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The opportunities brought by the development of hexanitriles

2016-07-19 来源:亚科官网

  1,3,6-hexanetriazole, light yellow liquid, boiling point 255-260℃/2mmHg (lit.), Refractive index: n20/D 1.466 (lit.), is mainly used as organic synthesis intermediates, high boiling solvent, Electrolyte additives. The composition of the electrolyte limits the use of positive and negative materials in high voltage batteries. Traditional organic carbonate solvents such as chain carbonates DEC, DMC, EMC, and cyclic carbonates PC, EC, etc., will decompose under high voltage. Therefore, the development of new organic solvents with a wide electrochemical window, high lithium salt solubility and low toxicity become one of the key to the development of high voltage electrolyte.
 
1. History
 
  Initially, like many other chemical reagents, 1,3,6-hexanetriacetonitrile is a by-product of adiponitrile, and treated as a chemical waste. In 1960, the United States Monsanto company developed production process of adiponitrile for industry, then the Japanese Asahi Kasei company developed emulsification system to get hexanediyl nitrile, the by-product of which is hexanetriazole. Since the application of hexanenitriles was not studied at that time, hexane trionitrile was only treated as waste.
With the progress and development of science and technology, chemical synthesis developed rapidly in the 21st century, the original useless hexanetriazole was found to be used to synthesize many industrial products. Especially in recent years, new energy research makes that more and more people are shifted to the development of the battery, and nitrile as electrolyte additives have begun to be studied, this time, hexanetrionitrile also received considerable attention with its special structure.
 
2. The application of hexanetriazole
 
  Nitrile organic solvents usually have a wide electrochemical window, high anode stability, low viscosity and high boiling point and other excellent properties. In addition, the decomposition products of nitrile-containing organic solvent are generally carboxylate, aldehyde or the corresponding organic amine, it would not have highly toxic CN-ion generation [5~7]. Nitrile solvents have been more promising new organic solvents. However, from the electrochemical performance of lithium-ion batteries, nitrile solvents still have a problem of compatible with the negative electrode, mixing with carbonate solvent to form a blending system or adding LiBOB can improve this problem to a certain extent.
 
  Now, 1,3,6-hexanetrionitrile has become an important intermediate for many industrial applications. For example, tricarboxyl groups which can be used as detergents can be obtained by hydrolysis. The corresponding hydrogenation of the trionitrile produces 1,3,6-triaminohexane, which can be phosgenated in the other step to form 1,3,6-triisocyanates, which are used as important basic structural units in polyurethane (PU) chemistry, for example, in the preparation of polyurethane adhesives or polyurethane coatings. On the other hand, due to the advantages of stability, electrolyte additives are also considered with 1,3,6-hexanetriazole and other nitrile substances instead of the original adiponitrile, in order to make the battery performance better.
 
  At present, most of the domestic lithium-ion battery using LiPF6-EC/EMC/DEC as the main electrolyte system, supplemented by a small amount of ethylene carbonate, propylene sulfide and other additives. This kind of electrolyte has excellent cycle performance and high temperature storage performance under low voltage. However, in the high voltage and high density lithium ion battery system, the cycle and high temperature storage are not ideal, infiltration performance is also poor. So it is urgent to further optimization the existing electrolyte, so that it can match the high voltage and high density lithium-ion battery system.
 
  1,3,6-hexanetriazole has a great advantage in high-temperature storage and recycling performance in applications of high-voltage lithium battery electrolyte, but due to synthetic technology, supply and other problems, the current application of its research is relatively less, but with the high requirements of high-temperature safety performance on the lithium-ion battery, we believe in the near future, it will have extremely broad market.
 
  The following table is part of the quality inspection instructions for hexanetriazole of Suzhou Yacoo Science Co., Ltd.

 
SPECIFICATION  PROPERTIES
STANDARD
Appearance
Colorless to light yellow liquid
Assay,%
≥99.0
Chromaticity,APHA
≤200
(25%DMC)
Chromaticity,APHA
≤60
Water content,ppm
≤100

  With the development of research, the industrial requirements for the safety of lithium batteries are also constantly improved, butadiene-nitrile as a representative of the stabilizer will no longer meet the development needs of lithium batteries, and will be replaced by stronger stabilizers like hexanitriles.
 
 

Edited by Suzhou Yacoo Science Co., Ltd.