064
• Mol File: 409071-16-5.mol

Chemical Properties

• Melting Point: 265-271°C
• Boiling Point: 275.3℃ at 102kPa
• Appearance: /
• Density: 2.01-2.065g/cm3 at 20℃
• Vapor Pressure: 0.003Pa at 20℃
• Storage Temp.: Inert atmosphere,Room Temperature
• Solubility: Water (Slightly)
• CAS DataBase Reference: Lithium difluoro(oxalato)borate(1-)(CAS DataBase Reference)
• NIST Chemistry Reference: Lithium difluoro(oxalato)borate(1-)(409071-16-5)
• EPA Substance Registry System: Lithium difluoro(oxalato)borate(1-)(409071-16-5)

Safety Data

• Hazard Codes: Xi
• Statements: 36/37/38
• Safety Statements: 26
• WGK Germany: 3
• Hazardous Substances Data: 409071-16-5(Hazardous Substances Data)

Usage

Appearance

White Solid

Uses

Different sources of media describe the Uses of 409071-16-5 differently. You can refer to the following data:
1. LiODFB is used as a thermally stable novel salt and an electrolytic additive for lithium-ion batteries. It facilitates the formation of stable solid electrolyte interphase (SEI) on the negative electrode during the fabrication of the cell. It substantially enhances the cyclic performance, capacity and power retention of the electrochemical system.
2. Lithium difluorooxalatoborate (LIODFB) is a salt for high-performance Li-ion batteries with improved cycle life; power capability; low temperature and high rate performance of the battery. Lithium difluorooxalatoborate can be used as a film-forming additive in the electrolyte of lithium batteries or replace lithium hexafluorophosphate as a conductive salt.

General Description

This product has been enhanced for energy efficiency.

Upstream product

• 144-62-7 oxalic acid 
• 18294-04-7 ethanedioic acid bis(trimethylsilyl)ester 
• 7637-07-2 boron trifluoride 
• 553-91-3 lithium oxalate 
• 1310-65-2 lithium hydroxide 
• 554-13-2 lithium carbonate 
• 7789-24-4 lithium fluoride 
• 244761-29-3 lithium bis[1,2-oxalato^(2-)-O,O'] borate 
• 109-63-7 boron trifluoride diethyl etherate 
• 79-37-8 oxalyl dichloride 
• 14720-33-3 fluoroboronic acid 
• 7664-39-3 hydrogen fluoride 
• 21324-40-3 lithium hexafluorophosphate 

Downstream Products

• 244761-29-3 lithium bis[1,2-oxalato^(2-)-O,O'] borate 

Relevant articles and documents

Characterisation and properties of new ionic liquids with the difluoromono[1,2-oxalato(2-)-O,O′]borate anion

Three ionic liquids with borate anions of low symmetry, tetraethylammonium difluoromono[1,2-oxalato(2-)-O,O′]borate, 1-ethyl-3-methylimidazolium difluoromono[1,2-oxalato(2-)-O,O′]borate, and 1-butyl-3-methylimidazolium difluoromono[1,2-oxalato(2-)-O,O′]borate were synthesised and characterised by physicochemical and electrochemical measurements including thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), cyclic voltammetry (CV), viscosity and conductivity measurements.

Method for purifying lithium difluoroborate and lithium tetrafluoroborate mixed lithium salt and application thereof

The invention belongs to the technical field of lithium ion battery manufacturing, and discloses a method for purifying lithium difluoroborate and lithium tetrafluoroborate mixed lithium salt and application thereof. According to the preparation method of the high-purity mixed lithium salt with different proportions, industrial-grade lithium oxalate is used as a raw material, the mixed lithium salt with different molar proportions of lithium difluoroborate and lithium tetrafluoroborate is prepared through the processes of synthesis, concentration, auxiliary purification filter membrane purification and the like, and the mixed lithium salt can adapt to various electrolyte formulas, is used for manufacturing lithium ion batteries, and the production cost is reduced; meanwhile, the method provided by the invention avoids the tedious process of recrystallization and the solid-liquid separation operation after crystallization in the prior art, can improve the yield and purity of the product, and simplifies the technological process.

