Method for low-cost preparation of high-purity fixed-proportion mixed lithium salt, and application of mixed lithium salt to lithium ion battery

A lithium ion battery and mixed lithium salt technology, applied in secondary batteries, carboxylate preparation, chemical instruments and methods, etc., can solve the problem of increasing the cost of mixed salt electrolyte, high equipment and technical requirements, and difficulty in separating the two It can improve the cycle performance at room temperature and high temperature, reduce the cost, and simplify the production process.

Active Publication Date: 2019-10-18
新亚杉杉新材料科技(衢州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the existing process, the similar structure of lithium tetrafluoroborate and lithium difluorooxalate borate and the high temperature of the two solutions make it difficult to separate the two, which requires high equipment and technology, and the production of the two The purity of mixed salt is low, these factors greatly increase the cost of mixed salt electrolyte

Method used

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  • Method for low-cost preparation of high-purity fixed-proportion mixed lithium salt, and application of mixed lithium salt to lithium ion battery
  • Method for low-cost preparation of high-purity fixed-proportion mixed lithium salt, and application of mixed lithium salt to lithium ion battery
  • Method for low-cost preparation of high-purity fixed-proportion mixed lithium salt, and application of mixed lithium salt to lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Purification of lithium oxalate

[0064] Weigh 150g of industrial-grade lithium oxalate, add an appropriate amount of ultrapure water, and stir to prepare a suspension; weigh 0.4 g of ethylenediaminetetraacetic acid (EDTA), and dissolve it in a small amount of ultrapure water; add EDTA aqueous solution to oxalic acid In the lithium suspension, after stirring for 30 minutes, the lithium oxalate solid was obtained by suction filtration; the lithium oxalate solid was cleaned with ultrapure water and suction filtered, and this was repeated 3 times, and finally cleaned with ethanol, suction filtered, and placed in an oven at 120°C After drying, the obtained white powder is the purified lithium oxalate solid (96%).

[0065] (2) Preparation of auxiliary purification filter membrane

[0066] Ethanol, polyethylene glycol diacrylate, 1,1'-(methylenebis-4,1-phenylene)bis[2-hydroxy-2-methyl-1-propanone], trifluoromethyl Scandium sulfonate, dimethyl 2-(3-nitro-2-pyridine) malo...

Embodiment 2

[0072] (1) Preparation of auxiliary purification filter membrane

[0073] Ethanol, polyethylene glycol diacrylate, 1,1'-(methylenebis-4,1-phenylene)bis[2-hydroxy-2-methyl-1-propanone], trifluoromethyl Scandium sulfonate, dimethyl 2-(3-nitro-2-pyridine) malonate, and potassium benzofuran-2-trifluoroborate were added to the reaction in a ratio of 100:125:7:0.2:0.25:0.35 In the container, stir at a constant temperature of 80°C with nitrogen for 120 minutes, pour the mixture on a glass plate, and then cover the quartz glass plate on the top of the mixture, control the thickness of the mixture to 200 μm, irradiate with ultraviolet light for 120s, wash with acetone for 20 hours, and stand to dry to obtain The described auxiliary purification filter membrane.

[0074] (2) Synthesis of mixed lithium salts

[0075] Add 500 mL of ethyl acetate (EA) to the three-necked reaction flask, and add 102 g of lithium oxalate under vigorous stirring. Raise the temperature to 85°C and stir for ...

Embodiment 3

[0079] (1) Preparation of auxiliary purification filter membrane

[0080] Ethanol, polyethylene glycol diacrylate, 1,1'-(methylenebis-4,1-phenylene)bis[2-hydroxy-2-methyl-1-propanone], trifluoromethyl Scandium sulfonate, dimethyl 2-(3-nitro-2-pyridine) malonate, and potassium benzofuran-2-trifluoroborate were added to the reaction in a ratio of 100:150:10:0.3:0.4:0.5 In the container, stir at a constant temperature of 78°C with nitrogen for 150 minutes, pour the mixture on a glass plate, and then cover the quartz glass plate on the top of the mixture, control the thickness of the mixture to 300 μm, irradiate with ultraviolet rays for 120s, wash with acetone for 24 hours, and stand to dry to obtain The described auxiliary purification filter membrane.

[0081] (2) Synthesis of mixed lithium salts

[0082] Add 500 mL of acetonitrile into the three-neck reaction flask, and add 102 g of lithium oxalate under vigorous stirring. Raise the temperature to 85°C and stir for 1 h to p...

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Abstract

The invention discloses a method for low-cost preparation of fixed-proportion mixed lithium salt. The method comprises the following steps: (1) lithium oxalate is purified; (2) the lithium oxalate andboron trifluoride.etherate react to prepare the 1:1 fixed-proportion mixed lithium salt of LiODFB and LiBF4; and (3) the fixed-proportion mixed lithium salt is purified. The product yield and purityare increased, and the technological process is simplified.

Description

technical field [0001] The invention relates to a low-cost method for preparing a mixed lithium salt for lithium-ion batteries and the application of the mixed lithium salt in lithium-ion batteries, in particular to a lithium difluorooxalate borate and lithium tetrafluoroborate molar ratio of 1:1 A method for preparing a high-purity mixed lithium salt, and the improvement of the performance of the lithium-ion battery by the mixed lithium salt. Background technique [0002] Lithium battery electrolyte is the carrier of ion transport in the battery. Generally composed of lithium salt and organic solvent. The electrolyte plays the role of conducting ions between the positive and negative electrodes of the lithium battery, which is the guarantee for the high voltage and high specific energy of the lithium ion battery. The electrolyte is generally prepared from high-purity organic solvents, electrolyte lithium salts, necessary additives and other raw materials under certain con...

Claims

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Application Information

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IPC IPC(8): C07F5/02B01D71/76B01D67/00H01M10/0567H01M10/0525
CPCB01D67/0006B01D71/76B01D2323/345C07F5/022H01M10/0525H01M10/0567Y02E60/10C01B35/066C07C51/41C07C51/42C07C55/07C07F5/025
Inventor 杜建委杨冰钟子坊周彤曹青青吴杰
Owner 新亚杉杉新材料科技(衢州)有限公司
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