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Preparation method of high-performance lithium salt

A high-performance, lithium salt technology, which is applied in the field of high-performance lithium salts and perfluorinated alkyl-substituted high-performance lithium salts, high-performance lithium salts, can solve problems such as poor thermal stability of carbonate electrolytes, and achieve improved Electrochemical performance, reaction process control, high purity effect

Inactive Publication Date: 2018-05-04
SHIJIAZHUANG SAN TAI CHEM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Given LPiPF 6 / The problem of poor thermal stability of carbonate electrolyte, people have tried to use a new type of electrolyte lithium salt to replace LiPF 6 used as a supporting electrolyte
[0006] Lithium salts with N as the central atom such as lithium bis(trifluoromethylsulfonyl)imide [LiN(CF 3 SO 2 ) 2 , referred to as LiTFSI] and its derivatives lithium bis(pentafluoroethylsulfonyl)imide [LiN(SO 2 C 2 f 5 ) 2 , referred to as LiBETI] is one of the more popular organolithium salts studied in recent years. This type of salt is easily dissociated in the organic electrolyte, and its conductivity is comparable to that of LiPF 6 Quite up to 10 -4 S / cm can also form a uniform passivation film on the surface of the negative electrode, and the thermal stability is also significantly improved, but this type of salt also has the problem of corroding the aluminum foil current collector.

Method used

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  • Preparation method of high-performance lithium salt
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  • Preparation method of high-performance lithium salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: the preparation of ethylene sulfonylimide lithium salt, structural formula is

[0038] React 1mol of dibromoethane with 2.1mol of sodium sulfite at 100°C to get Then add phosphorus trichloride to the obtained product and react at 150°C. The amount of phosphorus trichloride is added according to the chemical molar amount in the chemical reaction formula, preferably in excess of 0.1-0.3%, to obtain ethylenesulfonyl chloride

[0039] Reaction of vinylsulfonyl chloride obtained above with potassium fluoride at 50°C to obtain vinylsulfonyl fluoride Wherein the mol ratio of vinylsulfonyl chloride and potassium fluoride is 1:1;

[0040] Introduce ammonia gas into the ethylene sulfonyl fluoride obtained above for bubbling, then add diethyl ether, and react at 10°C to obtain ethylene sulfonamide Wherein the molar ratio of ethylenesulfonyl fluoride to ammonia is 1:2.1;

[0041] The ethylene sulfonamide obtained above was added to lithium hydroxide and reac...

Embodiment 2

[0045] Example 2: Lithium salt of 1,3-propane disulfonylimide CAS No. 1034120-61-0

[0046] React 1mol of dibromopropane with 2.3mol of sodium sulfite at 120°C to obtain Then add phosphorus trichloride to the obtained product and react at 160°C. The amount of phosphorus trichloride is added according to the chemical molar amount in the chemical reaction formula, preferably in excess of 0.1-0.3%, to obtain 1,3-propanedi Sulfonyl chloride

[0047] React the 1,3-propanedisulfonyl chloride obtained above with potassium fluoride at 60°C to obtain 1,3-propanedisulfonyl fluoride Wherein the molar ratio of 1,3-propanedisulfonyl chloride to potassium fluoride is 1:1.5;

[0048] Bubble ammonia gas into the 1,3-propanedisulfonyl fluoride obtained above, then add ether, and react at 5°C to obtain 1,3-propanedisulfonamide Wherein the molar ratio of 1,3-propanedisulfonyl fluoride to ammonia is 1:2.3;

[0049] Add the above-mentioned product 1,3-propanedisulfonamide to lithium hydro...

Embodiment 3

[0053] Example 3: Lithium salt of perfluoro-substituted 1,3-propane disulfonylimide

[0054] React 1mol of dibromopropane with 2.2mol of sodium sulfite at 115°C to obtain Then add phosphorus trichloride to the obtained product and react at 155°C. The amount of phosphorus trichloride is added according to the chemical molar amount in the chemical reaction formula, preferably in excess of 0.1-0.3%, to obtain 1,3-propanedi Sulfonyl chloride

[0055] React the 1,3-propanedisulfonyl chloride obtained above with potassium fluoride at 55°C to obtain 1,3-propanedisulfonyl fluoride Wherein the molar ratio of 1,3-propanedisulfonyl chloride to potassium fluoride is 1:1.3;

[0056] Bubble ammonia gas into the 1,3-propanedisulfonyl fluoride obtained above, then add diethyl ether, and react at 8°C to obtain 1,3-propanedisulfonamide Wherein the molar ratio of 1,3-propanedisulfonyl fluoride to ammonia is 1:2.2;

[0057] Add the above product 1,3-propanedisulfonamide to lithium hydr...

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Abstract

The invention provides a preparation method of high-performance lithium salt, and belongs to the technical field of lithium salt for a battery. The preparation method comprises the following steps ofA, using vinyl sulfonyl fluoride or 1,3-propane bi-sulfonyl fluoride as the raw material, leading ammonia gas to bubble, adding diethyl ether, and acting at the temperature of 5 to 10 DEG C, so as toobtain sulfonyl amide or 1,3-propane bisulfonyl amide; B, adding the product obtained in step A into lithium hydroxide, and reacting at the temperature of 50 to 60 DEG C, so as to obtain the high-performance lithium salt, wherein the high-performance lithium salt contains the high-performance lithium salt and the high-performance lithium salt with substituted perfluoroalkyl. The preparation methodhas the advantages that the preparation method is simple; a wholly novel preparation method for the lithium salt of the battery is provided; the yield rate of the product is high, the purity is high,and the property is good after the high-performance lithium salt is applied to the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium salts for batteries, and relates to high-performance lithium imides, in particular to a preparation method of high-performance lithium salts, including high-performance lithium salts and high-performance lithium salts with perfluorinated alkyl groups. The preparation method of the invention is simple, and provides a brand-new preparation method of lithium salt used in batteries. The product obtained by the preparation method has high yield and high purity. Background technique [0002] Lithium-ion batteries are secondary batteries with the highest specific energy so far, and have been widely used as power sources for portable electronic devices, such as mobile phones, digital cameras, and notebook computers. At present, commercial lithium-ion battery products generally use carbonate or ether organic solvents as the electrolyte solvent system, LiPF 6 as a conductive lithium salt. However, at high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D285/01C07D285/15H01M10/0525H01M10/0568
CPCC07D285/01C07D285/15H01M10/0525H01M10/0568Y02E60/10
Inventor 葛建民刘鹏武利斌
Owner SHIJIAZHUANG SAN TAI CHEM CO LTD
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