Preparation method for difluoro(oxalato)borate

The invention relates to the technical field of preparation of electrolyte additives for lithium batteries, and in particular relates to a simple, convenient, economical and easily-industrial preparation method for difluoro(oxalato)borate. The preparation method comprises the following steps: mixing dialkyl silyl oxalate, MBF4 and a solvent, performing a reaction to prepare a crude product, and performing post-treatment to obtain the difluoro(oxalato)borate, wherein M is any one selected from the group consisting of Li, Na, K, Rb and CS. According to the preparation method, halogen ions and other metal ions are not introduced in the technological process, the reaction and purification process is simple and convenient, and the product quality is easy to control; the conversion rate of the target product is higher, the reaction product is single, and almost no by-products are generated; and almost no three waste (wastewater, waste gas and solid waste) is generated in the implementation process, and the generated recovered solvent and filtered mother liquor can be reused after being distillated.

Preparation method of lithium difluorooxalate borate

The invention discloses a preparation method of lithium difluorooxalate borate. The preparation method comprises the following steps: (1) placing anhydrous oxalic acid and anhydrous lithium chloride in a reaction vessel, adding an aprotic polar solvent to the reaction vessel under a nitrogen atmosphere, conducting reaction at 10-80 DEG C under a stirring condition for 1-12 h; reacting anhydrous oxalic acid with anhydrous lithium chloride to produce lithium hydrogen oxalate; (2) adding a boron trifluoride compound to the reaction vessel, continuing reaction for 1-12 h to produce lithium difluorooxalate borate; and (3) filtering a reaction solution after the reaction in step (2) at room temperature to remove solid raw materials which not completely react, and then concentrating and recrystallizing a filtrate obtained after filtration, then performing washing and filtration with a non-polar solvent, and finally, carrying out drying to obtain a solid lithium difluorooxalate borate product.The method is mild in reaction, simple in process, low in production cost, economical and environmentally friendly, can obtain high-purity lithium difluorooxalate borate, and is more suitable for industrial production.

Preparation method and purification method of compound comprising at least one cyclic ligand structure

The invention discloses a preparation method and a purification method of a compound comprising at least one cyclic ligand structure. The compound comprising the at least one cyclic ligand structure comprises 1-2 cyclic ligands in different structures, namely a cyclic ligand containing La and/or a cyclic ligand containing Lb, wherein the cyclic ligand containing La comprises one of sulfuryl (-SO2-), sulfinyl (-SO-) and carbonyl. The compound can serve as electrolyte lithium salt of a lithium ion battery independently, and is dissolved in an organic solvent for preparing an electrolyte solutionof the lithium ion battery; or, the compound and the lithium salt are dissolved in the organic solvent to prepare the electrolyte solution of the lithium ion battery; and the electrolyte solution canobviously improve internal resistance of the lithium ion battery and has an effect on cycle performance of the battery.

Preparation method of lithium difluoro(oxalato)borate

The invention provides a preparation method of lithium difluoro(oxalato)borate (Li[B(C2O4)F2], LiDFOB). The method effectively recycles the by-product LiBF4, and avoids the waste of lithium atoms while improving the yield. The method utilizes the solubility difference of materials to directly filter out the by-product, and is simple in operation. The crude product is subjected to crystallization directly to obtain high purity LiDFOB, thus avoiding the product loss brought about by repeated recrystallization. The method has the advantages of cheap and easily available materials, simple reactionsteps and mild reaction conditions, and is suitable for large-scale industrial production.

Method for synthesizing lithium difluorooxalate borate by one-pot method

The invention discloses a method for synthesizing lithium difluorooxalate borate by a one-pot method. The method is characterized by comprising the following steps: 1) preparation of lithium tetrafluoroborate: reacting lithium fluoride and boron trifluoride to prepare lithium tetrafluoroborate; 2) preparation of crude lithium difluorooxalate borate: reacting the obtained lithium tetrafluoroboratewith oxalic acid to obtain the crude lithium difluorooxalate borate; 3) preparation of electronic grade difluorooxalate borate: recrystallizing the crude lithium difluorooxalate borate by an organic solvent, washing and drying to obtain the electronic grade lithium difluorooxalate borate. The method for synthesizing the lithium difluorooxalate borate by the one-pot method has the beneficial effects that crystal obtained by the method disclosed by the invention has higher quality, the content is greater than 99.8%, and no sulfate ion exists.

Catalytic synthesis method of lithium difluoro(oxalato)borate

The invention relates to a catalytic synthesis method of lithium difluoro(oxalato)borate, belonging to the technical fields of new energy material preparation and chemical industry. The method comprises the following steps: (1) after all production reaction vessels are replaced with high-purity nitrogen, adding materials in a high-purity nitrogen protective atmosphere; (2) in a closed dry reactor, adding a certain amount of dry waterless lithium oxalate and a certain amount of boron trifluoride complex into an organic solvent reactor, and dissolving to prepare a solution; (3) adding a certain amount of catalyst, and sufficiently reacting at specified temperature to obtain a lithium difluoro(oxalato)borate-lithium tetrafluoroborate mixed solution; (4) adding a certain amount of waterless oxalic acid into the lithium difluoro(oxalato)borate-lithium tetrafluoroborate mixed solution, and sufficiently reacting under the control of specified temperature, specified pressure and a tail gas absorption solution, thereby obtaining the lithium difluoro(oxalato)borate solution. The catalytic synthesis method of lithium difluoro(oxalato)borate has the advantages of short reaction time, high product yield, low equipment investment, no pollution and wide application prospects, and is simple to operate.

Process for synthesizing lithium difluoro(oxalate)borate from lithium bis(oxalate)borate

The invention discloses a process for synthesizing lithium difluoro(oxalate)borate from lithium bis(oxalate)borate. The process comprises the following steps: mixing lithium bis(oxalate)borate with a compound containing fluorine, boron and lithium; carrying out a reaction in a solvent system at a temperature of 0 to 150 DEG C and a reaction pressure of 101 kpa and 150 kpa to produce a product; and carrying out a reaction at a certain temperature and then carrying out crystallization and vacuum drying so as to obtain battery-grade lithium difluoro(oxalate)borate. The process provided by the invention is novel in process and mild in conditions and can prepare high-purity battery-grade lithium difluoro(oxalate)borate.

A oxalate two fluorine lithium borate electrolyte salt preparation method

The invention provides a preparation method of a high-purity lithium difluorooxalatoborate (LiODFB) electrolyte for a lithium ion battery. The preparation method comprises the following steps of firstly adding lithium oxalate and boron trifluoride diethyl ether according to a molar ratio being (1: 1) to (1: 3) into a dried ball-milling tank, carrying out ball-milling at a temperature of 30 DEG C-90 DEG C for 2 hours-24 hours; and then dissolving the ball-milled reaction product in an organic solvent at the temperature of 30-90 DEG C and filtering to remove a solid-phase byproduct and unreacted lithium oxalate to obtain a solution containing LiODFB, crystallizing at a low temperature of -20 DEG C to 10 DEG C to obtain LiODFB crystals and carrying out vacuum drying on the LiODFB crystals at 40 DEG C-100 DEG C for 10 hours-48 hours to obtain the purified LiODFB solid. The preparation method has the advantages of no strict requirements, such as high temperature resistance and high pressure resistance, simple operation and low investment in equipment and has very broad application prospects, and the product of which the purity is above 99.9% can be directly obtained by adopting the preparation method.